ОТВОД АЗОТА ИЗ КОНДЕНСИРОВАННОГО ПРИРОДНОГО ГАЗА

Изобретение может быть использовано в технологии обработки природного газа. Способ отвода азота включает введение конденсированного природного газа в первом положении дистилляционной колонны, отбор обогащенного азотом потока пара из головной части дистилляционной колонны и отбор очищенного потока сжиженного природного газа из нижней части колонны. Поток холодного орошения вводят в дистилляционную колонну во втором положении, находящемся выше первого положения. Способ также включает либо охлаждение очищенного потока сжиженного природного газа, или охлаждение потока конденсированного природного газа, либо охлаждение как очищенного потока сжиженного природного газа, так и потока конденсированного природного газа. Технический результат: удаление азота с минимальными потерями метана и обеспечение принудительного охлаждения сжиженного природного газа. 5 н. и 28 з.п. ф-лы, 8 ил.

СПОСОБ УДАЛЕНИЯ ЛЕТУЧИХ КОМПОНЕНТОВ ИЗ ПРИРОДНОГО ГАЗА

Раскрыт способ удаления, по меньшей мере, одного компонента, обладающего высокой летучестью, такого как азот, из природного газа под давлением для получения сжиженного природного газа под давлением, который имеет низкое содержание азота и температуру свыше приблизительно -112oС (-170oF). Исходный природный газ под давлением, содержащий азот, расширяют и подают во фракционирующую ректификационную колонну. Во фракционирующей ректификационной колонне образуется поток первого пара, который имеет повышенное содержание азота, и поток первой жидкости. Поток пара охлаждают для образования паровой фазы и жидкой фазы. После этого паровую и жидкую фазы подвергают разделению фаз для образования потока второго пара и потока второй жидкости. Поток второй жидкости возвращают во фракционирующую ректификационную колонну в качестве флегмы. Поток второго пара предпочтительно используют для охлаждения поступающего потока исходного сырья. Поток первой жидкости отводят из установки для фракционирования в качестве ...

УДАЛЕНИЕ АЗОТА ИЗ ПРИРОДНОГО ГАЗА

Изобретение относится к способу разложения азотосодержащей исходной фракции с высоким содержанием углеводородов, предпочтительно природного газа, при этом: исходную фракцию частично сжижают и методом ректификации разделяют на обогащенную азотом фракцию и обедненную азотом фракцию с высоким содержанием углеводородов. В верхней зоне ректификации обогащенный азотом поток отводят, охлаждают и частично подают на ректификацию в качестве возвратного продукта и/или обогащенную азотом фракцию охлаждают и частично конденсируют, частично подают на ректификацию в качестве возвратного продукта и остаточный поток обогащенной азотом фракции подвергают процессу в двух колоннах. В средней зоне ректификации поток с низким содержанием двуокиси углерода, который используют для охлаждения обогащенного азотом частичного потока и/или охлаждения обогащенной азотом фракции, отводят. Ректификацию исходной фракции осуществляют в снабженной разделительной перегородкой разделительной колонне, при этом разделительная ...

СПОСОБ ОБРАТНОГО СЖИЖЕНИЯ БОГАТОЙ МЕТАНОМ ФРАКЦИИ

Заявлен способ обратного сжижения богатой метаном фракции, в частности испаренного газа. При этом богатую метаном фракцию сжимают до давления, которое по меньшей мере на 20% превышает критическое давление подлежащей сжатию фракции, сжижают и переохлаждают. Далее разгружают до давления между 5 и 20 бар и разделяют на газообразную богатую азотом фракцию и жидкую обедненную азотом фракцию. Обедненную азотом фракцию разгружают до давления между 1,1 и 2,0 бар, при этом получающуюся газообразную фракцию без нагревания и сжатия подмешивают в богатую метаном фракцию. Получающаяся при разгрузке бедная азотом жидкая фракция продукта имеет содержание азота ≤1,5 мол.%. 4 з.п. ф-лы, 1 ил.

СПОСОБ ПОЛУЧЕНИЯ БИОМЕТАНА ПУТЕМ ОЧИСТКИ БИОГАЗА ИЗ ХРАНИЛИЩ НЕОПАСНЫХ ОТХОДОВ И УСТАНОВКА ДЛЯ ОСУЩЕСТВЛЕНИЯ СПОСОБА

Изобретение относится к способу получения биометана путем очистки биогаза из хранилищ неопасных отходов (NHWSF) и к установке для осуществления такого способа. Способ получения биометана путем очистки биогаза из хранилищ неопасных отходов включает сжатие начального газового потока, введение потока газа, подлежащего очистке, по меньшей мере в один адсорбер, заполненный адсорбентами, способными к обратимой адсорбции VOC. Включает подвергание обедненного по VOC газового потока, выходящего из адсорбера, по меньшей мере одному этапу мембранного разделения с целью частичного отделения COи Oот газового потока. Далее следует введение ретентата, полученного на этапе мембранного разделения по меньшей мере в один адсорбер, заполненный адсорбентами, способными к обратимой адсорбции большей части оставшегося CO. Подвергание обедненного по COгазового потока, выходящего из адсорбера, заполненного адсорбентами, способными к обратимой адсорбции большей части оставшегося CO, этапу криогенного разделения ...

СПОСОБ УДАЛЕНИЯ АЗОТА

Изобретение относится к способу удаления фракции с высоким содержанием азота из исходной фракции, содержащей в основном азот и углеводороды. Исходная фракция частично конденсируется и ректификационным методом разделяется на фракцию с высоким содержанием азота и фракцию с высоким содержанием метана. В соответствии с изобретением во время прерывания подачи исходной фракции применяемая (применяемые) для ректификационного разделения разделительная колонна (разделительные колонны) (T1/T2), а также служащие для частичной конденсации (E1) исходной фракции и охлаждения и нагрева образующихся при ректификационном разделении технологических потоков теплообменники (E2) посредством одной или нескольких различных охлаждающих сред (6-11) удерживаются на уровнях температуры, которые по существу соответствуют уровням температуры во время нормального режима эксплуатации разделительной колонны (разделительных колонн) (T1/T2) и теплообменников (E1, E2). 1 з.п. ф-лы, 4 ил.

СПОСОБ (ВАРИАНТЫ) И УСТРОЙСТВО (ВАРИАНТЫ) ДЛЯ ПОЛУЧЕНИЯ ОБЕДНЕННОГО АЗОТОМ ПРОДУКТА СПГ

Изобретение относится к сжижению потока сырьевого природного газа и удалению из него азота с получением обедненного азотом продукта LNG. Поток сырьевого природного газа проходит через главный теплообменник с получением первого потока LNG, который отделяется с образованием обедненного азотом продукта LNG и потока рецикла, состоящего из обогащенных азотом паров природного газа. Поток рецикла проходит через главный теплообменник с получением первого потока LNG, отдельно от потока сырьевого природного газа и параллельно с ним, с получением первого, по меньшей мере, частично сжиженного обогащенного азотом потока природного газа, который разделяется с получением обогащенного азотом парообразного продукта. Техническим результатом является повышение степени извлечения азота из природного газа. 4 н. и 60 з.п. ф-лы, 11 ил., 2 табл.

СПОСОБ УДАЛЕНИЯ АЗОТА ИЗ ОБОГАЩЕННОЙ УГЛЕВОДОРОДОМ ФРАКЦИИ

Изобретение относится к способу получения сжиженного углеводородного газа с низким содержанием азота. Способ получения сжиженной обогащенной углеводородом фракции (фракции продукта) с содержанием азота ≤ 1 мол.% осуществляют следующим образом. Обогащенную углеводородом фракцию сжижают и переохлаждают с помощью холодильного контура, а затем подвергают ректификационному удалению азота. Способ отличается тем, что: а) сжиженную и переохлажденную обогащенную углеводородом фракцию (2) расширяют (V1) и подают в колонну (Т1) отгонки азота, б) фракцию (4) продукта отводят из ее нижней части, в) обогащенную азотом фракцию (5) отводят из ее верхней части, сжимают (С1), сжижают и переохлаждают (Е1-Е3) с помощью холодильного контура (К), расширяют (V2) и подают в колонну (Т2) азота высокого давления, г) часть потока обогащенной азотом фракции из колонны (Т2) азота высокого давления, который был охлажден с помощью холодильного контура (K), подают в качестве ребойлерного потока (9), д) обедненную азотом ...

ДВУХСТУПЕНЧАТЫЙ ОТВОД АЗОТА ИЗ СЖИЖЕННОГО ПРИРОДНОГО ГАЗА

Азот удаляют из подачи (41) сжиженного природного газа посредством двухступенчатого разделения, в котором сжиженный природный газ (41) подвергают первому фракционированию (23), чтобы обеспечить первый поток (46) пара верхнего погона, обогащенного азотом, и поток (19) жидкого отстоя, содержащего азот, и затем, по меньшей мере, часть указанного потока (19) жидкого отстоя подвергают фракционированию (25), чтобы обеспечить второй поток (36) пара верхнего погона, обогащенного азотом, который имеет более низкую чистоту, чем указанный первый поток (46) пара верхнего погона и поток (50) очищенного сжиженного природного газа. Первое фракционирование проводят в перегонной колонне (23), орошаемой (45) верхним погоном (43) азота, сконденсированного в конденсаторе (24), размещенном в испарительном барабане (25), в котором проводят второе фракционирование. Обеспечение двух потоков (26, 36), содержащих азот с различной концентрацией, дает возможность управлять содержанием азота в топливном газе для использования ...

Комбинированное выделение высоко- и низкокипящих соединений из природного газа

Описан способ выделения высоко- и низкокипящих соединений из сырьевой фракции с высоким содержанием углеводородов, предпочтительно из природного газа, согласно которому сырьевую фракцию (1) частично конденсируют (E1, E2), ректификацией (T1) отделяют жидкую фракцию (8) с высоким содержанием высококипящих компонентов (первая ступень разделения). Образованную при этом газовую фракцию (10), обедненную высококипящими компонентами, по меньшей мере частично конденсируют (E4) и путем ректификации (T2) разделяют на жидкую фракцию с высоким содержанием метана (11) и газовую фракцию с высоким содержанием легкокипящих компонентов (12) (вторая ступень разделения). Согласно изобретению первая ступень разделения (T1) и вторая ступень разделения (T2) термически развязаны. Техническим результатом является обеспечение гибкости производства. 7 з.п. ф-лы, 2 ил.

ИНТЕГРИРОВАННОЕ УДАЛЕНИЕ АЗОТА ПРИ ПРОИЗВОДСТВЕ СЖИЖЕННОГО ПРИРОДНОГО ГАЗА С ИСПОЛЬЗОВАНИЕМ ОХЛАЖДАЕМОГО ТЕПЛОВОГО НАСОСА

... 1. Способ сжижения сырьевого потока природного газа и удаления из него азота, включающий:(а) пропускание сырьевого потока природного газа через главный теплообменник для охлаждения потока природного газа и сжижения всего указанного потока или его части, с образованием в результате первого потока СПГ;(b) отведение первого потока СПГ из главного теплообменника;(с) расширение и частичное испарение сжиженного или частично сжиженного потока природного газа, и введение указанного потока в дистилляционную колонну, в которой поток разделяется на парообразную и жидкую фазы, при этом сжиженный или частично сжиженный поток природного газа является первым потоком СПГ, или является по меньшей мере частично сжиженным обогащенным азотом потоком природного газа, полученным в результате отделения обогащенного азотом потока природного газа от первого потока СПГ или от сырьевого потока природного газа, и по меньшей мере частичного сжижения указанного потока в главном теплообменнике;(d) образование обогащенного ...

КОНСТРУКЦИЯ РЕБОЙЛЕРА КОЛОННЫ ДЕАЗОТИРОВАНИЯ

... 1. Способ деазотирования поступающего потока сжиженного природного газа (СПГ), включающий: ! (а) увеличение объема поступающего потока (102) СПГ и охлаждение поступающего потока СПГ перед увеличением или после в теплообменнике (106) с образованием охлажденного и увеличенного в объеме потока (108) СПГ; ! (b) введение указанного охлажденного и увеличенного в объеме потока (108) СПГ в колонну деазотирования (150); ! (c) отвод обогащенного азотом верхнего потока пара (130) из указанной колонны (150); ! (d) отвод очищенного от азота потока донной жидкости (110) из указанной колонны (150); ! (e) подачу донного потока (110) со стадии (d) через насос (112) для увеличения его давления; ! (f) разделение донного потока (110) на первый поток (114) и второй поток (116); ! (g) по меньшей мере, частичное испарение указанного второго потока (116) путем снижения давления и затем подачу через указанный теплообменник (106); ! (h) впрыскивание указанного частично испаренного второго потока (120) в указанную ...

СПОСОБ КРИОГЕННОЙ ОБРАБОТКИ СЫРЬЯ, СОДЕРЖАЩЕГО АЗОТ И МЕТАН, И УСТРОЙСТВО ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ

Использование: изобретение относится к криогенной технике и используется в основном для разделения азота и метана методом криогенной ректификации. Сущность изобретения: устройство содержит два сепаратора 2 и 11 фаз, отгоночную колонну 3 и устройство для удаления азота. В сепараторе 2 сырье разделяют на первый пар и первую жидкость, разделяют последнюю в отгоночной колонне 3 на обогащенную азотом и обогащенную метаном фракции, причем фракцию обогащенную азотом, подают на ректификацию в устройство для удаления азота, а фракцию, обогащенную метаном, выделяют в качестве готового продукта. Первый пар после частичной конденсации подают в сепаратор 11, где его разделяют на второй пар и вторую жидкость. Второй пар подают на ректификацию, а вторую жидкость - на разделение в отгоночную колонну. 2 с. и 6 з.п. ф-лы, 1 ил.

ПОЛУЧЕНИЕ ПРОДУКТОВ ИЗ ОТХОДЯЩИХ ГАЗОВ НЕФТЕПЕРЕРАБОТКИ

... 1. Способ переработки исходной смеси, состоящей преимущественно из азота (N2), моноксида углерода (СО) и водорода (H2) и содержащей другие компоненты воздуха, такие, например, как аргон (Аr), а также диоксид углерода (СО2), водяной пар и соединения серы, отличающийся тем, что из исходной смеси путем очистки и газоразделения получают Н2 в качестве продукта и/или СО в качестве продукта, а также по меньшей мере еще один продукт (дополнительный продукт), представляющий собой компонент воздуха. ! 2. Способ по п.1, отличающийся тем, что последовательно выполняют сжатие, промывку кислого газа, осушку газа, а также криогенное газоразделение. ! 3. Способ по п.1 или 2, отличающийся тем, что по меньшей мере часть исходной смеси для повышения соотношения Н2/СО подвергают реакции конверсии водяного газа, которая представляет собой высокотемпературную реакцию конверсии, и/или среднетемпературную реакцию конверсии, и/или низкотемпературную реакцию конверсии, и/или изотермическую реакцию конверсии. ! 4 ...

СПОСОБ ОЖИЖЕНИЯ ПРИРОДНОГО ГАЗА ДЛЯ ПОЛУЧЕНИЯ СЖИЖЕННОГО ПРИРОДНОГО ГАЗА

... 1. Способ ожижения газового потока, имеющего высокое содержание метана, при котором ! обеспечивают упомянутый газовый поток под давлением ниже 1000 фунт/кв.дюйм; ! обеспечивают хладагент под давлением ниже 1000 фунт/кв.дюйм; ! сжимают упомянутый хладагент до давления свыше или равного 1500 фунт/кв.дюйм, чтобы обеспечить сжатый хладагент; ! охлаждают упомянутый сжатый хладагент косвенным теплообменом с охлаждающей текучей средой; ! расширяют упомянутый сжатый хладагент для дальнейшего охлаждения упомянутого сжатого хладагента, тем самым получая расширенный, охлажденный хладагент; ! направляют упомянутый расширенный, охлажденный хладагент в теплообменную зону; и ! пропускают упомянутый газовый поток через упомянутую теплообменную зону, чтобы охладить, по меньшей мере, часть упомянутого газового потока косвенным теплообменом с упомянутым расширенным, охлажденным хладагентом, в результате чего формируют охлажденный газовый поток. ! 2. Способ по п.1, при котором обеспечение хладагента под давлением ...

УЛУЧШЕННОЕ УДАЛЕНИЕ АЗОТА В УСТАНОВКЕ ДЛЯ ПОЛУЧЕНИЯ СЖИЖЕННОГО ПРИРОДНОГО ГАЗА

... 1. Способ сжижения потока природного газа в установке для получения сжиженного природного газа, содержащий следующие стадии: ! (a) охлаждение, по меньшей мере, части потока природного газа в первом теплообменнике первого предварительного контура охлаждения с помощью опосредованного теплообмена первым хладоагентом на основе чистого компонента, с получением, таким образом, охлажденного потока природного газа; ! (б) охлаждение, по меньшей мере, части охлажденного потока природного газа в проходе для охлаждения второго теплообменника разомкнутого контура охлаждения метана с получением, таким образом, охлажденного потока, содержащего в основном метан; ! (в) отделение, по меньшей мере, части охлажденного потока, содержащего в основном метан, в емкости для многоступенчатого разделения с получением, таким образом, потока, содержащего в основном пары, и потока, содержащего в основном жидкость; и ! (г) прохождение, по меньшей мере, части потока, содержащего в основном пары, через проход для нагрева ...

СПОСОБ ПОЛУЧЕНИЯ СЖИЖЕННОГО ПРИРОДНОГО ГАЗА

СПОСОБ И СИСТЕМА ДЛЯ УДАЛЕНИЯ АЗОТА ИЗ LNG

ОЧИСТКА СЖИЖЕННОГО ПРИРОДНОГО ГАЗА

... 1. Способ очистки сжиженного природного газа, подводимого под давлением сжижения, содержащего компоненты с низкими точками кипения, для получения потока жидкого продукта с пониженным содержанием компонентов, имеющих низкие точки кипения, который включает (a) расширение сжиженного газа до давления разделения с получением расширенной двухфазной текучей среды; (b) ввод расширенной двухфазной текучей среды в колонну, содержащую единственную секцию контактирования газа и жидкости, при этом расширенную двухфазную текучую среду вводят ниже единственной секции контактирования газа и жидкости, размещенной в этой колонне; (c) накопление в нижней части колонны жидкости из двухфазной текучей среды и отвод из нижней части колонны потока жидкости, имеющей пониженное содержание компонентов с низкими точками кипения с получением потока жидкого продукта; (d) обеспечение протекания пара двухфазной текучей среды через единственную секцию контактирования; (e) отвод из верхней части колонны потока газообразной ...

ОЧИСТКА СЖИЖЕННОГО ПРИРОДНОГО ГАЗА

... 1. Способ очистки сжиженного природного газа, подводимого под давлением сжижения, содержащего компоненты с низкими точками кипения, для получения потока жидкого продукта с пониженным содержанием компонентов, имеющих низкие точки кипения, который включает (a) расширение сжиженного газа до давления разделения на фазы с получением расширенной двухфазной текучей среды; (b) введение расширенной двухфазной текучей среды в колонну ниже секции контактирования газа и жидкости, размещенной в колонне; (c) накопление в нижней части колонны жидкости из двухфазной текучей среды и отвод из нижней части колонны потока жидкости, имеющей пониженное содержание компонентов с низкими точками кипения; ввод потока жидкости в испарительную камеру при низком давлении; удаление второго газового потока через верх испарительной камеры; удаление из нижней части испарительной камеры потока жидкости для получения потока жидкого продукта; (d) обеспечение протекания пара двухфазной текучей среды через секцию контактирования ...

Verfahren und Vorrichtung zur Gewinnung von Druckstickstoff durch Tieftemperaturzerlegung von Luft

Das Verfahren und die Vorrichtung zur Gewinnung von Druckstickstoff durch Tieftemperaturzerlegung von Luft in einem Destillationssäulen-System. Das Destillationssäulen-System weist eine Hochdrucksäule (4), eine Niederdrucksäule (6) sowie einen Hauptkondensator (5) und einen Niederdrucksäulen-Kopfkondensator (7) aufweist, die beide als Kondensator-Verdampfer ausgebildet sind. Verdichtete und gereinigte Einsatzluft (1) wird in einem Hauptwärmetauscher (2) abgekühlt und zum mindestens größten Teil gasförmig in die Hochdrucksäule (4) eingeleitet (3). Ein sauerstoffangereicherter Flüssigstrom (11, 13) wird aus der Hochdrucksäule (4) entnommen und in die Niederdrucksäule eingeleitet. Ein gasförmiger Stickstoffstrom (17, 26A, 26B, 27) wird aus der Hochdrucksäule (4) entnommen, im Hauptwärmetauscher (2) angewärmt und als gasförmiges Druckstickstoffprodukt (28, 31) abgezogen. Der Verdampfungsraum des Niederdrucksäulen-Kopfkondensators (7) ist als Forced-Flow-Verdampfer ausgebildet. Die Hochdrucksäule ...

Verfahren zum Abtrennen von Stickstoff aus Erdgas

Es wird ein Verfahren zum Verflüssigen einer kohlenwasserstoffreichen, stickstoffenthaltenden Einsatzfraktion, vorzugsweise Erdgas, beschrieben. Erfindungsgemäß wird a) die Einsatzfraktion (1) verflüssigt (E1, E2), b) rektifikatorisch (T1) in eine stickstoffangereicherte Fraktion (9), deren Methangehalt max. 1 Vol.-% beträgt, und eine kohlenwasserstoffreiche, stickstoffabgereicherte Fraktion (4) aufgetrennt, c) die kohlenwasserstoffreiche, stickstoffabgereicherte Fraktion (4) unterkühlt (E3) und entspannt (b), d) die entspannte kohlenwasserstoffreiche, stickstoffabgereicherte Fraktion (5) in eine kohlenwasserstoffreiche Fraktion (6), deren Stickstoffgehalt max. 1 Vol.-% beträgt, und eine stickstoffreiche Fraktion (7) aufgetrennt (D1), und e) die stickstoffreiche Fraktion (7) der Einsatzfraktion (1) zugemischt.

Verfahren zum Abtrennen von Stickstoff aus Erdgas

Es wird ein Verfahren zum Zerlegen einer Kohlenwasserstoff-reichen, Stickstoff-enthaltenden Einsatzfraktion (1, 1'), vorzugsweise von Erdgas, beschrieben, wobei die Einsatzfraktion (1, 1') rektifikatorisch (T1, T2) in eine Stickstoff-angereicherte Fraktion (5) und eine Kohlenwasserstoff-reiche, Stickstoff-abgereicherte Fraktion (10) aufgetrennt wird und wobei die rektifikatorische Auftrennung in einer Rektifizierkolonne, bestehend aus einer Vortrennkolonne (T1) und einer Haupttrennkolonne (T2), erfolgt. Erfindungsgemäß wird der Haupttrennkolonne (T2) oberhalb der Zuspeisestelle(n) der aus der Vortrennkolonne (T1) abgezogenen und der Haupttrennkolonne (T2) zugeführten Fraktion (7, 7', 7'') eine Flüssigfraktion (6) entnommen und der Vortrennkolonne (T1) als Rücklauf aufgegeben.

Process and apparatus for separation of hydrocarbons and nitrogen

METHOD AND APPARATUS FOR THE TREATMENT OF LIQUEFIED NATURAL GAS

Ammonia synthesis

An ammonia production process in which excess nitrogen and traces of carbon oxides are removed from raw ammonia synthesis gas firstly by application of partial condensation and secondly by application of washing action provided by carbon-oxides-free liquified gas, rich in nitrogen, which is derived from a cryogenic process used preferentially for separation of hydrogen from the ammonia synthesis loop purge gas as produced in processes which use excess of nitrogen above stoichiometric requirements in the circulating gas in the synthesis loop.

SEPARATION OF NITROGEN FROM METHANE-CONTAINING GAS STREAMS

Process for producing a pure methane fraction

Separation of nitrogen from methane-containing gas streams

A process for separating nitrogen from e.g. natural gas 2 by separating the gas in a first distillation column K1 at superatmospheric pressure to obtain an overhead vapour stream 18 having a nitrogen content greater than that of the feed gas mixture, reducing the pressure of said overhead stream e.g. in valve 20, separating it in a second distillation column K2 and recovering a nitrogen depleted product stream from one or both of the condensate streams 16 and 42 from the distillation steps, and wherein part or all of the reboil for the second distillation column is provided by effecting indirect heat exchange between the liquid column bottoms 10 and the overhead vapour stream 18, with at least partial condensation of the latter. ...

METHOD AND APPARATUS FOR COOLING A GASEOUS MIXTURE

... 1463649 Liquefying gases COMPAGNIE FRANCAISE D'ETUDES ET DE CONSTRUCTION TECHNIP 29 May 1975 [31 May 1974] 23467/75 Heading F4P A method of cooling a gas in line 7c, 8c, 9c, e.g. in the liquefaction of natural gas, by means of a closed refrigerating cycle comprises compressing, partially condensing and separating refrigerant at 1, 2, 4, sub-cooling liquid fraction 4c in exchanger 10 in counter-current with vaporizing refrigerant in shell 10b which is derived by expanding at 11 the sub-cooled liquid fraction, returning revaporized refrigerant from shell 10b via line 15 to an intermediate pressure stage of compressor 1, partially condensing and separating vapour fraction 4b at 10, 5, condensing vapour fraction 5b in exchanger 8 in counter-current with vaporizing refrigerant in shell 86 derived by expanding the condensed vapour fraction 5c at 12, and subcooling this condensed vapour fraction in exchanger 9 in countercurrent with vaporizing refrigerant in shell 9b derived by expanding at 13 ...

A process for removing methane and argon from crude ammonia synthesis gas[

A process for removing methane and argon from crude ammonia synthesis gas, which method comprises the steps of: (a) cooling said crude ammonia synthesis gas in a heat exchanger; (b) distilling the cooled crude ammonia synthesis gas to provide purified ammonia synthesis gas and a liquid fraction containing methane, argon and nitrogen; (c) expanding said liquid fraction containing methane, argon and nitrogen; (d) introducing at least part of the liquid from step (c) into indirect heat exchange with vapor from the top of said distillation column to condense part of said vapor and provide reflux for said distillation column while simultaneously separating said liquid into a liquid stream rich in methane, and a gaseous stream rich in nitrogen; (e) warming said gaseous stream from step (d); (f) compressing at least part of the warmed gaseous stream from step (e); (g) cooling at least part of the compressed gaseous stream from step (f); (h) expanding at least part of the cooled gaseous stream ...

Nitrogen removal with iso-pressure open refrigeration natural gas liquids recovery.

A process for recovery of natural gas liquids is disclosed, the process including: fractionating a gas stream comprising nitrogen, methane, ethane, and propane and other C3+ hydrocarbons into at least two fractions including a light fraction comprising nitrogen, methane, ethane, and propane, and a heavy fraction comprising propane and other C3+ hydrocarbons; separating the light fraction into at least two fractions including a nitrogen-enriched fraction and a nitrogen-depleted fraction in a first separator; separating the nitrogen-depleted fraction into a propane-enriched fraction and a propane-depleted fraction in a second separator; feeding at least a portion of the propane-enriched fraction to the fractionating as a reflux; recycling at least a portion of the propane-depleted fraction to the first separator. In some embodiments, the nitrogen-enriched fraction may be separated in a nitrogen removal unit to produce a nitrogen- depleted natural gas stream and a nitrogen-enriched natural ...

Method of Reducing Compressor Work in a Rectification Circuit

... 1,165,524. Cold separation of gas mixtures. MESSER GRIESHEIM G.m.b.H. 19 June, 1968 [22 June, 1967], No. 29240/68. Heading F4P. Cooling of the head 5 of a gas mixture, e.g. 70% methane and 30% nitrogen, fractionating column 3 having a feed inlet 1 leading through a boiling coil 13 to the column 3 is effected by heat exchange at a coil 10 with a gas, e.g. nitrogen, having been forced by a compressor 17 through a heat exchanger 15 where it is liquefied in heat exchange with condensed feed leaving the coil 13 and having been cooled by expansion in a valve 14, the liquid nitrogen then being expanded at a valve 9 into the column head 5 from which the un-vaporized nitrogen is returned to the compressor inlet. In a modification the coil 10 is dispensed with and the expanded liquid nitrogen is fed into the column head.

METHOD AND APPARATUS FOR PRODUCING A LIQUEFIED HYDROCARBON STREAM

METHOD AND APPARATUS FOR PRODUCING A LIQUEFIED HYDROCARBON STREAM

TREATMENT OF NITROGEN-RICH NATURAL GAS STREAMS

METHOD AND APPARATUS FOR PRODUCING A LIQUEFIED HYDROCARBON STREAM

NATURAL GAS LIQUEFACTION SYSTEM AND METHOD OF PRODUCING A LIQUEFIED NATURAL GAS STREAM

RECOVERY OF HELIUM FROM NITROGEN-RICH STREAMS

METHOD AND APPARATUS FOR PRODUCING A LIQUEFIED HYDROCARBON STREAM

Naturel gas liquefaction with improved nitrogen removal.

METHOD AND APPARATUS FOR PRODUCING A LIQUEFIED HYDROCARBON STREAM

TREATMENT OF NITROGEN-RICH NATURAL GAS STREAMS

NATURAL GAS LIQUEFACTION SYSTEM AND METHOD OF PRODUCING A LIQUEFIED NATURAL GAS STREAM

METHOD AND APPARATUS FOR PRODUCING A LIQUEFIED HYDROCARBON STREAM

RECOVERY OF HELIUM FROM NITROGEN-RICH STREAMS

TREATMENT OF NITROGEN-RICH NATURAL GAS STREAMS

RECOVERY OF HELIUM FROM NITROGEN-RICH STREAMS

NATURAL GAS LIQUEFACTION SYSTEM AND METHOD OF PRODUCING A LIQUEFIED NATURAL GAS STREAM

Verfahren und Vorrichtung zur Trennung eines verflüssigbaren Gasgemisches

The invention relates to a method for separating a liquefiable gas mixture consisting of a plurality of components, comprising at least a first component (K1) and a second component (K2) wherein, under an elevated pressure p1, the first component (K1) has a melting point T * K1 that is higher than the melting point T* K2 of the second component (K2). In order to realize the most compact structure possible, the method according to the invention comprises the following steps: - converting the gas mixture into a liquid state at a temperature T0 and a pressure p0, where T* K2 < T0 T* K1 and p0 < p1, and the first component (K1) is present in a starting concentration (C0); - and producing a pressure gradient in the liquefied gas mixture, wherein the elevated pressure p1 prevails at least in a limited spatial region (3) of the liquefied gas mixture, and the first component (K1) freezes out.

HELIUM RECUPERATION PROCEDURE FROM A NATURAL GAS STREAM.

MODULARIZED LNG SEPARATION DEVICE AND FLASH GAS HEAT EXCHANGER

Described herein are methods and systems for the liquefaction of natural gas to produce a LNG product. The methods and systems use an apparatus for separating a flash gas from a liquefied natural gas (LNG) stream to produce a LNG product and recovering refrigeration from the flash gas. The apparatus includes a shell casing enclosing a heat exchange zone comprising a coil wound heat exchanger, and a separation zone. The heat exchange zone is located above and in fluid communication with the separation zone. Flash gas is separated from the LNG product in the separation zone and flows upwards from the separation zone into the heat exchange zone where refrigeration is recovered from the separated flash gas.

Method for separating off nitrogen and hydrogen from natural gas

Abstract Method for separating off nitrogen and hydrogen from natural gas A method is described for separating off nitrogen and lighter components, in particular hydrogen, carbon monoxide, neon and argon, from a feed fraction that is to be liquefied 5 containing at least methane, nitrogen and hydrogen, wherein the cooling and liquefaction of the feed fraction proceeds against the refrigerant or mixed refrigerant of at least one refrigeration cycle. According to the invention, 10 a) the feed fraction (1) is partially condensed (E1), b) is separated in at least one rectification column (T) into a methane-rich fraction (6) and a fraction (4) containing nitrogen and lighter components, and c) the methane-rich fraction (6) is subcooled, d) wherein the cooling of the top condenser (E2) of the rectification column (T) 15 proceeds via the refrigerant or mixed refrigerant or a substream of the refrigerant or mixed refrigerant of the, or at least one, refrigeration cycle (20 24). Ill. CNCf CYCo CY ...

INTEGRATED NITROGEN REMOVAL IN THE PRODUCTION OF LIQUEFIED NATURAL GAS USING REFRIGERATED HEAT PUMP

A method for liquefying a natural gas feed stream and removing nitrogen 5 therefrom, the method comprising passing a natural gas feed stream through a main heat exchanger to produce a first LNG stream, and separating a liquefied or partially liquefied natural gas stream in a distillation column to form nitrogen-rich vapor product, wherein a closed loop refrigeration system provides refrigeration to the main heat exchanger and to a condenser heat exchanger that provides reflux to the distillation 10 column. 214 216 "''''''''' ---------- 164 110232 218 20172 14 - ---- 0 176 1 224 F*1 d0 230 14 156 162 106 254 182 104 2 2 208 2 102 228 250 100 : 20219 Figure 1 ...

Enhanced nitrogen removal in an LNG facility

An LNG facility employing an enhanced nitrogen removal system that concentrates the amount of nitrogen in the feed stream to a nitrogen removal unit (NRU) to thereby increase the separation efficiency of the NRU. In one embodiment, the nitrogen removal system comprises a multistage separation vessel operable to separate nitrogen from a cooled natural gas stream. At least a portion of the resulting nitrogen-containing stream exiting the multistage separation vessel can be used as a refrigerant, processed to a nitrogen removal unit, and/or utilized as fuel gas for the LNG facility.

Method of denitrogenating a charge of a liquified hydrocarbon mixture consisting mainly of methane and containing at least 2% mol nitrogen

Nitrogen rejection system for liquefied natural gas

Liquefaction process and apparatus

NITROGEN REJECTION FROM CONDENSED NATURAL GAS

Method for the rejection of nitrogen from condensed natural gas which comprises (a) introducing the condensed natural gas into a distillation column at a first location therein, withdrawing a nitrogen-enriched overhead vapor stream from the distillation column, and withdrawing a purified liquefied natural gas stream from the bottom of the column; (b) introducing a cold reflux stream into the distillation column at a second location above the first locatino, wherein the refrigeration to provide the cold reflux stream is obtained by compressing and work expanding a refrigerant stream comprising nitrogen; and (c) either (1) cooling the purified liquefied natural gas stream or cooling the condensed natural gas stream or (2) cooling both the purified liquefied natural gas stream and the condensed natural gas stream, wherein refrigeration for (1) or (2) is obtained by compressing and work expanding the refrigerant stream comprising nitrogen. The refrigerant stream may comprise all or a portion ...

NATURAL GAS LIQUEFACTION WITH NITROGEN REJECTION STABILIZATION

SCALABLE CAPACITY LIQUEFIED NATURAL GAS PLANT

CRYOGENIC SEPARATION OF SYNTHESIS GAS

A process and apparatus for separating a feed containing hydrogen, carbon monoxide, methane, and optionally nitrogen to form a product gas having a desired H2:CO molar ratio and optionally a hydrogen product gas and a carbon monoxide product gas. The feed is partially con-densed to form a hydrogen-enriched vapor fraction and a carbon monox-ide-enriched liquid fraction. The hydrogen-enriched vapor fraction and carbon monoxide-enriched liquid fraction are combined in a regulated manner to form an admixture, which is cryogenically separated to form the product mixture having the desired H2:CO molar ratio.

PROCESS FOR SEPARATING METHANE AND NITROGEN

Process for Separating Methane and Nitrogen A process for the separation of methane and nitrogen in a cryogenic distillation column driven by a closed loop recirculating fluid heat pump wherein additional column refrigeration is generated by rejecting process heat into a product stream thereby reducing the need for expansion of process streams and enabling recovery of product at relatively high pressure.

LIQUEFACTION OF HIGH PRESSURE GAS

LIQUEFACTION OF HIGH PRESSURE GAS A process for liquefying a gas at a pipeline pressure of above about 650 psia and at ambient temperature, in which the gas is cooled to sequentially lower temperatures, by passing the gas through a plurality of cooling stages in indirect heat exchange with at least one refrigerant and near its liquefaction temperature, the cooled gas is expanded to a lower pressure, the expanded gas is further cooled to its liquefaction temperature, using indirect heat exchange with an expanded refrigerant, the liquefied gas is expanded to atmospheric pressure for storage or transport, by passing the liquefied gas through at least one expansion stage and vapors collected from the expansion stage are compressed and added to the expanded gas prior to liquefaction. To the extent that the gas is natural gas and contains significant amounts of nitrogen, the liquefied gas is passed through a nitrogen rejection cycle prior to passage through the expansion stage.

NITROGEN REJECTION FROM NATURAL GAS INTEGRATED WITH NGL RECOVERY

A process is set forth for the recovery of methane, nitrogen and natural gas liquids (C2+) from a natural gas feed stream wherein the recovery can be made at high pressure by the integration of a nitrogen rejection stage including a heat pump driven distillation column and a natural gas liquids stage. Nitrogen can be rejected over a wide range of nitrogen concentration (approximately 1 to about 80%) of the feed stream.

HYDROCARBON RECOVERY FROM FUEL GAS

High purity methane is recovered from a fuel gas stream containing the same in admixture with mainly nitrogen and carbon dioxide by first removing the carbon dioxide by selective adsorption in a PSA system and separating the remaining nitrogen from the methane by cryogenic distillation the rejected nitrogen being employed for purging the CO2-laden adsorbent beds of the PSA system. Cyclic regeneration of the sorbent-laden bed may entail nitrogen purge with or without including a carbon dioxide rinse or the nitrogen purge of the sorbent-laden bed may be used in conbination with pressure let-down by gas withdrawal into one or more companion beds.

PROCESS FOR COOLING A GASEOUS MIXTURE AND PLANT THEREFOR

La présente invention concerne un procédé et une installation refroidissement d'un mélange gazeux. Selon l'invention, on effectue sous une haute pression une condensation fractionnée d'un mélange de cycle, comprenant au moins une première étape et une dernière étape de condensation fractionnée; on détend l'avant-derniére et la dernière fraction condensée du mélange de cycle à une basse pression pour constituer un courant frigorigène principal, et on détend au moins la première fraction condensée du mélange de cycle à une pression intermédiaire entre la haute pression et la basse pression pour constituer un courant frigorigène auxiliaire. L'invention s'applique à la liquéfaction d'un gaz naturel.

PROCESS FOR THE RECOVERY OF ARGON

PROCESS FOR THE RECOVERY OF ARGON There is disclosed an improved process for recovering argon from a tail gas stream, preferably a tail gas obtained from a hydrogen recovery unit processing a purge gas obtained in the synthesis of ammonia and comprised of argon, methane, nitrogen, and residual quantities of hydrogen, wherein the tail gas is partially liquefied prior to introduction into a first fractionation column to form a bottoms liquid stream comprised of argon and methane wherein such liquid stream is thereupon introduced into a second fractionation column to separate argon as an overhead gaseous stream which is condensed to form liquid argon or as product.

PROCESS TO SEPARATE NITROGEN FROM NATURAL GAS

LIQUEFIED NATURAL GAS PRODUCTION SYSTEM AND METHOD WITH GREENHOUSE GAS REMOVAL

HELIUM EXTRACTION FROM NATURAL GAS

A helium-containing stream is recovered from a natural gas feed using a membrane followed by multiple distillation steps Refrigeration is provided by expanding a bottoms liquid with a higher nitrogen content than the feed, achieving a lower temperature in the process The helium-enriched vapor is then purified and the helium-containing waste stream is recycled to maximize recovery and reduce the number of compressors needed. The helium-depleted natural gas stream can be returned at pressure for utilization or transportation ...

SYSTEM AND METHOD FOR SEPARATING NATURAL GAS LIQUID AND NITROGEN FROM NATURAL GAS STREAMS

A system and method for removing nitrogen and producing a high pressure methane product stream and an NGL product stream from natural gas feed streams where at least 90%, and preferably at least 95%, of the ethane in the feed stream is recovered in the NGL product stream. The system and method of the invention are particularly suitable for use with feed streams in excess of 5 MMSCFD and up to 300 MMSCFD and containing around 5% to 80% nitrogen. The system and method preferably combine use of strategic heat exchange between various process streams with a high pressure rectifier tower and the ability to divert all or a portion of a nitrogen rejection unit feed stream to optionally bypass a nitrogen fractionation column to reduce capital costs and operating expenses.

METHOD AND APPARATUS FOR PRODUCING A LIQUEFIED HYDROCARBON STREAM

A cryogenic hydrocarbon composition, obtained by subjecting a raw liquefied hydrocarbon stream to a pressure reduction step, is first separated into a vaporous reject stream and a liquid stream. The liquid stream is discharged in the form of the liquefied hydrocarbon stream. The vaporous reject stream is recompressed, partially condensed by indirectly heat exchanging the compressed vapour stream against an auxiliary refrigerant stream, and separated. The condensed fraction is revaporized and combusted in a gas turbine. The vapour fraction, which generally has a higher nitrogen content and a lower heating value than the condensed fraction, is combusted in a combustion device other than a gas turbine. The auxiliary refrigerant stream is formed by a slip stream of the liquefied hydrocarbon stream.

METHOD FOR RECOVERING HELIUM

The invention relates to a method for recovering a helium product fraction (6) from a nitrogen- and helium-containing feed fraction (3). The nitrogen- and helium-containing feed fraction (3) is partially condensed (E1) and separated into a first helium-enriched fraction (5) and a first nitrogen-enriched fraction (8), and the former is cleaned again in an adsorptive manner. According to the invention, the separation is carried out in a separation column (T) which is supplied with the first nitrogen-enriched fraction (8) as a return flow and with a sub-flow of the second nitrogen-enriched fraction as a stripping gas (12). The stripping gas quantity (12) is set such that a third nitrogen-enriched fraction (20) which contains at least 30% of the nitrogen contained in the first nitrogen-enriched fraction (8) can be recovered in the separation column (T).

SYSTEM AND METHOD FOR SEPARATING WIDE VARIATIONS IN METHANE AND NITROGEN

A system and method for removing nitrogen and producing a high pressure methane product stream from natural gas feed streams having wide variations in nitrogen and methane content are disclosed. Optional add-on systems may be incorporated into the nitrogen and methane separation to produce an NGL sales stream to reduce excess hydrocarbons in the nitrogen vent stream, or to recover helium. The system and method of the invention are particularly suitable for use with feed streams in excess of 50 MMSCFD and up to 300 MMSCFD and containing up to 100 ppm carbon dioxide. Typical power requirements for compressing the methane product stream to produce a suitably high pressure stream for sale are reduced according to the systems and methods of the invention.

ENHANCED NITROGEN REMOVAL IN AN LNG FACILITY

An LNG facility employing an enhanced nitrogen removal system that concentrates the amount of nitrogen in the feed stream to a nitrogen removal unit (NRU) to thereby increase the separation efficiency of the NRU. In one embodiment, the nitrogen removal system comprises a multistage separation vessel operable to separate nitrogen from a cooled natural gas stream. At least a portion of the resulting nitrogen-containing stream exiting the multistage separation vessel can be used as a refrigerant, processed to a nitrogen removal unit, and/or utilized as fuel gas for the LNG facility.

PROCESS TO SEPARATE NATURAL GAS LIQUIDS FROM NITROGEN- CONTAINING NATURAL GAS

PROCESS FOR SEPARATING HYDROCARBON COMPOUNDS

Disclosed herein are processes for producing and separating ethane and ethylene. In some embodiments, an oxidative coupling of methane (OCM) product gas comprising ethane and ethylene is introduced to a separation unit comprising two separators. Within the separation unit, the OCM product gas is separated to provide a C2-rich effluent, a methane-rich effluent, and a nitrogen-rich effluent. Advantageously, in some embodiments the separation is achieved with little or no external refrigeration requirement.

COPRODUCTION OF A NORMAL PURITY AND ULTRA HIGH PURITY VOLATILE COMPONENT FROM A MULTI-COMPONENT STREAM

METHOD AND PLANT FOR LIQUEFYING NATURAL GAS

On liquéfie un gaz naturel sous pression comprenant au moins un cycle de réfrigération à l'aide d'un mélange de fluides réfrigérants en procédant au moins aux étapes suivantes: a) on condense au moins en partie ledit mélange réfrigérant en le comprimant (K1) et en le refroidissant (C1), par exemple, à l'aide d'un fluide externe de refroidissement, pour obtenir au moins une fraction vapeur (5) et une fraction liquide (6), b) on détend séparement (T1, V1) au moins en partie chacune des fractions vapeur et liquide pour obtenir un fluide léger M1 composé on majorité d'une phase vapeur et un fluide lourd M2 composé en majorité d'une phase liquide, c) on mélange au moins en partie les fluides M1 et M2 pour obtenir un mélange (10) à basse température, et d) on liquéfie et on sous-refroidit le gaz naturel sous pression (1) par échange thermique avec le mélange à basse température obtenu au cours de l'étape c).

DISTILLATION PROCESS TO SEPARATE MIXTURES CONTAINING THREE OR MORE COMPONENTS

A technique is set forth to reduce the heat requirement of conventional distilla tion processes which separate feed mixtures containing three or more components. The technique provides a great deal of flexibility in adjusting the temperatures of the required utilities including a scenario where the heat requirement is reduced without a n eed for additional higher temperature (and more costly) heat utility. In this technique, when a liquid bottoms stream (or gaseous overhead stream) containing two or more components is sent from an earlier column to a subsequent column, then a return vapor (or liquid) stream is implemented between the same locations in the two columns.

PROCESS AND APPARATUS FOR COOLING A FLUID ESPECIALLY FOR LIQUIFYING NATURAL GAS

In this process, which incorporates an integral cascade, the coolant mixture issuing from the penultimate stage (1B) of the compressor cycle (1) is delivered to a distillation apparatus (5) the head vapour of which is cooled (in 24) to a temperature significantly lower than the ambient temperature, then separated into two phases (in 6C); the vapour stage is supplied to the last stage (1C) of the compressor, and the liquid phase constitutes a coolant fluid for the hot part (8) of the heat exchange line (7).

METHOD AND APPARATUS FOR LIQUEFYING NATURAL GAS

Le procédé de liquéfaction d'un gaz naturel selon l'invention consiste à liquéfier au moins en partie ce gaz en le détendant avec fourniture d'énergi e mécanique, le gaz au cours de cette détente passant d'une phase dense à une phase liquide sans transition de phase. Le procédé comporte au moins les deu x étapes suivantes: a) on refroidit le gaz naturel constitué de plusieurs constituants à une pression au moins supérieure ou égale à la valeur de pression critique du méthane et à une température telle que ledit gaz se présente en phase dense à la fin de ce refroidissement, b) on détend et on liquéfie au moins en partie une fraction de ladite phase dense provenant de l'étape a) à travers un dispositif (T3) adapté à diminuer la pression du gaz selon une détente avec fourniture d'énergie mécanique, le passage de l'état en phase dense vers un état en phase liquide se faisant sensiblement sans transition de phase.

Verfahren zum Verflüssigen eines Gasgemisches mittels fraktionierter Kondensation

Verfahren und Anlage zur Deckung von Stickstoffverlusten und zur Wiederverflüssigung von verdampften Erdgasanteilen in Tankschiffen

METHOD OF GAS LIQUEFACTION AND DENITRATION NATURAL GAS, INSTALLATION FOR ITS REALIZATION AND GASES, OBTAINED AS A RESULT OF THIS SEPARATION

СПОСОБ УДАЛЕНИЯ АЗОТА ИЗ ПОТОКА, СОДЕРЖАЩЕГО ПРЕИМУЩЕСТВЕННО МЕТАН

Предложен способ удаления азота из потока, содержащего преимущественно метан, в процессе сжижения природного газа, включающий в себя стадии, на которых (а) подогревают поток, содержащий преимущественно метан, в метановом экономайзере, размещенном в теплоизолированном кожухе для метана; (б) разделяют подогретый поток, содержащий преимущественно метан, на первую часть и вторую часть; (в) подают первую часть к первому входному отверстию метанового компрессора и вторую часть в блок удаления азота; (г) удаляют азот из второй части подогретого потока, содержащего преимущественно метан, в блоке удаления азота, получая первый поток со сниженной концентрацией азота и поток, обогащенный азотом.

METHOD OF REMOVING NITROGEN FROM NATURAL GAS

СПОСОБ ПОЛУЧЕНИЯ ПОТОКОВ ЖИДКОГО И ГАЗООБРАЗНОГО АЗОТА, ГАЗОВОГО ПОТОКА С ВЫСОКИМ СОДЕРЖАНИЕМ ГЕЛИЯ И ДЕАЗОТИРОВАННОГО ПОТОКА УГЛЕВОДОРОДОВ И УСТАНОВКА ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ

Этот способ содержит следующие стадии: поток подачи (72) охлаждают внутри входного теплообменника (28). Охлажденный поток (76) подачи вводят во фракционирующую колонну (50) и в донной части колонны (50) отбирают деазотированный поток углеводородов. Поток (106) с высоким содержанием азота, выходящий из головной части колонны (50), вводят в сепаратор (60) и отбирают головной газовый поток из сепаратора (60) для получения потока (20) с высоким содержанием гелия. Жидкий поток (110), выходящий из донной части первого сепаратора (60), разделяют на жидкий поток (18) азота и на первый поток (114) флегмы, который вводят в виде флегмы в головную часть фракционирующей колонны (50).

СИСТЕМА ДЛЯ СЖИЖЕННОГО ПРИРОДНОГО ГАЗА (СПГ) С ОТБРАКОВКОЙ ТЁПЛОГО АЗОТА

Предложена система для сжижения природного газа, в которой применяется усовершенствованная система для удаления азота, выполненная с возможностью удаления азота из потока относительно теплого природного газа.

СПОСОБ ПОЛУЧЕНИЯ ПОТОКОВ ЖИДКОГО И ГАЗООБРАЗНОГО АЗОТА, ГАЗОВОГО ПОТОКА С ВЫСОКИМ СОДЕРЖАНИЕМ ГЕЛИЯ И ДЕАЗОТИРОВАННОГО ПОТОКА УГЛЕВОДОРОДОВ И УСТАНОВКА ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ

Этот способ содержит следующие стадии: поток подачи (72) охлаждают внутри входного теплообменника (28). Охлажденный поток (76) подачи вводят во фракционирующую колонну (50) и в донной части колонны (50) отбирают деазотированный поток углеводородов. Поток (106) с высоким содержанием азота, выходящий из головной части колонны (50), вводят в сепаратор (60) и отбирают головной газовый поток из сепаратора (60) для получения потока (20) с высоким содержанием гелия. Жидкий поток (110), выходящий из донной части первого сепаратора (60), разделяют на жидкий поток (18) азота и на первый поток (114) флегмы, который вводят в виде флегмы в головную часть фракционирующей колонны (50).

SYSTEM AND METHOD FOR PRODUCTION OF LIQUEFIED NATURAL GAS WITH REMOVAL OF HOTHOUSE GAS

СПОСОБ СЖИЖЕНИЯ И ДЕАЗОТАЦИИ ПРИРОДНОГО ГАЗА И ГАЗЫ, ПОЛУЧЕННЫЕ В РЕЗУЛЬТАТЕ ЭТОГО РАЗДЕЛЕНИЯ

Изобретение относится к способу сжижения и деазотации природного газа (1), содержащего азот, согласно которому упомянутый газ охлаждают, сжижают и разделяют на первую головную фракцию (9), относительно более летучую и обогащенную азотом, и на первую донную фракцию (15). Способ отличается тем, что первую головную фракцию (9) охлаждают и сжижают, разделяют на вторую, относительно более летучую головную фракцию (11), которая производит газообразный азот (29), и на вторую донную фракцию (12), которая подвергается снова обработке, и тем, что первую донную фракцию (15) охлаждают для того, чтобы произвести сжиженный природный газ, по существу, очищенный от азота (24). Описаны также другие варианты выполнения.

METHOD OF TREATMENT OF OF FLOW UGS, OBTAINED COOLING BY MEANS OF THE FIRST COOLING CYCLE, AND APPROPRIATE INSTALLATION

METHOD AND DEVICE FOR PRODUCTION OF LIQUEFIED FLOW OF HYDROCARBONS

METHOD AND APPARATUS FOR PREPARATION NITROGEN-HYDROGEN MIX AND AMMONIA

Method for separating off nitrogen and hydrogen from natural gas

The invention relates to a method for separating off nitrogen and lighter components, in particular hydrogen, carbon monoxide, neon and argon, from a feed fraction (e.g., natural gas) that is to be liquefied containing at least methane, nitrogen and hydrogen. The cooling and liquefaction of the feed fraction proceeds against the refrigerant or mixed refrigerant of at least one refrigeration cycle. In the inventive method, the feed fraction ( 1 ) is partially condensed (E 1 ), and separated in at least one rectification column (T) into a methane-rich fraction ( 6 ) and a fraction ( 4 ) containing nitrogen and lighter components. The methane-rich fraction ( 6 ) is subcooled. Additionally, cooling of the top condenser (E 2 ) of the rectification column (T) proceeds via a refrigerant or mixed refrigerant or a substream of the refrigerant or mixed refrigerant of at least one, refrigeration cycle ( 20 - 24 ).

Removal of hydrogen

The invention relates to a method for liquefying a hydrocarbon-rich fraction ( 1, 1′ ) which contains substantially methane, hydrogen and nitrogen. In the inventive method, before the liquefaction (V) of the hydrocarbon-rich fraction ( 1, 1′ ), the hydrogen ( 2 ) is removed (M) by permeation. This removal (M) of the hydrogen ( 2 ) by permeation is effected in a single-stage or multistage removal process.

CRYOGENIC VARIABLE LIQUID PRODUCTION METHOD

A method of producing a liquid product stream, for example, a liquid nitrogen product stream, at a production rate that is selectively varied. This variation is produced in either a waste expansion or air expansion process by increasing the pressure and flow rate of the feed stream during periods in which a high rate of liquid production is desired without substantially increasing the pressure of the exhaust stream produced by a variable speed turboexpander. This increases the expansion ratio across the turboexpander and therefore the refrigeration supplied to increase liquid production. At the same time, the increase in flow rate prevents a decrease in the performance of the variable speed turboexpander. 1. A method of producing a liquid product stream at a production rate that is selectively varied , said method comprising:producing the liquid product stream as a result of a cryogenic rectification process which employs a distillation column for separating nitrogen from a feed stream comprising the nitrogen and oxygen after having been compressed, purified and cooled;the cryogenic rectification process employing a refrigeration cycle that comprises partially cooling at least part of the feed stream within a main heat exchanger used within the cryogenic rectification process for cooling the feed stream, expanding the at least part of the feed stream in a variable speed turboexpander to generate an exhaust stream and introducing the exhaust stream into the distillation column;selectively varying the production rate of the liquid product stream by varying feed stream pressure of the feed stream such that the expansion ratio across the variable speed turboexpander increases and consequently the refrigeration imparted to the cryogenic rectification process is also increased, thereby increasing the production rate of the liquid product stream and vice-versa; andincreasing flow rate of the feed stream during an increase of the feed stream pressure and vice-versa such ...

System and Method for Removing Excess Nitrogen from Gas Subcooled Expander Operations

A system and method for removing nitrogen from an intermediate stream in a gas subcooled process operation that processes natural gas into a sales gas stream and a natural gas liquids stream. The system and method of the invention are particularly suitable for use with gas subcooled process operations where the sales gas stream exceeds pipeline nitrogen specifications by up to about 3%, such as for reducing the nitrogen content of sales gas streams to levels permissible for pipeline transport.

Two Step Nitrogen and Methane Separation Process

A system and method for removing nitrogen and producing a high pressure methane product stream from natural gas feed streams is disclosed. A system for also producing natural gas liquids in conjunction with nitrogen removal from natural gas feed streams is also disclosed. The system and method of the invention are particularly suitable for use with feed streams in excess of 50 MMSCFD and up to 750 MMSCFD and containing up to 75 ppm carbon dioxide. Typical power requirements for compressing the methane product stream to produce a suitably high pressure stream for sale are reduced according to the system and method of the invention. 1. A method for removing nitrogen and for producing a high pressure methane product stream and a natural gas liquids stream , the method comprising:providing a feed stream comprising nitrogen, methane, ethane, and propane;separating the feed stream into a first overhead stream and a first bottoms stream in a first fractionating column;separating the first overhead stream into a second overhead stream and a second bottoms stream in a second fractionating column;separating at least a portion of the first bottoms stream into a third overhead stream and a natural gas liquids product stream in a third fractionating column;dividing the second bottoms stream into a first split stream, a second split stream, and a third split stream;cooling the first split stream through heat exchange with the second overhead stream;reducing the pressure of the cooled first split stream by passing through a first expansion valve to form a low pressure stream;reducing the pressure of the second split stream by passing through a second expansion valve to form an intermediate pressure stream;mixing the third split stream and the third overhead stream to form a high pressure stream;cooling the feed stream prior to entering the first fractionating column through heat exchange with the second overhead stream, low pressure stream, intermediate pressure stream, high ...

METHOD AND DEVICE FOR GENERATING GASEOUS COMPRESSED NITROGEN

Method and device for generating gaseous compressed nitrogen by the low-temperature separation of air in a distillation column system, having a pre-column, a high-pressure column and a low-pressure column. The feed air is compressed, purified in a purification apparatus and cooled. A first sub-flow of the cooled feed air is introduced in a predominantly liquid state into the distillation column system. A gaseous fraction from the pre-column in introduced into the liquefaction chamber of a pre-column head condenser with liquid formed therein fed as reflux into the pre-column. A first gaseous nitrogen product fraction is drawn from the high-pressure column, heated, and obtained as first gaseous compressed nitrogen product. At least a part of the second sub-flow is introduced into the evaporation chamber of the pre-column head condenser. A third sub-flow of the cooled feed air is expanded to perform work and subsequently introduced into the liquefaction chamber. 2. The method as claimed in claim 1 , characterized in that a second gaseous nitrogen product fraction is drawn off from the pre-column in gaseous form claim 1 , warmed in the main heat exchanger and obtained as to second gaseous compressed product.3. The method as claimed in claim 1 , characterized in that less than 30 mol % of the input air quantity is fed in the liquid state into the distillation column system.4. The method as claimed in claim 1 , characterized in that the total quantity of oxygen-enriched currents that are fed in the liquid state from the pre-column and the evaporation chamber of the pre-column head condenser into the high-pressure column and the low-pressure column is less 14% than the input air quantity.5. The method as claimed in claim 1 , characterized in thatthe second partial current is compressed before being cooled in the main heat exchanger to a high pressure that is higher than the operating pressure of the pre-column, and is liquefied or pseudo-liquefied in the main heat ...

APPARATUS FOR THE PRODUCTION OF AIR GASES BY THE CRYOGENIC SEPARATION OF AIR WITH VARIABLE LIQUID PRODUCTION AND POWER USAGE

An apparatus for the production of air gases by the cryogenic separation of air can include a cold box having a heat exchanger, and a system of columns; a pressure monitoring device; and a controller. The cold box can be configured to receive a purified and compressed air stream under conditions effective for cryogenically separating the air stream to form an air gas product. The apparatus may also include means for transferring the air gas product from the cold box to an air gas pipeline. The pressure monitoring device is configured to monitor the pipeline pressure, and the controller is configured to determine whether to operate in a power savings mode or a variable liquid production mode. By operating the apparatus in a dynamic fashion, a power savings and/or additional high value cryogenic liquids can be realized in instances in which the pipeline pressure deviates from its highest value. 1. An apparatus for the production of air gases by the cryogenic separation of air , the apparatus comprising:{'sub': 'o', 'a) a main air compressor configured to compress air to a pressure suitable for the cryogenic rectification of air to produce a compressed humid air stream, the compressed humid air stream having a first pressure P;'}b) a front end purification system configured to purify the compressed humid air stream of water and carbon dioxide to produce a dry air stream having reduced amounts of water and carbon dioxide as compared to the compressed humid air stream;{'sub': 'B1', 'c) a booster compressor in fluid communication with the front end purification system, wherein the booster compressor is configured to compress a first portion of the dry air stream to form a boosted air stream, the boosted air stream having a first boosted pressure P;'}d) a cold box comprising a main heat exchanger, a system of columns having a double column composed of a lower pressure column and a higher pressure column, a condenser disposed at a bottom portion of the lower pressure column ...

SYSTEM AND METHOD FOR RARE GAS RECOVERY

A system and method for argon and nitrogen extraction and liquefaction from a low-pressure tail gas of an ammonia production plant is provided. The preferred tail gas of the ammonia production plant comprises methane, nitrogen, argon, and hydrogen. The disclosed system and method provides for the methane rejection via rectification and hydrogen rejection by way of a side stripper column or phase separator. The resulting nitrogen and argon containing stream is separated and liquefied in a double column distillation system. 1. A method for recovering a rare gas from a pre-purified feed gas comprising hydrogen , nitrogen , methane , argon , and one or more rare gases , the method comprising the steps of:directing the pre-purified feed gas to a rectification column;separating the pre-purified feed gas in a rectification column to produce a methane-rich liquid column bottoms containing the one or more rare gases and an hydrogen-nitrogen rich gas overhead;conditioning the methane-rich liquid column bottoms containing rare gases to produce a stream having a vapor fraction greater than 90% and at or near saturation;directing the methane rich stream and a rare gas lean stream to an auxiliary wash/rectifying column, wherein the rare gas lean stream is a liquid stream extracted from the rectification column or a liquid nitrogen stream;rectifying the two phase methane rich stream and the rare gas lean stream to produce a liquid bottoms rare gas concentrate and a methane-rich overhead; andseparating one or more rare gases from the liquid bottoms rare gas concentrate to produce a rare gas product stream.2. The method of claim 1 , wherein the feed gas is a tail gas from an ammonia plant.3. The method of wherein the rare gas is krypton or xenon.4. The method of claim 1 , wherein the feed gas contains greater than about 50% nitrogen by mole fraction.5. The method of wherein the feed gas is a high pressure feed gas having a pressure of between about 300 psia to 500 psia.6. The method ...

Liquefied Natural Gas Production System and Method With Greenhouse Gas Removal

Described herein are systems and processes to produce liquefied natural gas (LNG) using liquefied nitrogen (LIN) as the refrigerant. Greenhouse gas contaminants are removed from the LIN using a greenhouse gas removal unit.

Increasing Efficiency In An LNG Production System By Pre-Cooling A Natural Gas Feed Stream

Described herein are systems and processes to produce liquefied natural gas (LNG) using liquefied nitrogen (LIN) as the refrigerant. Greenhouse gas contaminants are removed from the LIN using a greenhouse gas removal unit. The LNG is compressed prior to being cooled by the LIN. 1. A liquefied natural gas production system , the system comprising:a natural gas stream from a supply of natural gas;a refrigerant stream from a refrigerant supply;at least one heat exchanger that exchanges heat between the refrigerant stream and the natural gas stream to at least partially vaporize the refrigerant stream and at least partially condense the natural gas stream;a natural gas compressor that compresses the natural gas stream to a pressure of at least to 135 bara to form a compressed natural gas stream;a natural gas cooler that cools the compressed natural gas stream after being compressed by the natural gas compressor; anda natural gas expander that expands the compressed natural gas to a pressure less than 200 bara, but no greater than the pressure to which the natural gas compressor compresses the natural gas stream, after being cooled by the natural gas cooler;wherein the natural gas expander is connected to the at least one heat exchanger to supply natural gas thereto.2. The liquefied natural gas production system of claim 1 , wherein the natural gas compressor compresses the natural gas stream to a pressure greater than 200 bara.3. The liquefied natural gas production system of claim 1 , wherein the natural gas expander expands the compressed natural gas stream to a pressure less than 135 bara.4. The liquefied natural gas production system of claim 1 , wherein the at least one heat exchanger comprises a first heat exchanger claim 1 , and further comprising a second heat exchanger that cools the natural gas stream prior to the natural gas stream being compressed in the natural gas compressor.5. The liquefied natural gas production system of claim 4 , wherein the ...

CONFIGURATIONS AND METHODS FOR NITROGEN REJECTION, LNG AND NGL PRODUCTION FROM HIGH NITROGEN FEED GASES

Variable N2 content in feed gas ranging from 3 mol % to 50 mol % can be rejected from the process using a feed exchanger that is fluidly coupled with a cold separator and a single fractionation column to produce a nitrogen vent stream and streams that are suitable to be further processed for NGL recovery and LNG production. 1. A plant with a nitrogen removal unit and a natural gas liquids recovery unit , comprising:a feed gas source configured to provide a hydrocarbonaceous feed gas having a CO2 content of equal or less than 50 ppmv, a water content of equal or less than 0.1 ppmv, and a nitrogen content of at least 3 mol %;a heat exchanger configured to receive and cool the hydrocarbonaceous feed gas to a temperature that condenses C3+ components in the hydrocarbonaceous feed gas;a phase separator configured to receive the cooled hydrocarbonaceous feed gas and to separate the condensed C3+ components as a liquid stream from a vapor stream comprising C1, C2, and nitrogen;a conduit fluidly coupled to the phase separator and configured to transport the liquid stream to a natural gas liquids recovery unit;a refluxed fractionation column configured to receive the vapor stream and to produce a nitrogen-enriched overhead product and a nitrogen-depleted bottom product;a reflux condenser configured to partially condense the nitrogen-enriched overhead product using refrigeration of a pressure-reduced first portion of the nitrogen-depleted bottom product to thereby produce a liquid reflux to the fractionation column and a gaseous nitrogen vent stream; anda natural gas liquefaction unit fluidly coupled to the refluxed fractionation column and configured to receive the first portion of the nitrogen-depleted bottom product and a second portion of the nitrogen-depleted bottom product.2. The plant of claim 1 , wherein the heat exchanger is further configured to receive and cool the vapor stream to at least partially condense the vapor stream.3. The plant of claim 1 , wherein the ...

System and Method for Separating Wide Variations in Methane and Nitrogen

A system and method for removing nitrogen and producing a high pressure methane product stream from natural gas feed streams having wide variations in nitrogen and methane content are disclosed. Optional add-on systems may be incorporated into the nitrogen and methane separation to produce an NGL sales stream to reduce excess hydrocarbons in the nitrogen vent stream, or to recover helium. The system and method of the invention are particularly suitable for use with feed streams in excess of 50 MMSCFD and up to 300 MMSCFD and containing up to 100 ppm carbon dioxide. Typical power requirements for compressing the methane product stream to produce a suitably high pressure stream for sale are reduced according to the systems and methods of the invention. 1. A system for removing nitrogen and for producing a high pressure methane product stream from a first feed stream comprising nitrogen , methane , and other components , the system comprising:a first splitter wherein the first feed stream is divided into a second feed stream and a third feed stream;a first fractionating column wherein the second feed stream and the third feed stream are separated into a first overhead stream and a first bottoms stream;a second fractionating column comprising a condenser and a reboiler, wherein first overhead stream is separated into a second overhead stream and a second bottoms stream;a first heat exchanger for cooling the first feed stream upstream of the first splitter and for cooling the second feed stream upstream of the first fractionating column through heat exchange with the first bottoms stream and the first overhead stream;an external reboiler for cooling the third feed stream upstream of the first fractionating column through heat exchange with the first bottoms stream;wherein the methane product stream comprises the first bottoms stream and second bottoms stream;wherein the second overhead stream is a nitrogen vent stream; andwherein a duty for the condenser and a duty for ...

METHOD FOR RECOVERING HELIUM

A method for recovering a helium product fraction () from a nitrogen- and helium-containing feed fraction () is described, wherein the nitrogen- and helium-containing feed fraction () is partially condensed (E), separated into a first helium-enriched fraction () and a first nitrogen-enriched fraction () and the former is cleaned again in an adsorptive manner. 2. The method according to claim 1 , characterized in that the third nitrogen-enriched fraction is at least partially work-performing expanded.3. The method according to claim 1 , characterized in that the separation column is operated under a pressure of 7 to 20 bar.4. The method according to claim 1 , characterized in that the third nitrogen-enriched fraction contains at least 50% of the nitrogen contained in the first nitrogen-enriched fraction.5. The method according to claim 1 , characterized in that at least a sub-flow of the second nitrogen-enriched fraction is evaporated against the nitrogen- and helium-containing feed fraction to be partially condensed under a pressure of less than 3 bar.6. The method according to claim 1 , characterized in that the adsorptive cleaning process is a (V)PSA and/or TSA process.7. The method according to claim 3 , characterized in that the separation column is operated under a pressure of 10 to 15 bar. The invention relates to a method for recovering a helium product fraction from a nitrogen- and helium-containing feed fraction, whereinThe term “helium product fraction” be comprised of highly purified helium, the concentration and contamination of which do not exceed a value of 100 vppm, preferably of 10 vppm.The term “nitrogen- and helium-containing feed fraction” be understood as a fraction, which contains 1 to 20 mol-% helium and 80 to 99 mol-% nitrogen. Further, this feed fraction can contain 0.1 to 2 mol-% methane and traces of hydrogen, argon and/or other noble gases.Currently, helium is obtained almost exclusively from a mixture of volatile natural gas components, ...

System and Method for Separating Wide Variations in Methane and Nitrogen

A system and method for removing nitrogen and producing a high pressure methane product stream from natural gas feed streams having wide variations in nitrogen and methane content are disclosed. Optional add-on systems may be incorporated into the nitrogen and methane separation to produce an NGL sales stream to reduce excess hydrocarbons in the nitrogen vent stream, or to recover helium. The system and method of the invention are particularly suitable for use with feed streams in excess of 50 MMSCFD and up to 300 MMSCFD and containing up to 100 ppm carbon dioxide. Typical power requirements for compressing the methane product stream to produce a suitably high pressure stream for sale are reduced according to the systems and methods of the invention. 1. A system for removing nitrogen and for producing a methane product stream from a first feed stream comprising nitrogen and methane , the system comprising:a first splitter wherein the first feed stream is divided into a second feed stream and a third feed stream;a first fractionating column wherein the second feed stream and the third feed stream are separated into a first overhead stream and a first bottoms stream;a second fractionating column comprising a condenser and a second external reboiler, wherein the first overhead stream is separated into a second overhead stream and a second bottoms stream;a third fractionating column wherein the second overhead stream is separated into a third overhead stream and a third bottoms stream;a first heat exchanger for cooling the first feed stream upstream of the first splitter and for cooling the second feed stream upstream of the first fractionating column through heat exchange with the first bottoms stream and the first overhead stream, whereby the first bottoms stream and first overhead stream are heated in the first heat exchanger;a first external reboiler for cooling the third feed stream upstream of the first fractionating column through heat exchange with the first ...

Process for liquefaction of natural gas

A process and system for production of liquefied natural gas (LNG) from natural gas. The natural gas is first partially purified by removal of water and other contaminants, followed by partial chilling to freeze some contaminants and to allow for production of a purge stream to remove other contaminants. These contaminants may be removed from the stream. The process has advantages of low cost and improved removal of contaminants.

PROCESS FOR SEPARATING HYDROCARBON COMPOUNDS

Disclosed herein are processes for producing and separating ethane and ethylene. In some embodiments, an oxidative coupling of methane (OCM) product gas comprising ethane and ethylene is introduced to a separation unit comprising two separators. Within the separation unit, the OCM product gas is separated to provide a C-rich effluent, a methane-rich effluent, and a nitrogen-rich effluent. Advantageously, in some embodiments the separation is achieved with little or no external refrigeration requirement. 155.-. (canceled)56. A system for providing Ccompounds via oxidative coupling of methane (OCM) , comprising:at least one catalytic OCM reactor system including at least one OCM catalyst to provide an OCM product gas including at least ethane, ethylene, oxygen and nitrogen, wherein each OCM reactor system includes at least a means to provide a gas mixture including at least methane and oxygen prior to introduction to at least one OCM reactor; and{'sub': 2', '2, 'a first separations system to cryogenically separate the OCM product gas into at least a C-rich effluent that includes at least one Ccompound and a gas mixture effluent that includes methane and nitrogen.'}57. The system of wherein at least a portion of the methane in the gas mixture is provided by a feedstock gas and the feedstock gas is heated to about 600° C. or less and is at a pressure of 150 pounds per square inch gauge (psig) or less.58. The system of claim 56 , further comprising:at least one OCM product gas compressor to increase the pressure of the OCM product gas to about 200 pounds per square inch gauge (psig) or more prior to the first separations system.59. The system of claim 58 , further comprising:{'sub': '2', 'at least one turboexpander to expand a first portion of the high pressure OCM product gas and to provide a mechanical shaft work output prior to separating the first portion of the OCM product gas into the C-rich effluent and the gas mixture effluent.'}60. The system of further ...

PROCESS AND APPARATUS FOR THE CRYOGENIC SEPARATION OF A MIXTURE OF CARBON MONOXIDE, HYDROGEN AND METHANE FOR THE PRODUCTION OF CH4

In a process of the separation of a mixture of carbon monoxide, hydrogen and methane, the mixture is sent to a scrubbing column, a bottom liquid withdrawn at the bottom of the scrubbing column is depleted in hydrogen with respect to the mixture and is sent to a stripping column, a bottom liquid from the stripping column is sent to a separation column and a liquid enriched in methane withdrawn from the bottom of the separation column is vaporized in order to form a final product. 1. A process for the separation of a mixture of carbon monoxide , hydrogen and methane , the process comprising the steps of:i) sending the mixture or a fluid derived from this mixture, after cooling to a cryogenic temperature in a heat exchanger, to a scrubbing column fed at the top with a liquid containing at least 80 mol % of carbon monoxide or to at least one phase separator;ii) withdrawing a bottom liquid at the bottom of the scrubbing column or of the phase separator or of one of the phase separators is depleted in hydrogen with respect to the mixture and is sent to a stripping column;iii) withdrawing a gas at the top of the stripping column;iv) sending a bottom liquid from the stripping column to a separation column; andv) withdrawing a liquid enriched in methane from the bottom of the separation column and vaporized in the heat exchanger in order to form a final product,wherein the vaporized liquid enriched in methane is compressed in a compressor and a part of the compressed gas is returned at the bottom of the separation column for separation therein.2. The process according to claim 1 , in which the part of the compressed gas is at a lower pressure than that of the compressed final product.3. The process according to claim 1 , in which the scrubbing column is fed at the top with a liquid originating from a condenser where at least a part of the gas from the top of the scrubbing column or originating from the top of the separation column or originating from a cycle for ...

Methods and systems for integration of industrial site efficiency losses to produce lng and/or lin

A method includes receiving input corresponding to a proposed configuration of a liquefaction facility and identifying a plurality of components utilized to produce LNG and/or LIN at the facility. The method includes determining an alternative configuration that is different from the proposed configuration. Determining the alternative configuration may include identifying resources accessible to a proposed location for the liquefaction facility and whether at least one of the resources accessible to the proposed location corresponds to a resource generated by a component identified by the proposed configuration, and determining whether to omit at least one component of the plurality of components identified by the proposed configuration. The method includes omitting the at least one component from the alternative configuration, and generating a report based on the proposed configuration and the alternative configuration. The report includes information indicating a difference between the proposed configuration and the alternative configuration.

METHOD FOR THE PRODUCTION OF LIQUEFIED NATURAL GAS AND NITROGEN

A method for the production of liquefied natural gas (“LNG”) and nitrogen is provided. The method may include the steps of: a) providing a nitrogen production facility, wherein nitrogen production facility comprises: a main heat exchanger, an air separation unit, a nitrogen recycle compressor, a first nitrogen refrigeration supply configured to provide refrigeration to the main heat exchanger for cooling a main air feed, b) providing a secondary refrigeration supply; c) liquefying a natural gas stream using refrigeration from the secondary refrigeration supply to form an LNG product stream; wherein the secondary refrigeration supply is configured to compress and expand a refrigerant to produce refrigeration, wherein the refrigerant of the secondary refrigeration supply is shared with refrigerant of the first nitrogen refrigeration supply 1. A method for the production of liquefied natural gas (“LNG”) and nitrogen , the method comprising the steps of:a) providing a nitrogen production facility, wherein nitrogen production facility comprises: a main heat exchanger, an air separation unit, a nitrogen recycle compressor, a first nitrogen refrigeration supply configured to provide refrigeration to the main heat exchanger for cooling a main air feed;b) providing a secondary refrigeration supply;c) liquefying a natural gas stream using refrigeration from the secondary refrigeration supply to form an LNG product stream;wherein the secondary refrigeration supply is configured to compress and expand a refrigerant to produce refrigeration, wherein the refrigerant of the secondary refrigeration supply is shared with refrigerant of the first nitrogen refrigeration supply.2. The method as claimed in claim 1 , wherein the secondary refrigeration supply comprises a third turbine-booster claim 1 , wherein the third turbine-booster has a third booster and a third turbine.3. The method as claimed in claim 2 , wherein the natural gas stream is liquefied in a secondary heat exchanger.4. ...

Recovery Of Helium From Nitrogen-Rich Streams

Overall power consumption in a cryogenic distillation process for recovering helium from nitrogen-rich gases comprising helium may be reduced if the feed to the distillation column system is at least substantially condensed by indirect heat exchange against a first bottoms liquid at first pressure, and a second bottoms liquid at a second pressure that is different from the first pressure. 1. Apparatus for recovering helium from a nitrogen-rich feed gas comprising helium , said apparatus comprising:a distillation column system for operation at an elevated operating pressure to separate at least partially condensed feed gas into helium-enriched overhead vapor and nitrogen-enriched bottoms liquid(s);an overhead condenser for partially condensing helium-enriched overhead vapor by indirect heat exchange to produce helium-enriched vapor as product and liquid for reflux in the column system;a first heat exchange system for cooling feed gas by indirect heat exchange with a first nitrogen-enriched bottoms liquid to produce cooled feed gas and vapor for the column system;a first pressure reduction device for reducing the pressure of a second nitrogen-enriched bottoms liquid to produce reduced pressure bottoms liquid;a second heat exchange system for cooling said cooled feed gas by indirect heat exchange against said reduced pressure bottoms liquid to produce at least partially condensed feed gas and vaporized bottoms liquid; anda second pressure reduction device for reducing the pressure of said at least partially condensed feed gas to produce at least partially condensed feed gas at reduced pressure for use as said feed to the distillation column system.2. The apparatus of comprising a third pressure reduction device for reducing the pressure of a third nitrogen-enriched bottoms liquid to produce reduced pressure bottoms liquid for vaporization by indirect heat exchange in said overhead condenser to produce nitrogen-enriched vapor.3. The apparatus of comprising an expander ...

INTEGRATED PROCESSES AND SYSTEMS FOR CONVERSION OF METHANE TO MULTIPLE HIGHER HYDROCARBON PRODUCTS

Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products. 1. A method of producing a plurality of hydrocarbon products , the method comprising:using an oxidative coupling of methane (OCM) catalytic reactor to convert methane and a source of oxidant to a first product gas comprising ethylene;introducing separate portions of the first product gas into a first catalytic ethylene conversion system and a second catalytic ethylene conversion system, wherein:the first catalytic ethylene conversion system reacts ethylene from the first product gas with an aromatic hydrocarbon to produce an alkylated aromatic hydrocarbon product, andthe second catalytic ethylene conversion system converts ethylene from the first product gas to a higher hydrocarbon product that is different from the alkylated aromatic hydrocarbon product produced in the first catalytic ethylene conversion system.2. The method of claim 1 , further comprising introducing an additional portion of the first product gas into a third catalytic ethylene conversion system.3. The method of claim 2 , further comprising introducing a further additional portion of the first product gas into a fourth catalytic ethylene conversion system.4. The method of claim 1 , wherein the OCM catalytic reactor comprises nanowire catalyst materials.5. The method of claim 1 , wherein the first product gas comprises 0.5 mol % to 15 mol % of ethylene.6. The method of claim 1 , wherein the first product gas comprises less than 5 mol % of ethylene.7. The method of claim 1 , wherein the first product gas comprises less than 3 mol % of ethylene.8. The method of claim 1 , wherein the first ...

METHOD FOR REMOVING NITROGEN FROM A HYDROCARBON-RICH FRACTION

A method of obtaining a liquefied hydrocarbon-rich fraction (product fraction) having a nitrogen content of ≦1 mol %, wherein the hydrocarbon-rich fraction is liquefied and subcooled with a refrigeration circuit and then subjected to a rectificative removal of nitrogen is disclosed. 2. The method as claimed in claim 1 , characterized in that the hydrocarbon-rich fraction to be liquefied has a nitrogen content of at least 2 mol %.3. The method as claimed in claim 1 , characterized in that the liquefied and subcooled hydrocarbon-rich fraction is expanded to a pressure between 1.1 and 2.0 bar.4. The method as claimed in claim 1 , characterized in that the nitrogen-enriched fraction drawn off at the top of the nitrogen stripping column is compressed to a pressure between 25 and 50 bar.5. The method as claimed in claim 1 , characterized in that the high-pressure nitrogen column is operated at a pressure between 20 and 30 bar.6. The method as claimed in claim 1 , characterized in that the amount of the reboil stream is between 10% and 70% of the amount of the compressed nitrogen-enriched fraction.7. The method as claimed in claim 1 , characterized in that the high-purity nitrogen stream drawn off from the reflux collector has a nitrogen content of at least 98 mol %.8. The method as claimed in claim 1 , characterized in that the nitrogen-enriched fraction drawn off at the top of the nitrogen stripping column has a nitrogen content between 10 and 60 mol %.9. The method as claimed in claim 1 , wherein fuel gas is required at at least one point in the method claim 1 , characterized in that the fuel gas used is a substream of the hydrocarbon-rich fraction to be liquefied and/or a substream of the compressed nitrogen-enriched fraction to be liquefied.10. The method as claimed in characterized in that the nitrogen content is at least 3 mol %.11. The method as claimed in characterized in that the pressure is between 1.15 and 1.5 bar.12. The method as claimed in characterized in ...

METHOD AND APPLIANCE FOR SEPARATING A SYNTHESIS GAS BY CRYOGENIC DISTILLATION

The invention relates to a method for separating a synthesis gas comprising hydrogen and carbon monoxide by cryogenic distillation, according to which the synthesis gas () is cleaned and cooled to a cryogenic temperature, the cooled synthesis gas is separated by a first means () in order to produce a hydrogen-depleted liquid (), the hydrogen-depleted liquid is introduced into the upper part of a stripping column () and a hydrogen-enriched gas () is drawn off at the head of the stripping column, at least partially condensed and sent back to the upper part of the stripping column. 1. A process for the separation of a synthesis gas comprising hydrogen , carbon monoxide and methane , and possibly nitrogen , by cryogenic distillation , in which:{'b': 1', '5, 'i) the synthesis gas (, ) is purified and cooled down to a cryogenic temperature,'}{'b': 9', '15', '91', '15, 'ii) the cooled synthesis gas is separated by a first means (, ) in order to produce a liquid depleted in hydrogen (), the separation carried out by the first means consists of a stage of scrubbing in a scrubbing column () with at least a part of the liquid enriched in methane withdrawn from a column for the separation of carbon monoxide and methane having an overhead condenser, the condenser being cooled by a carbon monoxide cycle, and'}{'b': '25', 'iii) the liquid depleted in hydrogen is introduced into the upper part of a stripping column () which also comprises a lower part,'}{'b': 27', '29, 'iv) a gas enriched in hydrogen (, ) is withdrawn at the top of the stripping column,'}{'b': 33', '45', '43', '77', '29, 'v) a liquid () is withdrawn at the bottom of the stripping column and sent to the separation column (), a gas () enriched in carbon monoxide and depleted in methane is withdrawn at the top of the separation column, a liquid () depleted in carbon monoxide and enriched in methane is withdrawn at the bottom of the separation column and the gas enriched in carbon monoxide is heated by heat exchange ...

Method of natural gas pretreatment

A method of natural gas treatment including introducing a natural gas containing stream into a dryer unit, thereby producing a treated natural gas containing stream. Introducing the treated natural gas containing stream into a nitrogen rejection unit, thereby producing a further treated natural gas stream as a nitrogen rejection unit product. Splitting the nitrogen rejection unit product into at least two portions, introducing the first portion of the further treated natural gas stream into a reformer unit as first part of feed, and introducing a second portion of the further treated natural gas stream into the dryer unit as a regeneration stream, thereby producing a regeneration waste stream. Introducing at least a portion of the regeneration waste stream into the reformer unit as second part of feed.

Facility For Producing Gaseous Biomethane By Purifying Biogas From Landfill Combining Membranes, Cryodistillation And Deoxo

A process and facility for producing gaseous methane by purifying biogas from landfill can include a VOC purification unit, at least one membrane, a CO2 purification unit, a cryodistillation unit comprising a heat exchanger and a distillation column, a deoxo, and a dryer.

Hydrocarbon Gas Processing

A process and an apparatus are disclosed for a compact processing assembly to improve the recovery of C(or C) and heavier hydrocarbon components from a hydrocarbon gas stream. The preferred method of separating a hydrocarbon gas stream generally includes producing at least a substantially condensed first stream and a cooled second stream, expanding both streams to lower pressure, and supplying the streams to a fractionation tower. In the process and apparatus disclosed, the tower overhead vapor is directed to an absorbing means and a heat and mass transfer means inside a processing assembly. A portion of the outlet vapor from the processing assembly is compressed to higher pressure, cooled and substantially condensed in a heat exchange means inside the processing assembly, then expanded to lower pressure and supplied, to the heat and mass transfer means to provide cooling. Condensed liquid from the absorbing means is fed to the tower. 1. In a process for the separation of a gas stream containing methane , Ccomponents , Ccomponents , and heavier hydrocarbon components into a volatile residue gas fraction and a relatively less volatile traction containing a major portion of said Ccomponents , Ccomponents , and heavier hydrocarbon components or said Ccomponents and heavier hydrocarbon components , in which process '(b) said substantially condensed first stream is expanded to a lower pressure whereby it is further cooled, and thereafter supplied at a top feed position on a distillation column that produces at least an overhead vapor stream and a bottom liquid stream;', '(a) said gas stream is treated in one or more heat exchange steps and at least one division step to produce at least a first stream that has been cooled under pressure to condense substantially all of it, and at least a second stream that has been cooled under pressure;'}(c) said cooled second stream is expanded to said lower pressure, and thereafter supplied to said distillation column at a mid-column ...

Hydrocarbon Gas Processing

A process and an apparatus are disclosed for a compact processing assembly to improve the recovery of C(or C) and heavier hydrocarbon components from a hydrocarbon gas stream. The preferred method of separating a hydrocarbon gas stream generally includes producing at least a substantially condensed first stream and a cooled second stream, expanding both streams to lower pressure, and supplying the streams to a fractionation tower. In the process and apparatus disclosed, the tower overhead vapor is directed to an absorbing means and a heat and mass transfer means inside a processing assembly. A portion of the outlet vapor from the processing assembly is compressed to higher pressure, cooled and substantially condensed in a heat exchange means inside the processing assembly, then expanded to lower pressure and supplied to the heat and mass transfer means to provide cooling. Condensed liquid from the absorbing means is fed to the tower. 1. In a process for the separation of a gas stream containing methane , Ccomponents , Ccomponents , and heavier hydrocarbon components into a volatile residue gas fraction and a relatively less volatile fraction containing a major portion of said Ccomponents , Ccomponents , and heavier hydrocarbon components or said Ccomponents and heavier hydrocarbon components , in which process(a) said gas stream is treated in one or more heat exchange steps and at least one division step to produce at least a first stream that has been cooled under pressure to condense substantially all of it, and at least a second stream that has been cooled under pressure;(b) said substantially condensed first stream is expanded to a lower pressure whereby it is further cooled, and thereafter supplied at a top feed position on a distillation column that produces at least an overhead vapor stream and a bottom liquid stream;(c) said cooled second stream is expanded to said lower pressure, and thereafter supplied to said distillation column at a mid-column feed ...

Hydrocarbon Gas Processing

A process and an apparatus are disclosed for a compact processing assembly to improve the recovery of C(or C) and heavier hydrocarbon components from a hydrocarbon gas stream. The preferred method of separating a hydrocarbon gas stream generally includes producing at least a substantially condensed first stream and a cooled second stream, expanding both streams to lower pressure, and supplying the streams to a fractionation tower. In the process and apparatus disclosed, the tower overhead vapor is directed to an absorbing means and a heat and mass transfer means inside a processing assembly. A portion of the outlet vapor from the processing assembly is compressed to higher pressure, cooled and substantially condensed in a heat exchange means inside the processing assembly, then expanded to lower pressure and supplied to the heat and mass transfer means to provide cooling. Condensed liquid from the absorbing means is fed to the tower. 1. In a process for the separation of a gas stream containing methane , Ccomponents , Ccomponents , and heavier hydrocarbon components into a volatile residue gas fraction and a relatively less volatile fraction containing a major portion of said Ccomponents , Ccomponents , and heavier hydrocarbon components or said Ccomponents and heavier hydrocarbon components , in which process(a) said gas stream is treated in one or more heat exchange steps and at least one division step to produce at least a first stream that has been cooled under pressure to condense substantially all of it, and at least a second stream that has been cooled under pressure;(b) said substantially condensed first stream is expanded to a lower pressure whereby it is further cooled, and thereafter supplied at a top feed position on a distillation column that produces at least an overhead vapor stream and a bottom liquid stream;(c) said cooled second stream is expanded to said lower pressure, and thereafter supplied to said distillation column at a mid-column feed ...

NATURAL GAS LIQUEFACTION WITH INTEGRATED NITROGEN REMOVAL

A natural gas liquefaction method and system having integrated nitrogen removal. Recycled LNG gas is cooled in a separate and parallel circuit from the natural gas stream in the main heat exchanger. Cooled recycled gas and natural gas streams are directed to a nitrogen rectifier column after the warm bundle. The recycle stream is introduced to the rectifier column above the natural gas stream and at least one separation stage is located in the rectifier column between the recycle stream inlet and the natural gas inlet. The bottom stream from the rectifier column is directed to a cold bundle of the main heat exchanger where it is subcooled. 1. A method for producing a nitrogen-depleted LNG product , the method comprising:(a) passing a natural gas feed stream through a first circuit of a main heat exchanger to cool the natural gas feed stream and liquefy at least a portion of the natural gas stream against a first refrigerant, thereby producing a first cooled LNG stream;(b) withdrawing the first cooled LNG stream from the main heat exchanger;(c) expanding the first cooled LNG stream to form a first reduced pressure LNG stream;(d) introducing the first reduced pressure LNG stream into a nitrogen rectifier column at a first location, the first location being located at a bottom end of the nitrogen rectifier column;(e) withdrawing a first LNG bottoms stream from the bottom end of the nitrogen rectifier column;(f) withdrawing an overhead stream from the nitrogen rectifier column;(g) cooling the first LNG bottoms stream to create a subcooled LNG stream;(h) directing at least a portion of the subcooled LNG stream to a flash drum or an LNG storage tank;(i) collecting at least one selected from the group of: a flash gas stream from the flash drum and a boil-off gas stream from the LNG storage tank to form a recycle stream;(j) passing the recycle stream through a second circuit of the main heat exchanger to cool the recycle stream and liquefy at least a portion of the recycle ...

Method and system to control the methane mass flow rate for the production of liquefied methane gas (lmg)

The system is provided for generating a mixed methane gas feed stream using at least one source of biogas and an alternate source of methane gas. The system includes a biogas subsystem, a control device for the methane gas from the at least one alternate source of methane gas, and a vertically-extending gas mixing vessel. A method of controlling a methane gas mass flow rate of a mixed methane gas feed stream is also disclosed. The proposed concept is particularly well adapted for situations where an uninterrupted and relatively constant input of methane gas is required to ensure an optimum operation of, for instance, a LMG production plant.

System and Method for Separating Natural Gas Liquid and Nitrogen from Natural Gas Streams

A system and method for removing nitrogen and producing a high pressure methane product stream and an NGL product stream from natural gas feed streams where at least 90%, and preferably at least 95%, of the ethane in the feed stream is recovered in the NGL product stream. The system and method of the invention are particularly suitable for use with feed streams in excess of 5 MMSCFD and up to 300 MMSCFD and containing around 5% to 80% nitrogen. The system and method preferably combine use of strategic heat exchange between various process streams with a high pressure rectifier tower and the ability to divert all or a portion of a nitrogen rejection unit feed stream to optionally bypass a nitrogen fractionation column to reduce capital costs and operating expenses. 1. A system for removing nitrogen from a feed stream comprising nitrogen , methane , ethane , and other components to produce a methane product stream , an NGL product stream , and a nitrogen vent stream the system comprising:a first separator wherein the feed stream is separated into a first overhead stream and a first bottoms stream;a first fractionating column wherein the first overhead stream is separated into a second overhead stream and a second bottoms stream;an expander for expanding the first overhead stream prior to the first fractionating column;a second fractionating column wherein the first bottoms stream and second bottoms stream are separated into a third overhead stream and a third bottoms stream;a third fractionating column wherein at least a first NRU feed stream separated into a fourth overhead stream and a fourth bottoms stream;a first heat exchanger for cooling a first portion of the feed stream prior to the first separator and cooling a first portion of the second overhead stream prior to the third fractionating column through heat exchange with the fourth bottoms stream and a recycle refrigerant stream;a second heat exchanger for cooling the first portion of the second overhead ...

METHOD AND APPARATUS FOR THE CRYOGENIC SEPARATION OF A SYNTHESIS GAS CONTAINING A NITROGEN SEPARATION STEP

A method for separating a gas mixture comprising carbon monoxide, nitrogen and hydrogen involves sending a hydrogen-depleted fluid to a denitrification column (K) having a top condenser (C) and a bottom reboiler (R) in order to produce a nitrogen-enriched gas at the top of the column and a nitrogen-depleted liquid at the bottom of the column, cooling the condenser of the denitrification column by means of a nitrogen cycle using a nitrogen compressor (V, V, V), vaporising, in the heat exchanger of the condenser, the liquid nitrogen () from the nitrogen cycle, and returning the nitrogen () vaporised in the heat exchanger to the nitrogen compressor. 113.-. (canceled)14. A process for separating a gas mixture comprising carbon monoxide , nitrogen , hydrogen , and methane , the method comprising:i) cooling the gas mixture in a heat exchanger,ii) separating the gas mixture cooled in the heat exchanger by at least one scrubbing and/or distillation and/or partial condensation step, to form a hydrogen-depleted fluid containing carbon monoxide and nitrogen,iii) introducing the hydrogen-depleted fluid into a denitrification column comprising a column top, a top condenser, a column bottom, and a bottom reboiler, thereby producing a nitrogen-enriched gas at the column top and a nitrogen-depleted liquid at the column bottom,iv) cooling the top condenser by means of a nitrogen cycle using a nitrogen compressor comprising at least a first stage and a second stage, the first stage comprising a first entry pressure and the second stage comprising a second entry pressure, the first entry pressure being lower than that of the second entry pressure,v) expanding the nitrogen-depleted liquid and sending the expanded nitrogen-depleted liquid to the top condenser wherein it is at least partially vaporized by heat exchange in the condenser with the nitrogen-enriched gas, thereby condensing the expanded nitrogen-depleted liquid, a) sending the bottom liquid from the denitrification column to ...

SYSTEM AND METHOD FOR CRYOGENIC PURIFICATION OF A FEED STREAM COMPRISING HYDROGEN, METHANE, NITROGEN AND ARGON

A system and method for cryogenic purification of a hydrogen, nitrogen, methane and argon containing feed stream to produce a methane free, hydrogen and nitrogen containing synthesis gas and a methane rich fuel gas, as well as to recover an argon product stream, excess hydrogen, and excess nitrogen is provided. The disclosed system and method are particularly useful as an integrated cryogenic purifier in an ammonia synthesis process in an ammonia plant. The excess nitrogen is a nitrogen stream substantially free of methane and hydrogen that can be used in other parts of the plant, recovered as a gaseous nitrogen product and/or liquefied to produce a liquid nitrogen product. 1. A method for purifying a hydrogen , nitrogen , methane and argon containing feed stream to produce a hydrogen and nitrogen containing synthesis gas and a methane fuel gas , the method comprising the steps of:conditioning the feed stream to a temperature near saturation at a pressure greater than about 300 psia;directing the conditioned feed stream to a synthesis gas rectification column configured to produce an hydrogen and nitrogen enriched overhead vapor stream and a methane-rich condensed phase stream proximate the bottom of the synthesis gas rectification column;directing the methane-rich condensed phase stream to a hydrogen stripping column configured to strip hydrogen from the methane-rich condensed phase stream and produce a hydrogen free methane bottom stream and a hydrogen enriched gaseous overhead;vaporizing the hydrogen free methane bottom stream to produce a vaporized or partially vaporized hydrogen free methane-rich stream;warming the hydrogen and nitrogen enriched overhead vapor stream via indirect heat exchange with the feed stream to produce the hydrogen and nitrogen containing synthesis gas; andwarming the vaporized or partially vaporized hydrogen free methane-rich stream via indirect heat exchange with the feed stream to produce the methane fuel gas.2. The method of claim 1 , ...

SYSTEM AND METHOD FOR CRYOGENIC PURIFICATION OF A FEED STREAM COMPRISING HYDROGEN, METHANE, NITROGEN AND ARGON

A system and method for cryogenic purification of a hydrogen, nitrogen, methane and argon containing feed stream to produce a methane free, hydrogen and nitrogen containing synthesis gas and a methane rich fuel gas, as well as to recover an argon product stream, excess hydrogen, and excess nitrogen is provided. The disclosed system and method are particularly useful as an integrated cryogenic purifier in an ammonia synthesis process in an ammonia plant. The excess nitrogen is a nitrogen stream substantially free of methane and hydrogen that can be used in other parts of the plant, recovered as a gaseous nitrogen product and/or liquefied to produce a liquid nitrogen product. 1. A method for purifying a stream comprising hydrogen , nitrogen , methane and argon to produce a hydrogen and nitrogen containing synthesis gas , a methane rich fuel gas , and at least one nitrogen product , the method comprising the steps of:conditioning the pre-purified feed stream to a temperature near saturation at a pressure greater than about 300 psia;directing the conditioned feed stream to a synthesis gas rectification column configured to produce an hydrogen and nitrogen enriched overhead vapor stream and a methane-rich condensed phase stream proximate the bottom of the synthesis gas rectification column;vaporizing the methane-rich condensed phase stream to produce a vaporized or partially vaporized methane-rich stream;directing the vaporized or partially vaporized methane-rich stream and a nitrogen reflux stream to a nitrogen rectification column configured to produce a nitrogen containing overhead vapor stream substantially free of methane, and a methane enriched liquid bottoms stream;warming at least a portion of the nitrogen containing overhead vapor stream via indirect heat exchange with the feed stream to produce a warm gaseous nitrogen stream and directing the warm gaseous nitrogen stream to a nitrogen recovery system to produce the at least one nitrogen product;warming the ...

SYSTEM AND METHOD FOR CRYOGENIC PURIFICATION OF A FEED STREAM COMPRISING HYDROGEN, METHANE, NITROGEN AND ARGON

A system and method for cryogenic purification of a hydrogen, nitrogen, methane and argon containing feed stream to produce a methane free, hydrogen and nitrogen containing synthesis gas and a methane rich fuel gas, as well as to recover an argon product stream, excess hydrogen, and excess nitrogen is provided. The disclosed system and method are particularly useful as an integrated cryogenic purifier in an ammonia synthesis process in an ammonia plant. The excess nitrogen is a nitrogen stream substantially free of methane and hydrogen that can be used in other parts of the plant, recovered as a gaseous nitrogen product and/or liquefied to produce a liquid nitrogen product. 1. A cryogenic purification system configured for purifying a hydrogen , nitrogen , methane and argon containing feed stream , the system comprising:a synthesis gas rectification column configured to receive the feed stream and produce a hydrogen and nitrogen enriched overhead vapor stream and a methane-rich condensed phase stream proximate the bottom of the synthesis gas rectification column;a hydrogen stripping column configured to receive the methane-rich condensed phase stream from the synthesis gas rectification column, strip hydrogen from the methane-rich condensed phase stream and produce a hydrogen free methane bottom stream and a hydrogen enriched gaseous overhead;a condenser configured to receive the hydrogen free methane bottom stream and a working fluid and to produce a vaporized or partially vaporized hydrogen free methane-rich stream; anda heat exchanger configured to (a) warm the hydrogen and nitrogen enriched overhead vapor stream via indirect heat exchange with the feed stream to produce a hydrogen and nitrogen containing synthesis gas; and (b) to warm the vaporized or partially vaporized hydrogen free methane-rich stream via indirect heat exchange with the feed stream to produce a methane fuel gas.2. The system of claim 1 , further comprising a compressor disposed upstream of ...

METHOD FOR DISTILLING A GAS STREAM CONTAINING OXYGEN

A process for producing biomethane by scrubbing a biogas feed stream includes introducing the feed gas stream into a pretreatment unit wherein a CO-depleted gas stream is partially separated from a COstream and an oxygen stream and is compressed to a pressure P1 above 25 bar abs. Subjecting the CO-depleted gas stream to cryogenic separation in a distillation column to separate a nitrogen stream and produce a CH-enriched stream, the distillation column comprising n plates, n being an integer between 8 and 100. Recovering a pressurized CH-enriched stream by pumping the CO-depleted gas stream to a pressure P2 above 25 bar absolute. 110-. (canceled)12. The process of claim 11 , wherein when C1 is greater than 0.5 mol % and less than or equal to 1 mol % claim 11 , the CO-depleted gas stream is introduced into the distillation column at the level of plate n claim 11 , plate n being the plate that is positioned the highest in said column.13. The process of claim 11 , wherein n is between 15 and 100 and wherein when C1 is less than or equal to 0.1 mol % claim 11 , the CO-depleted gas stream is introduced into the distillation column at a level between plate n-10 and plate n-5 claim 11 , platen being the plate that is positioned the highest in said column.14. The process of claim 11 , wherein P1 is greater than 50 bar absolute.15. The process of claim 11 , wherein step a) further comprises scrubbing the water from the gas stream compressed to the pressure P1.16. The process of claim 11 , wherein the separation of the COand of the oxygen from the feed gas stream is performed by a unit comprising at least two separating membrane stages.17. The process of claim 11 , wherein the pressure P2 is greater than 40 bar abs.18. The process of claim 11 , wherein claim 11 , during step b) claim 11 , the CO-depleted gas stream undergoes an expansion to a pressure P3 of between 15 bar abs and 40 bar abs prior to being introduced into said distillation column.19. The process of claim 11 , ...

METHOD FOR PRODUCING PURE NITROGEN FROM A NATURAL GAS STREAM CONTAINING NITROGEN

A process for liquefying a natural gas feed stream including cooling a feed gas stream to obtain a liquefied natural gas stream; introducing the liquefied natural gas stream into a deazotization column to produce a liquefied natural gas stream and a nitrogen-enriched vapor stream; at least partially condensing at least part of the nitrogen-enriched vapor stream to produce a two-phase stream; introducing the two-phase stream into a phase-separating vessel to produce a first liquid stream and a first nitrogen-enriched gas stream; introducing at least part of the nitrogen-enriched gas stream into a distillation column thereby producing a second nitrogen-enriched stream containing less than 1 mol % of methane and a second liquid stream containing less than 10 mol % of nitrogen; wherein at least part of the liquefied natural gas stream is used to cool the at least part of the nitrogen-enriched vapor stream in said heat exchanger. 113.-. (canceled)15. The process of claim 14 , wherein the natural gas feed stream and a second coolant mixture are cooled by indirect heat exchange with at least one first coolant mixture to obtain a cooled natural gas and a second cooled coolant mixture claim 14 , and the cooled natural gas is then condensed and cooled by indirect heat exchange with at least the second cooled coolant mixture to obtain a liquefied natural gas.16. The process of claim 14 , wherein the second nitrogen-enriched stream contains less than 100 molar ppm of methane and the second liquid stream contains less than 4 mol % of nitrogen.172. The process of claim 14 , wherein the liquefied natural gas stream is cooled in a reboiling means of said deazotization column down to the temperature T.182. The process of claim 14 , wherein the stream cooled to the temperature T is expanded in an expansion means before being introduced into the deazotization column.19. The process of claim 14 , wherein at least part of the first liquid stream is used as reflux at the top of the ...

PROCESS FOR REMOVING NITROGEN FROM HIGH-FLOW NATURAL GAS

A process for separating the components of a gas mixture comprising methane, nitrogen, and at least one hydrocarbon having at least two carbon atoms, or a mixture of these hydrocarbons, including the following steps: a) introduction of a stream of the mixture to be treated into a demethanization of the gas mixture with at least N demethenization column; b) partial condensation of a gas mixture, comprising less than 1 mol % of hydrocarbons having at least two carbon atoms, extracted from the demethanization unit to obtain a liquid, at least a portion of which is treated in order to be extracted as denitrogenated natural gas and a second gas, c) introduction of the second gas into a nitrogen removal unit having N nitrogen removal columns. 16-. (canceled)8. The process as claimed in claim 7 , further comprising the additional step:d) treating said gas from step c) in a second nitrogen removal unit in order to produce a gaseous nitrogen stream comprising at most 2 mol % of methane and a gaseous methane stream comprising at most 5 mol % of nitrogen.9. The process as claimed in claim 8 , wherein the second nitrogen removal unit (B) comprises at most N−1 nitrogen removal columns.10. The process as claimed in claim 7 , wherein N is greater than or equal to 6.11. The process as claimed in claim 10 , wherein the second nitrogen removal unit comprises between N−5 nitrogen removal columns and N−1 nitrogen removal columns.12. The process as claimed in claim 7 , wherein the steps b) and c) are carried out at a temperature below −50° C. and the fluid is not reheated above −50° C. between step b) and step c). This application is a 371 of International PCT Application PCT/FR2015/052632, filed Oct. 1, 2015, which claims priority to French Patent Application No. 1552781, filed Apr. 1, 2015, the entire contents of which are incorporated herein by reference.The present invention relates to a process for separating the components of a gas mixture containing methane, nitrogen and ...

Integrated processes and systems for conversion of methane to multiple higher hydrocarbon products

Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products.

Helium Extraction from Natural Gas

A helium-containing stream is recovered from a natural gas feed using a membrane followed by multiple distillation steps. Refrigeration is provided by expanding a bottoms liquid with a higher nitrogen content than the feed, achieving a lower temperature in the process. The helium-enriched vapor is then purified and the helium-containing waste stream is recycled to maximize recovery and reduce the number of compressors needed. The helium-depleted natural gas stream can be returned at pressure for utilization or transportation.

METHOD AND ARRANGEMENT FOR PRODUCING LIQUEFIED METHANE GAS (LMG) FROM VARIOUS GAS SOURCES

The method is carried out for continuously producing a liquefied methane gas (LMG) from a pressurized mixed methane gas feed stream. It is particularly well adapted for use in relatively small LMG distributed production plant, for instance those ranging from 400 to 15,000 MT per year, and/or when the mixed methane gas feed stream has a wide range of nitrogen-content proportions, including nitrogen being substantially absent. The proposed concept can also be very useful in the design of medium-scale and/or large-size plants, including ones where the nitrogen content always remains above a certain threshold. The methods and arrangements proposed herein can mitigate losses of methane gas when venting nitrogen, for instance in the atmosphere. 1. A method of continuously producing a liquefied methane gas (LMG) from a pressurized mixed methane gas feed stream , the mixed methane gas feed stream containing methane and a variable concentration of nitrogen within a range that includes nitrogen being substantially absent from the mixed methane gas feed stream , the method including the simultaneous steps of:(A) passing the mixed methane gas feed stream through a first heat exchanger and then through a second heat exchanger to condense at least a portion of the mixed methane gas feed stream, the first heat exchanger using a first cryogenic refrigerant and the second heat exchanger using a second cryogenic refrigerant;(B) sending the mixed methane gas feed stream coming out of the second heat exchanger though a mid-level inlet of a fractional distillation column;(C) when nitrogen is present in the mixed methane gas feed stream, separating the mixed methane gas feed stream inside the fractional distillation column into a methane-rich liquid fraction and a nitrogen-rich gas fraction;(D) withdrawing the methane-rich liquid fraction accumulating at a bottom of the fractional distillation column through a bottom outlet, the methane-rich liquid fraction constituting the LMG;(E) ...

NITROGEN RECOVERY APPARATUS AND METHOD OF RECOVERING NITROGEN

A nitrogen recovery apparatus for recovering nitrogen from natural gas comprises a separator having a liquid fraction port and a vapour fraction port in fluid communication with a split flow arrangement, the split flow arrangement having a sub-cooled fluid path and an expanded fluid path. A fractionating column has a reflux inlet port in fluid communication with the subcooled fluid path above a middle feed port thereof, the middle feed port being in fluid communication with the expanded fluid path. A bottom feed port of the fractionating column is in fluid communication with the liquid fraction port of the separator. A side reboiler circuit and a reboiler circuit are operably coupled to the fractionating column below the bottom feed port. A bottom hydrocarbon product stream path is in fluid communication with a bottom hydrocarbon port of the fractionating column. 1100100. A nitrogen recovery apparatus () for recovering nitrogen from natural gas , the apparatus () comprising:{'b': 110', '112', '112', '118', '120, 'a separator () having a liquid fraction port and a vapour fraction port in fluid communication with a split flow arrangement (), the split flow arrangement () having a sub-cooled fluid path () and an expanded fluid path ();'}{'b': 116', '124', '118', '130', '130', '120, 'a fractionating column () having a reflux inlet port () in fluid communication with the subcooled fluid path () above a middle feed port () thereof, the middle feed port () being in fluid communication with the expanded fluid path ();'}{'b': 114', '116', '110, 'a bottom feed port () of the fractionating column () in fluid communication with the liquid fraction port of the separator ();'}{'b': 132', '116', '114, 'a side reboiler circuit () operably coupled to the fractionating column () below the bottom feed port ();'}{'b': 140', '116', '132, 'a reboiler circuit () operably coupled to the fractionating column () below the side boiler circuit (); and'}{'b': 160', '162', '116, 'a bottom ...

Plate heat exchanger condenser-evaporator and process for low-temperature air separation

A plate heat exchanger condenser-evaporator with a heat-exchanger block having a number of heat-exchanger plates with fluid-conducting structures. The heat-exchanger block includes first and second outer surface opposite each other, and third and fourth outer surface opposite each other. The fluid-conducting structures of first heat-exchanger plates have first and second openings not covered by fluid feed or fluid-collecting lines. The fluid-conducting structures of second heat-exchanger plates run between a fluid feed line and a fluid-collecting line each arranged on the heat-exchanger block. The fluid feed line may be on the first outer surface with first openings of the fluid-conducting structures of the first heat-exchanger plates in a region of the first outer surface not covered by the fluid feed line or in a first region of the third outer surface and fourth outer surface. A process for low-temperature air separation is also described. 1. Plate heat exchanger condenser-evaporator having a heat-exchanger block which comprises a number of heat-exchanger plates having fluid-conducting structures , wherein the heat-exchanger block comprises a first outer surface , a second outer surface opposite the first outer surface , a third outer surface and a fourth outer surface opposite the third outer surface , wherein the fluid-conducting structures of first heat-exchanger plates comprise first and second openings on the heat-exchanger block , which openings are not covered by fluid feed lines or by fluid-collecting lines , and wherein the fluid-conducting structures of second heat-exchanger plates run between a fluid feed line arranged on the heat-exchanger block and a fluid-collecting line arranged on the heat-exchanger block , characterized in that the fluid feed line is arranged on the first outer surface and in that the first openings of the fluid-conducting structures of the first heat-exchanger plates are arranged either in a region of the first outer surface ...

SYSTEM AND METHOD FOR ARGON RECOVERY FROM THE TAIL GAS OF AN AMMONIA PRODUCTION PLANT

A system and method for argon and nitrogen extraction and liquefaction from a low-pressure tail gas of an ammonia production plant is provided. The preferred tail gas of the ammonia production plant comprises methane, nitrogen, argon, and hydrogen. The disclosed system and method provides for the methane rejection via rectification and hydrogen rejection by way of a side stripper column or phase separator. The resulting nitrogen and argon containing stream is separated and liquefied in a double column distillation system. 1. A method for separating a feed gas comprising hydrogen , nitrogen methane and argon , the method comprising the steps of:conditioning the feed gas to a near saturated vapor state at a pressure of less than or equal to about 150 psia and a temperature near saturation;providing the conditioned feed gas to a rectification column;separating the conditioned feed gas in a rectification column to produce a methane-rich liquid column bottoms; an argon-depleted, hydrogen-nitrogen gas overhead; and an argon-rich side draw, the argon-rich side draw comprising trace amounts of hydrogen;removing the argon-rich side draw with trace amounts of hydrogen from an intermediate location of the rectification column as an argon-rich stream;directing the argon-rich stream to a hydrogen rejection arrangement;stripping the trace amounts of hydrogen from the argon-rich stream in the hydrogen stripping arrangement to produce an argon depleted stream and a hydrogen-free, nitrogen and argon containing stream; andseparating the argon from the hydrogen-free, nitrogen and argon containing stream in at least one distillation column to produce an argon product.2. The method of claim 1 , wherein the feed gas is a tail gas from an ammonia plant.3. The method of claim 1 , wherein the feed gas contains greater than about 50% nitrogen by mole fraction.4. The method of wherein the conditioned feed gas is at a pressure of less than or equal to about 50 psia.5. The method of claim 1 , ...

METHODS AND SYSTEMS FOR REMOVING NITROGEN FROM NATURAL GAS

Methods and systems for producing a product natural gas employing a natural gas liquids (NGL) recovery unit followed by removing nitrogen in a nitrogen rejection unit (NRU) operatively connected with the NGL recovery unit by a pressure management sub-system (PMSS). In one embodiment, the PMSS includes a first conduit fluidly connecting the top of a demethanizer column (or an existing conduit connected to the top of the demethanizer) to a separator, a second conduit fluidly connecting the separator to a pump, the pump connected to a distillation column in the NRU by a third conduit, in another embodiment, the PMSS includes a first conduit fluidly connecting an NGL expander to a separator, allowing natural gas vapors and nitrogen to be fed to the NRU column through a second conduit. Alternatively, the PMSS allows mixture from the NGL recovery unit expander to be fed directly via the first conduit to the NRU distillation column. 1. A system comprising:(a) a natural gas liquids (NGL) recovery unit;(b) a nitrogen rejection unit (NRU); and (i) a demethanizer column overhead to one or more heat exchangers and then to a separator,', '(ii) the separator to a pump, the pump having a pump outlet;', '(iii) the pump outlet with a lower section of an NRU distillation column;', '(iv) the NRU distillation column bottoms to an expansion valve;', '(v) the expansion valve with the one or more heat exchangers;', '(vi) the separator overhead to a point of the fifth conduit downstream of the expansion valve and upstream of the one or more heat exchangers; and', '(vii) the point of the fifth conduit to the one or more heat exchangers and then to an NGL recovery unit heat exchanger network., '(c) a pressure management sub-system (PMSS) operatively and fluidly connecting the NGL recovery unit and the NRU, the PMSS comprising a set of conduits, individual members of the set of conduits fluidly connecting2. The system of wherein the separator and the pump are configured so that the ...

Air separation apparatus and an integrated gasification combined cycle apparatus incorporating the air separation apparatus

An air separation unit produces and supplies nitrogen gas used in gasification furnace facility and/or gas purification facility from material air and supplies oxygen-rich waste gas to air compressor installed in gasification furnace facility, and introduces it as part of the gasification agent in gasification furnace after being pressurized together with air in air compressor.

A METHOD AND APPARATUS FOR SEPARATING A LIQUEFIABLE GAS MIXTURE

The invention relates to a method for separating a liquefiable gas mixture consisting of a plurality of components, comprising at least one first component (K) and one second component (K), wherein, under an increased pressure p, the first component (K) has a melting point T*that is higher than the melting point T*of the second component (K). In order to realise a configuration that is as compact as possible, it is provided in accordance with the invention that the method comprises the following steps: 11212. A method for separating a liquefiable gas mixture comprising a plurality of components , comprising at least one first component (K) and one second component (K) , wherein , under an increased pressure p , the first component (K) has a melting point T*that is higher than the melting point T*of the second component (K) , wherein the method comprises the following steps:{'sub': 0', '0', 'K2', '0', 'K1', '0', '1', '0', '0, 'b': 1', '2', '1', '0, 'converting the gas mixture to a liquid state at a temperature Tand a pressure P, e.g. by liquefying and subsequently cooling the gas mixture, wherein T* Подробнее

CRYOGENIC PROCESS FOR REMOVING NITROGEN FROM A DISCHARGE GAS

A process for producing biomethane by scrubbing a biogas feed stream including introducing a feed gas stream into a pretreatment unit wherein the gas stream is partially separated from a COstream and an oxygen stream, thereby producing a CO-depleted gas stream, which is compressed, thereby producing a pressurized CO-depleted gas stream; separating the pressurized CO-depleted gas stream by cryogenic separation by introducing the pressurized CO-depleted gas stream into a distillation column thereby producing a nitrogen stream and a CH-enriched stream, recovering a pressurized CH-enriched stream by pumping the CH-enriched stream; wherein the separation of the COstream and the oxygen stream from the feed gas stream is performed by a unit comprising at least two separating membrane stages in order that the CO-depleted gas stream comprises between 0.3 mol % and 2 mol % of CO. 18.-. (canceled)10. The process of claim 9 , further comprising scrubbing water from the pressurized CO-depleted gas stream.11. The process of claim 9 , wherein P1 is greater than 50 bar absolute.12. The process of claim 9 , wherein the pressure P2 is greater than 40 bar abs.13. The process of claim 9 , wherein the CO-depleted gas stream undergoes an expansion to a pressure P3 of between 15 bar abs and 40 bar abs prior to being introduced into said distillation column.14. The process of claim 13 , wherein prior to the expansion claim 13 , the CO-depleted gas stream is at least partially condensed in a heat exchanger.15. The process of claim 14 , wherein the CO-depleted gas stream is at least partially condensed in a heat exchanger counter-currentwise relative to the CH-enriched stream and to at least part of the nitrogen stream. This application is a 371 of International Application No. PCT/FR2018/053338, filed Dec. 17, 2018, which claims priority to French Patent Application No. 1762858, filed Dec. 21, 2017, the entire contents of which are incorporated herein by reference.The invention relates to a ...

System and Method for Separating Methane and Nitrogen with Reduced Horsepower Demands

A system and method for removing nitrogen from natural gas using two fractionating columns, that may be stacked, and a plurality of separators and heat exchangers, with horsepower requirements that are 50-80% of requirements for prior art systems. The fractionating columns operate at different pressures. A feed stream is separated with a vapor portion feeding the first column to produce a first column bottoms stream that is split into multiple portions at different pressures and first column overhead stream that is cooled and separated into vapor and liquid portions to control subcooling of the vapor portion prior to feeding the second column. Heat exchange between first column and second column streams provides first column reflux and reboil heat for a second column ascending vapor stream. Three sales gas streams are produced, each at a different pressure. 1. A system for removing nitrogen and for producing a methane product stream from a feed stream comprising nitrogen , methane , and other components , the system comprising:a first separator wherein the feed stream is separated into a first separator overhead stream and a first separator bottoms stream;a first splitter for splitting the first separator overhead stream into a first portion and a second portion;a first fractionating column wherein the first and second portions of the first separator overhead stream are separated into a first column overhead stream and a first column bottoms stream;a second splitter for splitting the first column bottoms stream into four portions;a second fractionating column wherein the first column overhead stream is separated into a second column overhead stream and a second column bottoms stream;a second separator wherein the second column bottoms stream and a fourth portion of the first column bottoms stream are separated into a second separator overhead stream and a second separator bottoms stream;a first mixer to mix the second separator bottoms stream and a third portion of ...

System and Method for Separating Methane and Nitrogen with Reduced Horsepower Demands

A system and method for removing nitrogen from natural gas using two fractionating columns, that may be stacked, and a plurality of separators and heat exchangers, with horsepower requirements that are 50-80% of requirements for prior art systems. The fractionating columns operate at different pressures. A feed stream is separated with a vapor portion feeding the first column to produce a first column bottoms stream that is split into multiple portions at different pressures and first column overhead stream that is split or separated into two portions at least one of which is subcooled prior to feeding the top of the second column. Optional heat exchange between first column and second column streams provides first column reflux and reboil heat for a second column ascending vapor stream. Three sales gas streams are produced, each at a different pressure. 1. A system for removing nitrogen and for producing a methane product stream from a feed stream comprising nitrogen , methane , and other components , the system comprising:a first separator wherein the feed stream is separated into a first separator overhead stream and a first separator bottoms stream;a first splitter for splitting the first separator overhead stream into a first portion and a second portion;a first fractionating column wherein the first and second portions of the first separator overhead stream are separated into a first column overhead stream and a first column bottoms stream;a second splitter for splitting the first column bottoms stream into three portions;a second fractionating column wherein the first column overhead stream is separated into a second column overhead stream and a second column bottoms stream;a second separator wherein the second column bottoms stream is separated into a second separator overhead stream and a second separator bottoms stream;a first mixer to mix the second separator bottoms stream and a third portion of the first column bottoms stream to form a first mixed ...

Method and System for Separating Nitrogen from Liquefied Natural Gas Using Liquefied Nitrogen

A method for separating nitrogen from an LNG stream with a nitrogen concentration of greater than 1 mol %. A pressurized LNG stream is produced at a liquefaction facility by liquefying natural gas, where the pressurized LNG stream has a nitrogen concentration of greater than 1 mol %. At least one liquid nitrogen (LIN) stream is received from storage tanks, the at least one LIN stream being produced at a different geographic location from the LNG facility. The pressurized LNG stream is separated in a separation vessel into a vapor stream and a liquid stream. The vapor stream has a nitrogen concentration greater than the nitrogen concentration of the pressurized LNG stream. The liquid stream has a nitrogen concentration less than the nitrogen concentration of the pressurized LNG stream. At least one of the one or more LIN streams is directed to the separation vessel. 1. A method for separating nitrogen from an LNG stream with a nitrogen concentration of greater than 1 mol % , comprising:at a liquefaction facility, producing a pressurized LNG stream by liquefying natural gas, where the pressurized LNG stream comprises a nitrogen concentration of greater than 1 mol %;receiving at least one liquid nitrogen (LIN) stream from storage tanks, the at least one LIN stream being produced at a different geographic location from the LNG facility;in a separation vessel, separating the pressurized LNG stream into a vapor stream and a liquid stream, where the vapor stream has a nitrogen concentration greater than the nitrogen concentration of the pressurized LNG stream and the liquid stream has a nitrogen concentration less than the nitrogen concentration of the pressurized LNG stream; anddirecting at least one of the one or more LIN streams to the separation vessel.2. The method of claim 1 , wherein the liquid stream is an LNG stream with a nitrogen concentration of less than 2 mol % or less than 1 mol %.3. The method of claim 1 , further comprising subcooling the LNG stream by ...

Integrated processes and systems for conversion of methane to multiple higher hydrocarbon products

Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products.

Method and apparatus for separating a synthesis gas by cryogenic distillation

In a process for separating a mixture containing carbon monoxide, hydrogen and carbon dioxide, the mixture cooled in a heat exchanger is contacted by a stream of liquid methanol at a temperature below −40° C. to produce carbon dioxide enriched methanol and a carbon dioxide depleted gas relative to the cooled mixture, the carbon dioxide depleted gas is cooled in the heat exchanger and is sent to a separation unit to produce a carbon monoxide enriched stream and a hydrogen enriched stream and the streams enriched in carbon monoxide and hydrogen are heated in the heat exchanger by exchanging heat with the mixture.

ON-BOARD AIRCRAFT OXYGEN ENRICHED AIR AND NITROGEN ENRICHED AIR GENERATION SYSTEM AND METHOD

An on-board aircraft oxygen enriched air and nitrogen enriched air generation system and method are disclosed. In one embodiment, the system includes a first heat exchanger which is configured to receive pressurized air from a source of pressurized air. Further, the first heat exchanger cools the pressurized air to a temperature in the range of −120° C. to −70° C. Furthermore, a separation unit is configured and dimensioned to communicate with the first heat exchanger. The separation unit generates nitrogen enriched air and oxygen enriched air from the cooled air at the temperature range of −120° C. and −70° C. 1. An on-board aircraft system , comprising:a first heat exchanger configured to receive pressurized air from a source of pressurized air, wherein the first heat exchanger cools the pressurized air to a temperature in the range of −120° C. to −70° C.; anda separation unit configured and dimensioned to communicate with the first heat exchanger and to generate nitrogen enriched air and oxygen enriched air from the cooled air at the temperature range of −120° C. and −70° C.2. The system of claim 1 , further comprising:a second heat exchanger coupled to the separation unit to liquefy at least a portion of the generated nitrogen enriched air by cooling the portion of the generated nitrogen enriched air to a temperature in the range of −210° C. to −195° C.; anda nitrogen storage container to store the liquefied portion of the nitrogen enriched air.3. The system of claim 2 , further comprising:a third heat exchanger coupled to the separation unit to liquefy at least a portion of the generated oxygen enriched air by cooling the portion of the generated oxygen enriched air to a temperature in the range of −185° C. to −178° C.; andan oxygen storage container to store the liquefied portion of the oxygen enriched air.4. The system of claim 3 , wherein the first heat exchanger claim 3 , the second heat exchanger and the third heat exchanger comprise one of a liquid helium ...

PROCESS FOR EXPANSION AND STORAGE OF A FLOW OF LIQUEFIED NATURAL GAS FROM A NATURAL GAS LIQUEFACTION PLANT, AND ASSOCIATED PLANT

The process comprises the following steps: mixing a gaseous stream of flash gas and a gaseous stream of boil-off gas to form a mixed gaseous flow; compressing the mixed gaseous flow in at least one compression apparatus to form a flow of compressed combustible gas; withdrawing a bypass flow in the flow of compressed combustible gas; compressing the bypass flow in at least one downstream compressor; cooling and expanding the compressed bypass flow; reheating at least a first stream derived from the expanded bypass flow in at least one downstream heat exchanger, reintroducing the first reheated stream in the mixed gaseous flow upstream from the compression apparatus. 1. A process for expansion and storage of a flow of liquefied natural gas from a natural gas liquefaction plant , comprising:flash expanding the flow of liquefied natural gas in an expander to form a flow of expanded liquefied natural gas;bringing the flow of expanded liquefied natural gas into a flash end capacitor;recovering, at the bottom of the flash end capacitor, a liquid stream of liquefied natural gas;conveying the liquid stream of liquefied natural gas into at least one liquefied natural gas tank;withdrawing, at the head of the flash end capacitor, a gaseous stream of flash gas;recovering, at the head of the liquefied natural gas tank, a gaseous stream of boil-off gas;mixing the gaseous stream of flash gas and the gaseous stream of boil-off gas to form a mixed gaseous flow;compressing the mixed gaseous flow in at least one compressor to form a flow of compressed combustible gas;withdrawing a bypass flow in the flow of compressed combustible gas;compressing the bypass flow in at least one downstream compressor to form a compressed bypass flow;cooling the compressed bypass flow;expanding the compressed bypass flow to form an expanded bypass stream;reheating at least a first stream derived from the expanded bypass flow in at least one downstream heat exchanger,reintroducing the first reheated stream ...

PROCESS AND APPARATUS FOR PRODUCING PRESSURIZED GASEOUS NITROGEN BY CRYOGENIC SEPARATION OF AIR

Process and apparatus for producing pressurized gaseous nitrogen by cryogenic separation of air. The distillation column system includes a high pressure column, a medium pressure column, a main condenser and top condenser both being condenser-evaporators. Compressed and purified feed air is cooled in a heat exchanger and introduced to the distillation system. A gaseous nitrogen stream from the high pressure column is condensed in the main condenser. Bottom liquid of the medium pressure column is evaporated and gaseous nitrogen from the medium pressure column is condensed in the top condenser. Liquid nitrogen from the medium pressure column is pressurized and introduced to the high pressure column. A second gaseous nitrogen stream from the high pressure column is recovered as pressurized gaseous nitrogen product. A portion of the compressed and purified feed air is work-expanded and then warmed in the main heat exchanger. 1. Process for producing pressurized gaseous nitrogen by cryogenic separation of air in a distillation column system comprising a high pressure column , a medium pressure column , a main condenser and a medium pressure column top condenser both in the form of condenser-evaporators , wherebythe total feed air is compressed in a main air compressor to a first pressure which is higher than the operating pressure at the top of the high pressure column,the compressed air stream is purified,the compressed and purified feed air stream is introduced into a main heat exchanger under a first pressure and cooled in the main heat exchanger,at least a portion of the cooled air is introduced into the distillation column system,a first gaseous nitrogen stream from the top the high pressure column is condensed in the liquefaction space of the main condenser,bottom liquid of the high pressure column is sent to an intermediate section of the medium pressure column,bottom liquid of the medium pressure column is sent to the evaporation space of the medium pressure ...

PRODUCTION OF HELIUM FROM A STREAM OF NATURAL GAS

A method for producing a helium gas stream from a gas source containing at least helium, methane, and nitrogen is provided. The method includes introducing the gas into a double column nitrogen rejection unit. 114.-. (canceled)15. A process for producing a helium gas stream from a source gas stream comprising at least helium , methane and nitrogen , the process comprising the following steps:step a): introducing the source gas stream into a double-column nitrogen rejection unit, the double column comprising a high-pressure distillation column, a low-pressure distillation column and a condenser linking the high-pressure column with the low-pressure column, the condenser comprising an outlet, and the high-pressure column comprising a top, and the low-pressure column comprising a top;step b): extracting at the outlet of the condenser at least one part of a mixture produced at the top of the high-pressure column;step c): expanding the mixture resulting from step b) to an intermediate pressure of between 8 bar and 20 bar absolute;step d): separating the intermediate pressure mixture resulting from step c) in a first phase separator vessel into a liquid phase and a helium-enriched gas phase;step e): at least partially condensing the helium-enriched gas phase in a heat exchanger;step f): separating the at least partially condensed stream resulting from step e) in a second phase separator vessel into a liquid phase and a gas phase containing more than 50% by volume of helium.16. The process of claim 15 , further comprising a step g): using claim 15 , as refrigerant claim 15 , the liquid phase after expansion resulting from step f) in the heat exchanger used in step e).17. The process of claim 16 , wherein claim 16 , during step g) claim 16 , the liquid phase is vaporized at a pressure of between 0.1 bar and 3 bar absolute.18. The process of claim 15 , wherein claim 15 , during step a) claim 15 , the gas stream is introduced into the high-pressure column at at least a first ...

METHOD AND SYSTEM FOR RECOVERY OF METHANE FROM HYDROCARBON STREAMS

The invention relates to a method for recovery of methane from hydrocarbon streams comprising the following steps: a. Introducing a feed fluid stream (F), which comprises methane fluid, at least one hydrocarbon free fluid, wherein in particular said at least one hydrocarbon free fluid is nitrogen, and at least one hydrocarbon fluid, into a demethanizer system (); b. Separating said feed fluid stream (F) in the demethanizer system () into a carbon rich fraction (C), comprising hydrocarbons with a carbon content of C2 and higher, and a separation stream (S), comprising methane fluid and at least one hydrocarbon free fluid; c. Introducing said separation stream (S) into a hydrocarbon-free fluid separation system (), in particular in a cryogenic hydrocarbon-free fluid separation system (′), more particularly into a cryogenic nitrogen rejection system (″); wherein said separation stream (S) is compressed by a compressor system () before said separation stream (S) is introduced in said hydrocarbon-free fluid separation system (), wherein said separation stream is compressed to a pressure of 12 bar to 80 bar; d. Separating said separation stream (S) in said free fluid separation system () into a methane stream (M) and a hydrocarbon-free fluid stream (HF) and a respective system for recovery of methane from hydrocarbon streams. 1. A method for recovery of methane from hydrocarbon streams comprising the following steps:{'b': '1', 'a. Introducing a feed fluid stream (F), which comprises methane fluid, at least one hydrocarbon free fluid, wherein in particular said at least one hydrocarbon free fluid is nitrogen, and at least one hydrocarbon fluid, into a demethanizer system ();'}{'b': '1', 'sub': '2', 'b. Separating said feed fluid stream (F) in the demethanizer system () into a carbon rich fraction (C), comprising hydrocarbons with a carbon content of Cand higher, and a separation stream (S,) comprising methane fluid and at least one hydrocarbon free fluid;'}{'b': 2', '2', ' ...

ETHYLENE-TO-LIQUIDS SYSTEMS AND METHODS

Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products. 120.-. (canceled)21. A method of producing a plurality of hydrocarbon products including hydrocarbon compounds with two or more carbon atoms (C compounds) , comprising:{'sub': '2+', '(a) directing methane and an oxidant to an oxidative coupling of methane (OCM) reactor that is upstream of a post-bed cracking (PBC) unit, wherein the OCM reactor is configured to facilitate an OCM reaction using the methane and the oxidant to generate the C compounds including ethylene and one or more alkanes, and wherein the PBC unit is configured to convert the one or more alkanes, including ethane, to one or more alkenes, including ethylene;'}(b) in the OCM reactor, reacting the methane and the oxidant in the OCM reaction to generate an OCM product stream and heat, wherein the OCM product stream comprises ethylene and one or more alkanes;(c) directing the OCM product stream to the PBC unit;(d) in the PBC unit, subjecting the OCM product stream to thermal cracking under conditions that crack ethane to ethylene, wherein the thermal cracking is conducted at least in part with the heat from (b), thereby producing a PBC product stream comprising ethylene;(e) directing the PBC product stream to a separations module, and, in the separations module, separating ethane from the PBC product stream to generate an ethane stream; and(f) directing the ethane stream to the PBC unit.22. The method according to claim 21 , wherein the PBC unit is a section of the OCM reactor.23. The method according to claim 21 , wherein the PBC unit is separate from the OCM reactor.24. The method according to ...

Increasing Efficiency in an LNG Production System by Pre-Cooling a Natural Gas Feed Stream

Described herein are systems and processes to produce liquefied natural gas (LNG) using liquefied nitrogen (LIN) as the refrigerant. Greenhouse gas contaminants are removed from the LIN using a greenhouse gas removal unit. The LNG is compressed prior to being cooled by the LIN.

System and Method for Separating Natural Gas Liquid and Nitrogen from Natural Gas Streams

A system and method for removing nitrogen and producing a high pressure methane product stream and an NGL product stream from natural gas feed streams where at least 90%, and preferably at least 95%, of the ethane in the feed stream is recovered in the NGL product stream. The system and method of the invention are particularly suitable for use with feed streams in excess of 5 MMSCFD and up to 300 MMSCFD and containing around 5% to 80% nitrogen. The system and method preferably combine use of strategic heat exchange between various process streams with a high pressure rectifier tower and the ability to divert all or a portion of a nitrogen rejection unit feed stream to optionally bypass a nitrogen fractionation column to reduce capital costs and operating expenses. 1. A system for removing nitrogen from a feed stream comprising nitrogen , methane , ethane , and other components to produce a methane product stream and an NGL product stream , the system comprising:a first separator wherein the feed stream is separated into a first overhead stream and a first bottoms stream;a first fractionating column wherein the first overhead stream is separated into a second overhead stream and a second bottoms stream;an expander for expanding the first overhead stream prior to the first fractionating column;a second fractionating column wherein the second bottoms stream is separated into a third overhead stream and a third bottoms stream;a third fractionating column wherein at least a first NRU feed stream is separated into a fourth overhead stream and a fourth bottoms stream;a first heat exchanger for cooling a first portion of the feed stream prior to the first separator and cooling a first portion of the second overhead stream prior to the third fractionating column through heat exchange with the fourth bottoms stream and a recycle refrigerant stream;a second heat exchanger for cooling the first portion of the second overhead stream after the first heat exchanger and prior to ...

Treatment Of Nitrogen-Rich Natural Gas Streams

Helium can be recovered from nitrogen-rich natural gas at high pressure with low helium loss by cryogenic distillation of the natural gas after pre-treatment of the gas to remove incompatible impurities and then recovery of natural gas liquid (NGL) from the pre-treated gas by distillation. Overall power consumption may be reduced, particularly if the feed to the helium recovery column system is at least substantially condensed by indirect heat exchange against a first portion of nitrogen-enriched bottoms liquid at first pressure, and a second portion of nitrogen-enriched bottoms liquid at a second pressure that is different from the first pressure. 1. A process for recovering helium and natural gas liquid (NGL) from pressurized natural gas comprising methane , Chydrocarbons , helium and at least about 70% nitrogen , said process comprising:extracting said pressurized natural gas from an underground source;pre-treating said pressurized nitrogen-rich natural gas to remove one or more impurities incompatible with the process and produce pre-treated natural gas;cooling said pre-treated natural gas to produce cooled pre-treated natural gas;{'sub': '2+', 'separating said cooled pre-treated natural gas by distillation in an NGL recovery column system to produce NGL and C hydrocarbon-depleted natural gas comprising helium and methane; and'}{'sub': '2+', 'separating said C hydrocarbon-depleted natural gas by distillation in a helium recovery column system to produce helium-enriched overhead vapor and nitrogen-enriched bottoms liquid comprising methane.'}2. The process of comprising separating said nitrogen-enriched bottoms liquid by distillation in a methane recovery column system to produce nitrogen-enriched overhead vapor and methane-enriched bottoms liquid.3. The process of claim 2 , wherein at least a portion of said nitrogen-enriched bottoms liquid is heated and partially vaporized prior to being fed as feed to said methane recovery column system.4. The process of claim ...

METHOD AND APPARATUS FOR CRYOGENIC SEPARATION OF A MIXTURE CONTAINING AT LEAST CARBON MONOXIDE, HYDROGEN AND NITROGEN

The invention relates to an apparatus for cryogenic separation of a mixture of carbon monoxide, hydrogen and nitrogen, including a stripping column and a denitrogenation column, a pipe for sending the mixture in liquid form to the head of the stripping column, a pipe for removing a liquid depleted of hydrogen connected to the stripping column, a pipe for removing a gas enriched with hydrogen from the stripping column, means for sending the liquid depleted of hydrogen or a fluid derived from said liquid to the denitrogenation column, a pipe for drawing a liquid enriched with carbon monoxide from the denitrogenation column, a pipe for drawing a gas enriched with nitrogen from the head of the denitrogenation column and means for sending at least one portion of the gas enriched with hydrogen to the denitrogenation column. 113-. (canceled)14. A method for the cryogenic separation of a mixture containing at least carbon monoxide , hydrogen and nitrogen , the method comprising the steps of:introducing the mixture, in liquid form, to the top of a stripping column under conditions effective for separation therein to form a hydrogen-lean liquid and a hydrogen-enriched gas;introducing the hydrogen-lean liquid or a fluid derived from the hydrogen-lean liquid to a nitrogen-removal column under conditions effective for separation therein to form a carbon monoxide-enriched liquid and a nitrogen-enriched gas containing the majority of the nitrogen present in the mixture;determining if the nitrogen content of an identified stream selected from the group consisting of the mixture, the nitrogen-enriched gas, a carbon monoxide-enriched gas removed from the top of the separation column in the case of variant ii), and combinations thereof; 'if the nitrogen content of the identified stream is below a threshold,', 'wherein'}i) at least part of the hydrogen-enriched gas coming from the stripping column is sent to an intermediate point of the nitrogen-removal column, orii) if the fluid is ...

METHOD FOR DENITROGENATION OF NATURAL GAS WITH OR WITHOUT HELIUM RECOVERY

The invention relates to a method for denitrogenation of natural gas by distillation, in which natural gas cooled in an exchange line is separated in a system of columns including at least one column, a nitrogen-enriched gas is drawn from one column of the system of columns and is heated in the exchange line, a methane-enriched liquid is drawn from one column of the system of columns, pressurized and vaporized in the exchange line at at least one vaporization pressure, and at least one portion of the cooled natural gas expands in gaseous form in a turbine and is sent to one column of the system of columns in gaseous form. 115-. (canceled)16. A method for the removal of nitrogen from natural gas by distillation , the method comprising the steps of:i) cooling natural gas in an exchange line and then separating said cooled natural gas in a system of columns comprising at least one column;ii) withdrawing a nitrogen-enriched gas from one column of the system of columns and then heating said nitrogen-enriched gas in the exchange line; andiii) withdrawing a methane-enriched liquid from one column of the system of columns, pressurizing the methane-enriched liquid and then vaporizing the pressurized methane-enriched liquid in the exchange line to at least an evaporating pressure,wherein at least part of the cooled natural gas expands in gaseous form in a turbine and is sent to one of the columns of the system of columns in gaseous form,wherein the methane-enriched liquid is vaporized in the exchange line at at least two evaporating pressures.17. The method as claimed in claim 16 , wherein a second part of the natural gas condenses at least partially and is sent in at least partially condensed form to one column of the system of columns.18. The method as claimed in claim 16 , wherein the methane-enriched liquid withdrawn from one column of the system is fully or partially pumped at one or more pressure level(s) before being vaporized in the exchange line.19. The method as ...

Hydrocarbon Gas Processing

A process and an apparatus are disclosed for a compact processing assembly to improve the recovery of C2 (or C3) and heavier hydrocarbon components from a hydrocarbon gas stream. The preferred method of separating a hydrocarbon gas stream generally includes producing at least a substantially condensed first stream and a cooled second stream, expanding both streams to lower pressure, and supplying the streams to a fractionation tower. In the process and apparatus disclosed, the tower overhead vapor is directed to an absorbing means and a heat and mass transfer means inside a processing assembly. A portion of the outlet vapor from the processing assembly is compressed to higher pressure, cooled and substantially condensed in a heat exchange means inside the processing assembly, then expanded to lower pressure and supplied, to the heat and mass transfer means to provide cooling. Condensed liquid from the absorbing means is fed to the tower.

METHOD AND APPARATUS FOR OBTAINING PRESSURIZED NITROGEN BY CRYOGENIC SEPARATION OF AIR

The distillation column system has a high-pressure column, a low-pressure column, a main condenser and a low-pressure-column top condenser. Feed air is cooled in a main heat exchanger and introduced into the high-pressure column. An oxygen-enriched liquid stream is withdrawn from the high-pressure column and introduced into the low-pressure column. A gaseous nitrogen stream is withdrawn from the high-pressure column, warmed in the main heat exchanger and withdrawn as gaseous pressurized nitrogen product. The high-pressure column has a barrier-plate section arranged immediately above the point at which the feed air is introduced. The oxygen-enriched liquid stream is withdrawn from the high-pressure column above the barrier-plate section. A purge stream is withdrawn below the barrier-plate section. The gaseous nitrogen stream, before being warmed in the main heat exchanger, is warmed in a counter-current subcooler in indirect heat exchange with the oxygen-enriched liquid stream from the high-pressure column. 2134. Method according to claim 1 , characterized in that the compressed claim 1 , cleaned and cooled feed air () is introduced () into the high-pressure column () in entirely gaseous form and is superheated in particular by at least 0.1 K or at least 0.2 K.3. Method according to claim 1 , characterized in that{'b': 15', '16', '6', '7, 'an oxygen-rich liquid (, ) is withdrawn from the low-pressure column () and fed to the evaporation space of the low-pressure-column top condenser (),'}{'b': 7', '32', '33', '2', '34', '35, 'the gas generated in the evaporation space of the low-pressure-column top condenser () is warmed as residual gas (, ) to an intermediate temperature in the main heat exchanger () and subsequently () expanded in a work-performing manner in a residual-gas turbine (), and'}{'b': 38', '40', '2, 'the residual gas (, ) expanded in a work-performing manner is reintroduced into the main heat exchanger () and warmed to around ambient temperature.'}43536. ...

ETHYLENE-TO-LIQUIDS SYSTEMS AND METHODS

Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products. 120.-. (canceled)21. A method for generating a catalyst , comprising:(a) providing a catalyst base material having a first set of pores, wherein said catalyst base material comprises an active component that facilitates the conversion of olefins to a first set of hydrocarbons, at least some of which is in liquid form at room temperature and atmospheric pressure;(b) introducing a second set of pores into said catalyst base material, said second set of pores having an average diameter of at least about 10 nanometers (nm) as measured by Brunauer-Emmett-Teller (BET) isotherms; and(c) providing one or more dopants on one or more surfaces of said catalyst base material, wherein said one or more dopants facilitate the conversion of olefins to a second set of hydrocarbons, at least some of which are in liquid form at room temperature and atmospheric pressure, wherein said second set of hydrocarbons has a different product distribution than said first set of hydrocarbons.22. The method of claim 21 , wherein said first set of pores has an average diameter from about 4 Angstroms to 10 Angstroms.23. The method of claim 21 , wherein said catalyst base material comprises a zeolite.24. The method of claim 23 , wherein said zeolite comprises ZSM-5 claim 23 , ZSM-11 claim 23 , ZSM-22 claim 23 , Y claim 23 , beta claim 23 , mordenite claim 23 , L claim 23 , ferrierite claim 23 , MCM-41 claim 23 , SAPO-34 claim 23 , SAPO-11 claim 23 , TS-1 claim 23 , SBA 15 claim 23 , or any combination thereof.25. The method of claim 21 , wherein (a) comprises modifying a functionality of said ...

Integration methods of gas processing plant and nitrogen rejection unit for high nitrogen feed gases

Gas processing plants and methods are contemplated in CO 2 is effectively removed to very low levels from a feed gas to an NRU unit by adding a physical solvent unit that uses waste nitrogen produced by the NRU as stripping gas to produce an ultra-lean solvent, which is then used to treat the feed gas to the NRU unit. Most preferably, the physical solvent unit includes a flash unit and stripper column to produce the ultra-lean solvent.

SYSTEM AND METHOD FOR ARGON RECOVERY FROM A FEED STREAM COMPRISING HYDROGEN, METHANE, NITROGEN AND ARGON

A system and method for argon and nitrogen extraction from a feed stream comprising hydrogen, methane, nitrogen and argon, such as a low-pressure tail gas of an ammonia production plant is provided. The disclosed system and method provides for a rectification system wherein an argon depleted gaseous stream and a methane rich liquid stream are produced and subsequently combined in whole or in part prior to vaporization. Nitrogen and argon containing streams may also be produced from the rectification system. An argon stripping column arrangement is also disclosed where residual argon is removed from the methane-rich fuel gas and recycled back to the feed stream.

SYSTEM AND METHOD FOR ENHANCED ARGON RECOVERY FROM A FEED STREAM COMPRISING HYDROGEN, METHANE, NITROGEN AND ARGON

A system and method for argon and nitrogen extraction from a feed stream comprising hydrogen, methane, nitrogen and argon, such as tail gas of an ammonia production plant is provided. The disclosed system and method provides for nitrogen-argon rectification and the methane rejection within a column system comprised of at least one distillation column. Nitrogen and argon are further separated and to produce liquid products. An argon stripping column arrangement is disclosed where residual argon is further removed from the methane-rich fuel gas and recycled back to the feed stream.

PROCESS FOR SEPARATING HYDROCARBON COMPOUNDS

Disclosed herein are processes for producing and separating ethane and ethylene. In some embodiments, an oxidative coupling of methane (OCM) product gas comprising ethane and ethylene is introduced to a separation unit comprising two separators. Within the separation unit, the OCM product gas is separated to provide a C-rich effluent, a methane-rich effluent, and a nitrogen-rich effluent. Advantageously, in some embodiments the separation is achieved with little or no external refrigeration requirement. 155.-. (canceled)56. A process for producing hydrocarbon compounds via oxidative coupling methane (OCM) , comprising:{'sub': '2+', '(a) directing a feed stream comprising methane and oxygen into an OCM reactor to generate an OCM product gas comprising hydrocarbon compounds with two or more carbon atoms (C compounds);'}(b) separating at least a portion of said OCM product gas into a first stream and a second stream;(c) expanding at least a portion of said first stream substantially isentropically to produce an expanded first stream; and{'sub': 2', '2+, '(d) directing said at least a portion of said first stream expanded in (c) and said second stream into a separations unit to generate a C-rich effluent comprising at least a portion of said C compounds and an effluent comprising methane.'}57. The process of claim 56 , further comprising claim 56 , between (a) and (b) claim 56 , condensing at least a portion of said C compounds in said OCM product gas by reducing a temperature of said OCM product gas using one or more heat exchangers.58. The process of claim 57 , wherein (b) further comprises claim 57 , directing said at least a portion of said OCM product gas into one or more liquid-gas separators to separate said at least a portion of said OCM product gas into said first stream and said second stream.59. The process of claim 58 , wherein said first stream comprises at least a portion of said methane claim 58 , and wherein said second stream comprises at least a ...

Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Intermediate Feed Gas Separation

A method and apparatus for liquefying a natural gas feed stream and removing nitrogen therefrom to produce a nitrogen-depleted LNG product, in which a natural gas feed stream is fed into the warm end of a main heat exchanger, cooled and at least partially liquefied, withdrawn from an intermediate location of the main heat exchanger and separated to form a nitrogen-enriched natural gas vapor stream and a nitrogen-depleted natural gas liquid stream, the liquid and vapor streams being reintroduced into an intermediate location of the main heat exchanger and further cooled in parallel to form a first LNG stream and a first at least partially liquefied nitrogen-enriched natural gas stream, respectively. 1. A method for producing a nitrogen-depleted LNG product , the method comprising:(a) introducing a natural gas feed stream into the warm end of a main heat exchanger, cooling and at least partially liquefying the natural gas feed stream, and withdrawing the cooled and at least partially liquefied stream from an intermediate location of the main heat exchanger;(b) expanding, partially vaporizing and separating the cooled and at least partially liquefied stream to form a nitrogen-enriched natural gas vapor stream and a nitrogen-depleted natural gas liquid stream;(c) withdrawing a portion of the nitrogen-enriched natural gas vapor stream to form a stripping gas stream;(d) separately re-introducing a remaining portion of the nitrogen-enriched natural gas vapor stream and the nitrogen-depleted natural gas liquid stream into an intermediate location of the main heat exchanger to further cooling the remaining portion of the nitrogen-enriched natural gas vapor stream and the nitrogen-depleted natural gas liquid stream in parallel, the remaining portion of the nitrogen-enriched natural gas vapor stream being further cooled and at least partially liquefied to form a first at least partially liquefied nitrogen-enriched natural gas stream and the nitrogen-depleted natural gas liquid ...

Nitrogen Removal with ISO-Pressure Open Refrigeration Natural Gas Liquids Recovery

A process for recovery of natural gas liquids is disclosed, the process including: fractionating a gas stream comprising nitrogen, methane, ethane, and propane and other C hydrocarbons into at least two fractions including a light fraction comprising nitrogen, methane, ethane, and propane, and a heavy fraction comprising propane and other C hydrocarbons; separating the light fraction into at least two fractions including a nitrogen-enriched fraction and a nitrogen-depleted fraction in a first separator; separating the nitrogen-depleted fraction into a propane-enriched fraction and a propane-depleted fraction in a second separator; feeding at least a portion of the propane-enriched fraction to the fractionating as a reflux; recycling at least a portion of the propane-depleted fraction to the first separator. In some embodiments, the nitrogen-enriched fraction may be separated in a nitrogen removal unit to produce a nitrogen-depleted natural gas stream and a nitrogen-enriched natural gas stream. 130-. (canceled)31. A process for recovery of natural gas liquids , comprising:{'sub': 3+', '3+, 'fractionating a gas stream comprising nitrogen, methane, ethane, and propane and other C hydrocarbons in a fractionator into at least two fractions including a light fraction comprising nitrogen, methane, ethane, and propane, and a heavy fraction comprising propane and otherl C hydrocarbons;'}separating the light fraction into at least three fractions including a nitrogen-enriched fraction, an intermediate nitrogen-content fraction, and a nitrogen-depleted fraction in a first separator;compressing and cooling the nitrogen-depleted fraction;separating the compressed and cooled nitrogen-depleted fraction into a propane-enriched fraction and a propane-depleted fraction in a second separator;feeding at least a portion of the propane-enriched fraction to the fractionator as a reflux;recycling at least a portion of the propane-depleted fraction to the first separator;exchanging heat ...

SYSTEM AND METHOD USED TO RECYCLE EXHAUST GAS DURING OLEFIN POLYMER PRODUCTION

A system used to recycle exhaust gas during olefin polymer production, comprising: a compression cooling mechanism (); a hydrocarbon membrane separation mechanism () and a hydrogen membrane separation mechanism (), both connected to a first outlet () of the compression cooling mechanism; and a deep cooling mechanism () connected to a first outlet () of the hydrogen membrane separation mechanism. A method used to recycle exhaust gas during olefin polymer production, comprising a compression cooling step, a hydrocarbon membrane separation step, a hydrogen membrane separation step and a deep cooling step. 1. A system for recycling an exhaust gas in olefin polymer production , comprising:a compression cooling mechanism;a hydrocarbon membrane separation mechanism and a hydrogen membrane separation mechanism, both connected to a first outlet of the compression cooling mechanism; anda deep cooling mechanism connected to a first outlet of the hydrogen membrane separation mechanism.2. The system according to claim 1 , wherein the compression cooling mechanism comprises at least one compression cooling unit claim 1 , wherein the compression cooling unit comprises a compressor claim 1 , a first heat exchanger claim 1 , and a first gas-liquid separator claim 1 , wherein the compressor claim 1 , the first heat exchanger claim 1 , and the first gas-liquid separator are connected in series.3. The system according to claim 1 , wherein the deep cooling mechanism comprises at least one deep cooling unit claim 1 , wherein the deep cooling unit comprises a second heat exchanger claim 1 , a second gas-liquid separator claim 1 , a first throttle valve claim 1 , a third heat exchanger claim 1 , a third gas-liquid separator claim 1 , a second throttle valve claim 1 , a turbo expander claim 1 , and a turbo expander pressurization end.4. The system according to claim 2 , wherein the deep cooling mechanism comprises at least one deep cooling unit claim 2 , wherein the deep cooling unit ...

METHOD AND SYSTEM FOR LIQUEFACTION OF NATURAL GAS USING LIQUID NITROGEN

A method for producing liquefied natural gas (LNG) from a natural gas stream having a nitrogen concentration of greater than 1 mol %. At least one liquid nitrogen (LIN) stream is received at an LNG liquefaction facility. The LIN streams may be produced at a different geographic location from the LNG liquefaction facility. A natural gas stream is liquefied by indirect heat exchange with a nitrogen vent stream to form a pressurized LNG stream. The pressurized LNG stream has a nitrogen concentration of greater than 1 mol %. The pressurized LNG stream is directed to one or more stages of a column to produce an LNG stream and the nitrogen vent stream. The column has upper stages and lower stages. The LIN streams are directed to one or more upper stages of the column. 1. A method for producing liquefied natural gas (LNG) from a natural gas stream having a nitrogen concentration of greater than 1 mol % , comprising:at an LNG liquefaction facility, receiving at least one liquid nitrogen (LIN) stream, the at least one LIN stream being produced at a different geographic location from the LNG liquefaction facility;liquefying a natural gas stream by indirect heat exchange with a nitrogen vent stream to form a pressurized LNG stream, where the pressurized LNG stream has a nitrogen concentration of greater than 1 mol %;directing the pressurized LNG stream to one or more stages of a column to produce an LNG stream and the nitrogen vent stream, wherein the column has upper stages and lower stages; anddirecting one or more LIN streams to one or more upper stages of the column.2. The method of claim 1 , further comprising:prior to directing the pressurized LNG stream to one or more stages of the column, separating the pressurized LNG stream into an LNG vapor stream and an LNG liquid stream, where the LNG vapor stream has a nitrogen concentration greater than the nitrogen concentration of the pressurized LNG stream and the LNG liquid stream has a nitrogen concentration less than the ...

Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Dedicated Reinjection Circuit

A method and apparatus for liquefying a natural gas feed stream and removing nitrogen therefrom to produce a nitrogen-depleted LNG product, in which a natural gas feed stream is passed through main heat exchanger to produce a first LNG stream, which is separated to form a nitrogen-depleted LNG product and a recycle stream composed of nitrogen-enriched natural gas vapor, and in which the recycle stream is passed through main heat exchanger to produce a first LNG stream, separately from and in parallel with the natural gas feed stream, to produce a first at least partially liquefied nitrogen-enriched natural gas stream that is separated to provide a nitrogen-rich vapor product. 1. A method for producing a nitrogen-depleted LNG product , the method comprising:(a) passing a natural gas feed stream through a main heat exchanger to cool the natural gas feed stream and liquefy all or a portion of said stream, thereby producing a first LNG stream;(b) withdrawing the first LNG stream from the main heat exchanger;(c) expanding, partially vaporizing and separating the first LNG stream, or an LNG stream formed from part of the first LNG stream, to form a nitrogen-depleted LNG product and a recycle stream composed of nitrogen-enriched natural gas vapor;(d) compressing the recycle stream to form a compressed recycle stream;(e) passing the compressed recycle stream through the main heat exchanger, separately from and in parallel with the natural gas feed stream, to cool the compressed recycle stream and at least partially liquefy all or a portion thereof, thereby producing a first at least partially liquefied nitrogen-enriched natural gas stream;(f) withdrawing the first at least partially liquefied nitrogen-enriched natural gas stream from the main heat exchanger; and(g) expanding, partially vaporizing and separating the first at least partially liquefied nitrogen-enriched natural gas stream to form a nitrogen-rich vapor product.2. The method of claim 1 , wherein step (c) ...

Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Intermediate Feed Gas Separation

A method and apparatus for liquefying a natural gas feed stream and removing nitrogen therefrom to produce a nitrogen-depleted LNG product, in which a natural gas feed stream is fed into the warm end of a main heat exchanger, cooled and at least partially liquefied, withdrawn from an intermediate location of the main heat exchanger and separated to form a nitrogen-enriched natural gas vapor stream and a nitrogen-depleted natural gas liquid stream, the liquid and vapor streams being reintroduced into an intermediate location of the main heat exchanger and further cooled in parallel to form a first LNG stream and a first at least partially liquefied nitrogen-enriched natural gas stream, respectively. 1. A method for producing a nitrogen-depleted LNG product , the method comprising:(a) introducing a natural gas feed stream into the warm end of a main heat exchanger, cooling and at least partially liquefying the natural gas feed stream, and withdrawing the cooled and at least partially liquefied stream from an intermediate location of the main heat exchanger;(b) expanding, partially vaporizing and separating the cooled and at least partially liquefied stream to form a nitrogen-enriched natural gas vapor stream and a nitrogen-depleted natural gas liquid stream;(c) separately re-introducing said vapor and liquid streams into an intermediate location of the main heat exchanger, further cooling the vapor and liquid streams in parallel, the liquid stream being further cooled to form a first LNG stream and the vapor stream being further cooled and at least partially liquefied to form a first at least partially liquefied nitrogen-enriched natural gas stream, and withdrawing the first LNG stream and the first at least partially liquefied nitrogen-enriched natural gas stream from the cold end of the main heat exchanger;(d) expanding, partially vaporizing and separating the first at least partially liquefied nitrogen-enriched natural gas stream to form a nitrogen-rich vapor ...

Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Refrigerated Heat Pump

A method for liquefying a natural gas feed stream and removing nitrogen therefrom, the method comprising passing a natural gas feed stream through a main heat exchanger to produce a first LNG stream, and separating a liquefied or partially liquefied natural gas stream in a distillation column to form nitrogen-rich vapor product, wherein a closed loop refrigeration system provides refrigeration to the main heat exchanger and to a condenser heat exchanger that provides reflux to the distillation column. 1. A method for liquefying a natural gas feed stream and removing nitrogen therefrom , the method comprising:(a) passing a natural gas feed stream through a main heat exchanger to cool the natural gas stream and liquefy all or a portion of said stream, thereby producing a first LNG stream;(b) withdrawing the first LNG stream from the main heat exchanger;(c) expanding and partially vaporizing a liquefied or partially liquefied natural gas stream, and introducing said stream into a distillation column in which the stream is separated into vapor and liquid phases, wherein the liquefied or partially liquefied natural gas stream is the first LNG stream, or is an at least partially liquefied nitrogen-enriched natural gas stream formed from separating a nitrogen-enriched natural gas stream from the first LNG stream or from the natural gas feed stream and at least partially liquefying said stream in the main heat exchanger;(d) forming a nitrogen-rich vapor product from overhead vapor withdrawn from the distillation column;(e) providing reflux to the distillation column by condensing a portion of the overhead vapor from the distillation column in a condenser heat exchanger; and(f) forming a second LNG stream from bottoms liquid withdrawn from the distillation column;wherein refrigeration for the main heat exchanger and for the condenser heat exchanger is provided by a closed loop refrigeration system, refrigerant circulated by the closed loop refrigeration system passing ...

METHOD AND APPARATUS FOR PRODUCING PRODUCT NITROGEN GAS AND PRODUCT ARGON

An apparatus for producing product nitrogen gas and product argon, comprising: a first rectification column into which raw air is introduced; a second rectification column from which product nitrogen gas is drawn; a third rectification column from which product argon gas is drawn; and a first condenser configured to perform heat exchange between a gas accumulated in a column top portion of the first rectification column, and a liquid accumulated in a column bottom portion of the second rectification column, wherein an intermediate portion gas containing nitrogen is drawn from an intermediate portion of the second rectification column and merged with a condenser gas drawn from the first condenser. The merged gases are expanded and cooled by means of an expansion turbine whereby the cold thereof is utilized. 1. A method for producing product nitrogen gas and product argon , comprising:a cooling step in which raw air from which predetermined impurities have been removed is cooled;a raw air introduction step in which the raw air cooled in the cooling step is introduced into a first rectification column;a first oxygen-enriched liquid introduction step in which an oxygen-enriched liquid drawn from a column bottom portion of the first rectification column is introduced into a second rectification column;a second oxygen-enriched liquid introduction step in which at least a portion of the oxygen-enriched liquid drawn from the column bottom portion of the first rectification column is introduced into a second condenser disposed in a third rectification column;a nitrogen-containing liquid introduction step in which a nitrogen-containing liquid condensed in the first rectification column is introduced as a reflux liquid at an upper portion of the second rectification column;an expansion step in which at least a portion of a mixed gas is expanded to generate cold, the mixed gas comprising an intermediate portion gas drawn from an intermediate portion of the second rectification ...

INTEGRATION METHODS OF GAS PROCESSING PLANT AND NITROGEN REJECTION UNIT FOR HIGH NITROGEN FEED GASES

Gas processing plants and methods are contemplated in COis effectively removed to very low levels from a feed gas to an NRU unit by adding a physical solvent unit that uses waste nitrogen produced by the NRU as stripping gas to produce an ultra-lean solvent, which is then used to treat the feed gas to the NRU unit. Most preferably, the physical solvent unit includes a flash unit and stripper column to produce the ultra-lean solvent. 1. A method of regenerating an ultra-lean solvent for deep COremoval of a treated feed gas , comprising:{'sub': 2', '2', '2, 'using an ultra-lean physical solvent in an absorber to remove COfrom the treated feed gas to thereby form a CO-loaded physical solvent and a CO-depleted feed gas;'}{'sub': 2', '2', '2, 'removing in a nitrogen rejection unit Nfrom the CO-depleted feed gas to thereby produce a Nwaste stream and a pipeline gas; and'}{'sub': 2', '2', '2', '2, 'regenerating the ultra-lean physical solvent from the CO-loaded physical solvent in a process that includes flashing the CO-loaded physical solvent and stripping the flashed CO-loaded physical solvent using the Nwaste stream as a stripping gas.'}2. The method of claim 1 , wherein the ultra-lean physical solvent is a non-aqueous physical solvent.3. The method of claim 2 , wherein no dehydration of the CO-depleted feed gas is required.4. The method of claim 1 , wherein the treated feed gas has a pressure of about 1 claim 1 ,000 psig to 1 claim 1 ,500 psig.5. The method of claim 4 , wherein the flashed CO-loaded physical solvent has a pressure of equal to or less than 100 psig.6. The method of claim 1 , wherein the step of flashing comprises reducing a pressure of the CO-loaded physical solvent in an amount of at least 1 claim 1 ,000 psig.7. The method of claim 1 , wherein the CO-depleted feed gas has equal or less than 3 claim 1 ,000 ppmv CO.8. The method of claim 7 , wherein the CO-depleted feed gas has equal or less than 1 claim 7 ,000 ppmv CO.9. The method of claim 1 , wherein ...

METHOD AND PLANT FOR GENERATION OF SYNTHESIS GAS

Method and plant for generating a synthesis gas which consists mainly of carbon monoxide and hydrogen and has been freed of acid gases, proceeding from a hydrocarbonaceous fuel, and air and steam, wherein low-temperature fractionation separates air into an oxygen stream, a tail gas stream and a nitrogen stream, wherein the tail gas stream and the nitrogen stream are at ambient temperature and the nitrogen stream is at elevated pressure, wherein the hydrocarbonaceous fuel, having been mixed with the oxygen stream and steam at elevated temperature and elevated pressure, is converted to a synthesis gas by a method known to those skilled in the art, and wherein acid gas is subsequently separated therefrom by low-temperature absorption in an absorption column, wherein the nitrogen stream generated in the fractionation of air is passed through and simultaneously cooled in an expansion turbine and then used to cool either the absorbent or the coolant circulating in the coolant circuit of the compression refrigeration plant. 110-. (canceled)11. A method of generating a synthesis gas which consists essentially of carbon monoxide and hydrogen and has been purified of acid gases , proceeding from a hydrocarbonaceous fuel , and air and steam , wherein low-temperature fractionation separates air into an oxygen stream , a tail gas stream and a nitrogen stream , wherein the tail gas stream and the nitrogen stream are at ambient temperature and the nitrogen stream is at elevated pressure , wherein the hydrocarbonaceous fuel , having been mixed with the oxygen stream and steam at elevated temperature and elevated pressure , is converted to a synthesis gas by a method known to those skilled in the art , and wherein acid gas is subsequently separated therefrom by low-temperature absorption in an absorption column , wherein the absorbent is cooled by means of a compression refrigeration plant , wherein the nitrogen stream generated by low-temperature fractionation of air is passed ...

REFLUX OF DEMETHENIZATION COLUMNS

A process for the separation of the components of a gas mixture to be treated comprising methane, nitrogen and at least one hydrocarbon having at least two carbon atoms, or a mixture of these hydrocarbons, including introducing the gas mixture to be treated into a first distillation column, thereby producing, in the column bottom, a first liquid stream enriched in hydrocarbon having at least two carbon atoms and, at the column top, a first gas stream enriched in methane; and introducing the first liquid stream enriched in hydrocarbon having at least two carbon atoms resulting from stage a) into a second distillation column, thereby producing, at the top of this column, a second gas stream rich in methane and, in the bottom of this column, a second liquid stream comprising at least 85 mol % of the hydrocarbons having at least two carbon atoms initially present in the mixture to be treated. 113.-. (canceled)15. The process as claimed in claim 14 , wherein a portion of the second gas stream is reduced in pressure in a turbine to a pressure at least lower by 1 bar than the pressure of said second distillation column.16. The process as claimed claim 14 , wherein the nitrogen content of said second gas stream is at least 1.5 times lower than the nitrogen content of the first gas stream.17. The process as claimed in claim 14 , further comprising stage c): introduction of said first gas stream enriched in methane resulting from stage a) into a denitrogenation unit in order to separate the nitrogen.18. The process as claimed in claim 17 , wherein the second gas stream resulting from stage b) is not treated by the denitrogenation unit.19. The process as claimed in claim 18 , wherein from 5 mol % to 30 mol % of the methane initially present in the gas mixture to be treated is comprised in the first liquid stream enriched in hydrocarbon having at least two carbon atoms resulting from stage a).20. The process as claimed in claim 14 , wherein from 10 mol % to 20 mol % of the ...

Optimization of a process for denitrogenation of a natural gas stream

A process for the separation of the components of a gas mixture to be treated comprising methane, nitrogen and at least one hydrocarbon having at least two carbon atoms, or a mixture of these hydrocarbons, including introducing the gas mixture to be treated into a first distillation column thereby producing, at the column top, a first gas stream enriched in methane and, at a level lower than that of the top of the column, another gas stream; and introducing the other gas stream resulting from step a) into a second distillation column, at a level lower than that of that of the top of the second column, thereby producing, at the top of this column, a second gas stream rich in methane.

METHODS FOR RECOVERING ALKENES AND NITROGEN FROM PROCESS GAS STREAMS

Methods and systems for recovering alkenes (e.g. ethylene, propylene) and nitrogen from process gas streams, including multi-step condensing of the process gas stream, are provided herein. 1. A method for recovering C-Calkene and nitrogen from a process gas stream comprising:{'sub': 2', '4, 'cooling the process gas stream comprising C-Calkene in a cooling apparatus with a first gaseous cooling medium or by mechanical means under suitable conditions to produce a first cooled process gas stream;'}cooling the first cooled process gas stream in a first condenser vessel with a second cooling medium under suitable conditions to produce a first condensate comprising impurities, a second cooled process gas stream and a first gaseous nitrogen stream;{'sub': 2', '4, 'cooling the second cooled process gas stream in a second condenser vessel with a third cooling medium under suitable conditions to produce a second condensate comprising C-Calkene, a vent gas stream and a second gaseous nitrogen stream; and'} (i) at least a portion of the first gaseous nitrogen stream and/or the second gaseous nitrogen stream to the cooling apparatus for use as at least a portion of the first gaseous cooling medium; or', '(ii) at least a portion of the second gaseous nitrogen stream to the first condenser vessel for use as at least a portion of the second cooling medium., 'recycling at least one of the following2. The method of further comprising maintaining the pressure of the first gaseous cooling medium within the first cooling apparatus at a pressure of at least about 500 kPa.3. The method of claim 1 , wherein the process gas stream enters the cooling apparatus at a temperature of at least about 15° C. and a pressure of at least about 90 kPa.4. The method of claim 1 , wherein the first cooled process gas stream exits the cooling apparatus at a temperature of at least about −40° C.5. The method of claim 1 , wherein the impurities are water claim 1 , hydrogen claim 1 , C-Chydrocarbons claim 1 , ...

System and Method for Reducing Nitrogen Content of GSP/Expander Product Streams for Pipeline Transport

A system and method for removing nitrogen from an intermediate stream in a gas subcooled process operation that processes natural gas into a sales gas stream and a natural gas liquids stream. The system and method of the invention are particularly suitable for use with gas subcooled process operations where the sales gas stream exceeds pipeline nitrogen specifications by up to about 3%, such as for reducing the nitrogen content of sales gas streams to levels permissible for pipeline transport. 1. A system for removing nitrogen from a feed stream comprising nitrogen , methane , ethane , and other components to produce a methane product stream , the system comprising:a first separator wherein the feed stream is separated into a first overhead stream and a first bottoms stream;a second separator wherein the first overhead stream is separated into a second overhead stream and a second bottoms stream;a first splitter for splitting the second bottoms stream into a first portion and a second portion;a first fractionating column wherein a first portion of the second overhead stream is separated into a third overhead stream and a third bottoms stream;a second fractionating column wherein the first bottoms stream, the first portion of the second bottoms stream, the second portion of the second bottoms stream; a second portion of the second overhead stream, and the third bottoms stream are separated into a fourth overhead stream and a fourth bottoms stream;a first heat exchanger for cooling at least a portion of the feed stream prior to the first separator through heat exchange with the fourth overhead stream;a second heat exchanger for cooling the first overhead stream through heat exchange with the fourth overhead stream;a subcooler for cooling the first portion of the second overhead stream prior to entering the first fractionating column and for cooling a first portion of the second bottoms stream prior to entering the second fractionating column through heat exchange with ...

Device and method for purifying a gas mixture

Device and method for purifying a gas mixture to produce a concentrated gas, notably neon, starting from a mixture comprising neon, said device including, in a cold box housing a cryogenic purification circuit comprising, in series, at least one unit for purifying the mixture by cryogenic adsorption at a temperature between 65K and 100K and notably 65K, then a unit for cooling the mixture to a temperature between 25 and 65 K and then a unit for cryogenic distillation of the mixture to produce the concentrated liquid at the outlet of the cryogenic distillation unit, characterized in that the unit for cooling the mixture to a temperature between 25 and 65 K comprises at least one cryocooler that extracts thermal power from the mixture via a heat exchanger.

INTEGRATED PROCESSES AND SYSTEMS FOR CONVERSION OF METHANE TO MULTIPLE HIGHER HYDROCARBON PRODUCTS

Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products. 119.-. (canceled)20. A method of generating a plurality of hydrocarbon products , comprising:{'sub': 2', '4, '(a) providing an oxidative coupling of methane (OCM) product stream comprising ethylene (CH);'}(b) splitting said OCM product stream into two or more portions of said OCM product stream; and{'sub': 2', '4, '(c) directing said two or more portions of said OCM product stream into a plurality of ethylene conversion reactors comprising a first ethylene conversion reactor and a second ethylene conversion reactor, wherein said first ethylene conversion reactor and said second ethylene conversion reactor permit at least a portion of said CHfrom said two or more portions of said OCM product stream to react in ethylene conversion processes to generate product streams comprising higher hydrocarbon products or higher hydrocarbon product distributions that are different between said first ethylene conversion reactor and said second ethylene conversion reactor, thereby generating said plurality of hydrocarbon products.'}21. The method of claim 20 , wherein (a) further comprises claim 20 , directing methane and an oxidant into an OCM reactor that permits at least a portion of said methane and said oxidant to react in an OCM reaction to generate said OCM product stream.22. The method of claim 20 , wherein at least a subset of said plurality of ethylene conversion reactors are separate from and operate in a parallel configuration with respect to one another.23. The method of claim 21 , wherein said plurality of ethylene conversion reactors is fluidly coupled to said ...

Single Column Nitrogen Rejection Unit with Side Draw Heat Pump Reflux System and Method

A system for removing nitrogen from a natural gas fluid feed stream includes a main heat exchanger that receives the natural gas fluid feed stream. A distillation column receives a cooled fluid stream from the main heat exchanger and features a return vapor outlet and a side vapor outlet port, The return vapor outlet provides nitrogen vapor to the main heat exchanger which is warmed therein. The side vapor outlet port provides vapor to the main heat exchanger and a reflux compressor receives and compresses the resulting fluid from the main heat exchanger. A reflux aftercooler receives and cools fluid from the reflux compressor, directs cooled fluid to the main heat exchanger and the resulting fluid is directed to a reflux separation device. The reflux separation device has a vapor outlet and a liquid outlet. The vapor outlet of the reflux separation device directs fluid to the main heat exchanger so that fluid is directed to the first reflux inlet port of the distillation column. The liquid outlet of the reflux separation device directs fluid to a second reflux inlet port of the distillation column. 1. A system for removing nitrogen from a natural gas fluid feed stream comprising:a. a main heat exchanger including a main feed cooling passage, a withdrawn vapor warming passage, a main reflux stream cooling passage, a reflux vapor cooling passage and a nitrogen vapor return passage, said main feed cooling passage including an inlet and an outlet, where the inlet of the main feed cooling passage is configured to receive the natural gas fluid feed stream;b. a distillation column including a feed inlet, a return vapor outlet, a side vapor outlet port, first and second reflux inlet ports and a bottoms liquid outlet, wherein said side vapor outlet port and said first and second reflux inlet ports are positioned between the feed inlet and the return vapor outlet;c. said feed inlet of the distillation column configured to receive a fluid stream from the outlet of the main ...

SYSTEM AND METHOD FOR ENHANCED ARGON RECOVERY FROM A FEED STREAM COMPRISING HYDROGEN, METHANE, NITROGEN AND ARGON

A system and method for argon and nitrogen extraction from a feed stream comprising hydrogen, methane, nitrogen and argon, such as tail gas of an ammonia production plant is provided. The disclosed system and method provides for nitrogen-argon rectification and the methane rejection within a column system comprised of at least one distillation column. Nitrogen and argon are further separated and to produce liquid products. An argon stripping column arrangement is disclosed where residual argon is further removed from the methane-rich fuel gas and recycled back to the feed stream. 1. (canceled)2. (canceled)3. (canceled)4. (canceled)5. (canceled)6. (canceled)7. (canceled)8. (canceled)9. (canceled)10. (canceled)11. (canceled)12. (canceled)13. (canceled)14. (canceled)15. (canceled)16. (canceled)17. (canceled)18. (canceled)19. (canceled)20. (canceled)21. (canceled)22. (canceled)23. (canceled)24. (canceled)25. (canceled)26. (canceled)27. A system for recovery of argon from a feed stream comprising hydrogen , nitrogen , methane and argon , the system comprising:a conditioning circuit configured for conditioning the feed stream to a temperature suitable for rectification and at pressure less than or equal to about 400 psia;at least one rectifying column configured to receive the conditioned feed stream and produce an argon depleted, nitrogen rich vapor stream, an argon enriched side draw, and a methane-rich liquid stream;an argon stripping column configured to receive the methane rich liquid stream and strip argon from the methane rich liquid stream using the argon depleted, nitrogen rich vapor stream and produce an argon depleted methane rich liquid from the bottom of the argon stripping column and an argon containing overhead gas from the top of the argon stripping column;a recycle circuit configured for extracting the argon containing overhead gas from the argon stripping column and mixing the argon containing overhead gas with the feed stream; anda distillation column ...

PROCESS AND SYSTEM FOR REMOVING NITROGEN FROM LNG

Processes and systems are provided for removing nitrogen from a hydrocarbon-containing gas to thereby recover a liquid natural gas (LNG) stream. In particular, the processes and systems described herein can be used to efficiently separate methane from nitrogen, which is an undesirable byproduct found in many hydrocarbon-containing gases used to produce LNG. The processes and systems described herein can utilize various refrigerant systems to separate and produce the LNG. 1. A process for recovering methane from a hydrocarbon-containing gas , the process comprising:(a) cooling and at least partially condensing a feed stream comprising the hydrocarbon-containing gas to thereby provide a cooled feed stream, wherein the hydrocarbon-containing gas comprises in the range of 0.5 to 30 mole percent of nitrogen;(b) fractionating at least a portion of the cooled feed stream in a distillation column to thereby form a nitrogen-poor bottom stream and a nitrogen-rich overhead stream, wherein the fractionating occurs at a pressure in the range of 1 to 8 MPa, wherein the nitrogen-rich overhead stream comprises at least 75 percent of the nitrogen originally present in the hydrocarbon-containing gas; and(c) recovering at least a portion of the nitrogen-poor bottom stream to thereby form an LNG-enriched stream.2. The process of claim 1 , wherein at least a portion of the cooling in step (a) is carried out via indirect heat exchange with a single mixed refrigerant stream in a closed-loop refrigeration cycle claim 1 , a dual mixed refrigerant cycle claim 1 , a cascade refrigeration cycle claim 1 , or a nitrogen refrigeration cycle.3. The process of claim 1 , wherein at least a portion of the cooling in step (a) is carried out via indirect heat exchange with a mixed refrigerant stream in a closed-loop refrigeration cycle.4. The process of claim 1 , further comprising claim 1 , prior to the cooling of step (a) claim 1 , cooling the hydrocarbon-containing gas to thereby form a cooled ...

SYSTEMS AND METHODS FOR REMOVAL OF NITROGEN FROM LNG

A system for the removal of nitrogen from a liquid natural gas (LNG) stream. The system. comprises a feed heat changer and a stripper column. The heat receives the LNG stream and cools the LNG stream via heat exchange with a stripper column side-draw stream to yield a cooled LNG stream and a heated side-draw stream. The stripper column receives the cooled LNG stream at a first tray and the heated side-draw stream. The stripper column produces the stripper column side-draw stream, a stripper column overhead stream, and a stripper column bottom stream. The stripper column side-draw stream is taken from the stripper column at a second tray. The second tray is at least about 15 feet higher than the feed heat exchanger. 1. A system for the removal of nitrogen from a liquid natural gas (LNG) stream , the system comprising:a feed heat exchanger, wherein the heat is configured to receive the LNG stream and to cool the LNG stream via heat exchange with a stripper column side-draw stream to yield a cooled LNG stream and a heated side-draw stream; anda stripper column, wherein the stripper column is configured to receive the cooled LNG stream at a first tray and the heated side-draw stream, and wherein the stripper column is configured to produce the stripper column side-draw stream, a stripper column overhead stream, and a stripper column bottom stream,wherein the stripper column is configured such that the stripper column side-draw stream is taken from the stripper column at a second tray, wherein the second tray is at least about 15 feet higher than the feed heat exchanger.2. The system of claim 1 , further comprising a pressure reduction device claim 1 , wherein the pressure reduction device is configured to reduce the pressure of the stripper column side-draw stream prior to introduction into the feed heat exchanger.3. The system of claim 2 , wherein the pressure reduction device is a valve.4. The system of claim 2 , further comprising a control device claim 2 , wherein ...

PROCESS FOR REMOVING NITROGEN FROM NATURAL GAS

A process for separating the components of a gas mixture comprising methane, nitrogen, and at least one hydrocarbon having at least two carbon atoms, or a mixture of these hydrocarbons, including the following steps: a) demonization of the gas mixture with at least one demethenization column; b) extraction of a liquid comprising at least 85 mol % of the hydrocarbons having at least two carbon atoms, partial condensation of a gas mixture in order to obtain a liquid, at least a portion of which is treated in order to be extracted as denitrogenated natural gas product and a second gas; d) introduction of the second gas and/or the gas mixture into a nitrogen removal column, obtained from which are a gas and a liquid, e) treatment of the gas in a nitrogen removal system in order to produce a gas stream comprising 5 mol % at most of nitrogen. 19.-. (canceled)10. A process for separating the components of a gas mixture to be treated comprising methane , nitrogen and at least one hydrocarbon having at least two carbon atoms , or a mixture of these hydrocarbons , comprising the following steps:a) removing methane from said gas mixture using at least one methane removal column;b) extracting from the methane removal column a liquid comprising at least 85 mol % of hydrocarbons having at least two carbon atoms initially present in the mixture to be treated;c) partially condensing a gas mixture extracted from the methane removal column in order to obtain a liquid, at least one portion of which is treated in order to be extracted as denitrogenated natural gas product, and a second gas;d) introducing said second gas and/or the gas mixture into a nitrogen removal column obtained from which are a gas and a liquid, at least one portion of which is treated in order to be extracted as denitrogenated natural gas product;e) treating said gas from step d) in a nitrogen removal system in order to produce a gas stream comprising 5 mol % at most of nitrogen and a gaseous nitrogen stream ...

LNG PROCESS FOR VARIABLE PIPELINE GAS COMPOSITION

The invention relates to a system, method and apparatus for processing natural gas in an LNG facility. A natural gas feed is introduced into a heavies removal unit. The heavies removal system includes a heavies removal column and a distillation column. The heavies removal column and the distillation column are connected via a purge/recovery line. One or more components of the natural gas feed is purged from the heavies removal column to the distillation column via the purge/recovery line to obtain a specified concentration or concentration range of heavy components feeding into the distillation column. 1. A method for processing natural gas in an LNG facility comprising:introducing a natural gas feed to a heavies removal unit, wherein the heavies removal system includes a heavies removal column and a distillation column, wherein the heavies removal column and the distillation column are fluidly connected; andpurging one or more components of the natural gas feed from the heavies removal column to a methane recycle stream via the purge/recovery line to obtain a specified concentration or concentration range of heavy components feeding into the distillation column.2. The method of claim 1 , wherein the distillation column is a high pressure demethanizer.3. The method of claim 1 , further comprising:adjusting rate of the purging based in order to adjust flow rate to the distillation column.4. The method of claim 1 , wherein the LNG facility is configured for a cascade liquefaction process.5. The method of claim 1 , wherein the heavies removal column is downstream of the distillation column.6. The method of claim 1 , wherein the purging removes hydrocarbons having 6 or more carbons.7. A method for processing natural gas feed during natural gas liquefaction comprising:introducing the natural gas feed into a heavies removal unit, wherein the heavies removal system includes a heavies removal column and a demethanizer, wherein the heavies removal column and the demethanizer ...

Recovery of hydrocarbons from polyalkene product purge gas

Hydrocarbons are recovered from the product purge gas in an alkene polymerization process by absorption of heavier hydrocarbons from the purge gas by an intermediate hydrocarbon stream to yield a vapor rich in inert gas and alkene monomer. Alkene monomer is condensed at low temperatures from the inert gas, flashed and vaporized to provide refrigeration for the condensation step, and recycled to the polymerization process. The intermediate hydrocarbon from the absorption step is recycled to the polymerization process. Optionally a portion of the inert gas is reused for purge gas.

Recovery of hydrocarbons from polyalkene product purge gas

Hydrocarbons are recovered from the product purge gas in an alkene polymerization process by absorption of heavier hydrocarbons from the purge gas by an intermediate hydrocarbon stream to yield a vapor rich in inert gas and alkene monomer. Alkene monomer is condensed and rectified by dephlegmation at low temperatures from the inert gas, flashed and vaporized to provide refrigeration for the condensation step, and recycled to the polymerization process. The intermediate hydrocarbon from the absorption step is recycled to the polymerization process. Optionally a portion of the inert gas is reused for purge gas.

含空气煤层气液化工艺及设备

本发明公开了一种含空气煤层气的液化工艺，包括压缩净化工艺、制冷工艺和液化分离工艺，该液化分离工艺中采用低温双级精馏方法，其液化和分离都在低温下进行，分离纯度高，安全性能好，其液化天然气的产品纯度可以达到99％以上，排放到空气中甲烷含量仅为1％左右，有效回收了资源；本发明还提供了这种含空气煤层气的液化设备。

含空气煤层气液化分离工艺及设备

本发明公开了一种含空气煤层气的液化分离工艺，主要是将冷却后的含空气煤层气通入一分馏塔的中部，经分馏塔底部的蒸发器的蒸发和顶部冷凝器的冷凝、塔内的气体馏分、液体馏分进行充分的质、热交换，在分馏塔顶部得到高纯度的氮气，分馏塔底部得到高纯度的液态天然气，其中，在分馏塔顶部与含空气煤层气入口之间引出一部分洁净空气通入换热器中。本发明还提供了上述液化分离工艺设备。本发明含空气煤层气液化分离设备及工艺是专为含空气煤层气设计的分离液化过程，采用单级精馏设备，较双级精馏的工艺更简单，操作更方便，其投入成本较低，利于大规模推广。

Process for separating hydrocarbon compounds

Abstract Disclosed herein are processes for producing and separating ethane and ethylene. In some embodiments, an oxidative coupling of methane (OCM) product gas comprising ethane and ethylene is introduced to a separation unit comprising two separators. Within the separation unit, the OCM product gas is separated to provide a C2-rich effluent, a methane-rich effluent, and a nitrogen-rich effluent. Advantageously, in some embodiments the separation is achieved with little or no external refrigeration requirement. 11 104 Vr 11) FRETOCK 0010 00C0ii SED.R41101 0 1 I woo REMANENT T- 112 114 111 2011 21,9 124 H2c 110 HG. 2 Date Recue/Date Received 2020-09-03

Integrated processes and systems for conversion of methane to multiple higher hydrocarbon products

Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products.

乙烯成液体的系统和方法

本申请涉及一种乙烯成液体的系统和方法。本发明提供了由甲烷生产高级烃组合物例如液体烃组合物的集成系统，其使用甲烷氧化偶合系统将甲烷转化为乙烯，然后将乙烯转化为可选择的高级烃产物。本发明提供了将甲烷处理成这些高级烃产物的集成系统和方法。