СПОСОБ ПОЛУЧЕНИЯ ФТОРИРОВАННОГО ПОЛИМЕРА

Изобретение относится к способу получения фторированного полимера, имеющего циклическую структуру. Предложен способ получения фторированного полимера полимеризацией мономерного компонента, содержащего перфтормономер, имеющий специфическую циклическую структуру, в присутствии инициатора полимеризации при заранее заданной температуре полимеризации с получением смеси, содержащей фторированный полимер и непрореагировавший мономер с циклической структурой. Перфтормономер, имеющий циклическую структуру, извлекают из смеси при температуре, не превышающей максимальную конечную температуру полимеризации +12°C и не превышающей температуру 10-часового периода полураспада инициатора полимеризации +12°C при давлении ниже атмосферного давления. Технический результат – снижение стоимости производства полимера за счет эффективного извлечения и последующего использования дорогостоящего мономера. 7 з.п. ф-лы, 4 табл., 6 пр.

РАСШИРЕНИЕ ЭТИЛЕНА ДЛЯ НИЗКОТЕМПЕРАТУРНОГО ОХЛАЖДЕНИЯ ПРИ РЕКУПЕРАЦИИ ОТХОДЯЩЕГО ГАЗА ПОЛУЧЕНИЯ ПОЛИЭТИЛЕНА

Изобретение относится к способу и системе для выделения углеводородов, содержащихся в отходящем потоке процесса полимеризации. Способ включает снижение давления потока этилена от давления не менее 3,4 МПа до давления не более 1,4 МПа, охлаждение отходящего газа, включающего мономер, путем теплообмена с потоком этилена пониженного давления с получением первого конденсата, включающего часть мономера, захваченного первым легким газом, выделение первого конденсата и первого легкого газа, отделение первого конденсата от первого легкого газа, компримирование потока этилена пониженного давления до давления не менее 2,4 МПа и пропускание компримированного потока этилена в реактор полимеризации. Изобретение обеспечивает эффективное выделение углеводородов из отходящего газа, повторное применение значительной части олефинового мономера и повторное применение содержащихся в отходящем газе инертных компонентов. 2 н. и 10 з.п. ф-лы, 5 ил.

СПОСОБ ОКОНЧАТЕЛЬНОЙ ОБРАБОТКИ ПОЛИОЛЕФИНА

Изобретение относится к способу выполнения окончательной обработки гранул полиолефина, полученного полимеризацией одного или более α-олефина. Способ включает (1) контактирование полиолефина, выгруженного из реактора полимеризации, с противотоком насыщенного пара для того, чтобы отпарить газы из указанного полиолефина и образовать конденсированный пар на частицах указанного полиолефина; (2) сушку частиц полиолефина противотоком сухого инертного газа, поддерживая частицы полиолефина в условиях псевдоожижения за счет указанного потока сухого инертного газа. Охлаждение полиолефина происходит за счет испарения указанного конденсированного пара. Время пребывания указанного полиолефина на стадии (1) составляет 10-45 минут. Технический результат - эффективная дезактивация компонентов катализатора и удаление непрореагировавших мономеров и тяжелых углеводородов из порошка полиолефина, выгруженного из реактора полимеризации. 12 з.п. ф-лы, 5 ил., 1 табл., 3 пр.

СПОСОБ ПОЛУЧЕНИЯ ВОДО- И МАСЛООТТАЛКИВАЮЩЕГО АГЕНТА

Описан способ получения водо- и маслоотталкивающего агента, предусматривающий эмульгирование (а) 15-85 мас.% перфторалкилэтилакрилата, (b1) 5-65 мас.% 2-этилгексилметакрилата и (b2) 1-40 мас.% бензилметакрилата в присутствии (с) катионного поверхностно-активного вещества типа аддукта полиэтиленоксида или как указанного катионного поверхностно-активного вещества, так и неионогенного поверхностно-активного вещества типа аддукта полиэтиленоксида, или нейтрализованного органической кислотой соединения амина, имеющего полиэтиленоксидные цепи, и (d) соединения на основе полипропиленгликоля, имеющего молекулярную массу 300-3000, или гексиленгликоля, с последующей реакцией сополимеризации в присутствии инициатора полимеризации, и смешение получаемой водной дисперсии с (е) блокированным изоцианатом. Также описан водо- и маслоотталкивающий агент, полученный таким способом, который обладает удовлетворительными водо- и маслоотталкиванием для синтетических волокон и натуральных волокон. 3 н. и 2 з.п ...

КЛЕИ С НИЗКИМ УРОВНЕМ СОДЕРЖАНИЯ ОСТАТОЧНЫХ МОНОМЕРОВ И СПОСОБ ИХ ПОЛУЧЕНИЯ

Изобретение относится к чувствительным к давлению клеям, которые применяют предпочтительно в косметологии, в пищевом секторе промышленности, в медицинских пластырях, а также в трансдермальных терапевтических системах. Клей содержит один или более олефиновых полимеров, в которых содержание свободных мономеров менее 0,3% по массе. Клей получают гидрогенизацией в присутствии гетерогенного или гомогенного катализатора. 4 с. и 20 з.п.ф-лы, 7 табл.

СПОСОБ И УСТРОЙСТВО ДЛЯ ОЧИСТКИ ГАЗА СО ВСТАВКОЙ ДЛЯ ФОРМИРОВАНИЯ МАССОГО ПОТОКА

Изобретение относится к введению и/или удалению газа из смеси твердая фракция/газ. Описано устройство, содержащее защитную конструкцию, размещенный в ней обратный конус и размещенный под обратным конусом элемент, имеющий размеры, обусловливающие продольное прохождение твердой фазы между элементом и защитной конструкцией с приблизительно постоянным профилем скорости в сечении. Элемент включает выступающую наружу от него юбку и трубопровод для передачи газа к находящейся ниже юбки области или от нее и/или выступающую вовнутрь от него юбку и трубопровод для передачи газа к находящейся над этой юбкой области или от нее. Описан также способ очистки газа из смеси твердая фаза/газ. Технический результат - получение постоянной в сечении скорости потока полимера через очистной резервуар для достижения одинакового времени нахождения в нем полимера и более равномерного распределения очистного газа в полимере. 2 н. и 14 з.п. ф-лы, 5 ил.

СПОСОБ ПОЛУЧЕНИЯ ФТОРПОЛИМЕРНЫХ ПОРОШКОВЫХ МАТЕРИАЛОВ

Изобретение относится к получению фторполимерных порошковых материалов. Получают модифицированный фторполимерный порошковый материал. Получают суспензию твердых частиц фторполимера из группы, включающей полимер фторэтиленпропилена и полимер перфоралкокси-соединений совместно с частицами ПТФЭ в водном жидком носителе. Замораживают водную суспензию. Замороженный носитель удаляют посредством сублимации при давлении ниже атмосферного с получением сухих частиц фторполимера, модифицированного наличием модификатора ПТФЭ в виде порошка. 13 з.п. ф-лы, 3 ил., 1 пр.

СПОСОБ ОБРАБОТКИ ПОЛИОЛЕФИНОВЫХ ЧАСТИЦ, ПОЛУЧЕННЫХ МЕТОДОМ ГАЗОФАЗНОЙ ПОЛИМЕРИЗАЦИИ

Изобретение относится к способу обработки полиолефиновых частиц, полученных методом газофазной полимеризации одного или нескольких олефинов в присутствии каталитической системы полимеризации и алкана C-C, выступающего в качестве растворителя полимеризации в реакторе газофазной полимеризации. Способ включает непрерывное или периодическое сбрасывание полиолефиновых частиц из реактора газофазной полимеризации, передачу частиц на стадию дегазации, состоящую из трех дегазаторов. Частицы полиолефина в первом дегазаторе контактируют с газообразным потоком, содержащим по меньшей мере 85 мол.% алкана C-C. Среднее время пребывания полиолефиновых частиц в первом дегазаторе составляет от 5 минут до 5 часов. Во втором дегазаторе полиолефиновые частицы контактируют с потоком, содержащим азот и водяной пар. Среднее время пребывания полиолефиновых частиц во втором дегазаторе составляет от 5 минут до 2 часов. При этом контактирование осуществляется в условиях отсутствия конденсации влаги. В третьем дегазаторе ...

СПОСОБ СНИЖЕНИЯ СОДЕРЖАНИЯ ЛОС В ПОЛИОЛЕФИНОВОЙ КОМПОЗИЦИИ

РЕКУПЕРАЦИЯ ЭТИЛЕНА И ВИНИЛАЦЕТАТА ИЗ ПОТОКА ОСТАТОЧНОГО ГАЗА, ОБРАЗУЮЩЕГОСЯ В ПРОЦЕССЕ ПОЛУЧЕНИЯ СОПОЛИМЕРА СЛОЖНОГО ВИНИЛОВОГО ЭФИРА И ЭТИЛЕНА

... 1. Способ получения содержащих сложный виниловый эфир и этилен или этиленово ненасыщенные мономеры сополимеров путем радикальной эмульсионной или суспензионной полимеризации в водной среде при абсолютном давлении в пределах от 5 до 100 бар, отличающийся тем, что по завершении полимеризации реакционную смесь дросселируют с понижением ее абсолютного давления до 0,1-5 бар и путем многоступенчатой фракционированной конденсации с глубоким охлаждением из остаточного газа рекуперируют непрореагировавшие мономеры, при условии, что в первой ступени конденсации конденсируют водяной пар при температуре в пределах от 1 до 5°С, во второй ступени конденсации конденсируют винилацетат при температуре в пределах от -90 до -60°С, а в третьей ступени конденсации конденсируют этилен при температуре в пределах от -140 до -100°С. ! 2. Способ по п.1, отличающийся тем, что полученный в жидком виде этилен испаряют при абсолютном давлении в пределах от 1 до 20 бар и затем либо сжимают и возвращают в процесс полимеризации ...

КЛЕИ С НИЗКИМ УРОВНЕМ СОДЕРЖАНИЯ ОСТАТОЧНЫХ МОНОМЕРОВ И СПОСОБ ИХ ПОЛУЧЕНИЯ

... 1. Клей, содержащий один или более олефиновых полимеров, отличающийся тем, что содержание свободных мономеров составляет менее 1% по массе. 2. Клей по п. 1, отличающийся тем, что содержание свободных мономеров составляет менее 0,3% по массе. 3. Клей по п. 1, отличающийся тем, что содержание свободных мономеров составляет менее 0,02% по массе. 4. Клей по п. 1, отличающийся тем, что содержание свободных мономеров составляет менее 0,01% по массе. 5. Клей по п. 1, отличающийся тем, что полимер является гомополимером или смесью различных гомополимеров. 6. Клей по п. 1, отличающийся тем, что полимер является сополимером или смесью различных сополимеров. 7. Клей по п. 1, отличающийся тем, что полимер является блок-полимером или смесью различных блок-полимеров. 8. Клей по п. 1, отличающийся тем, что полимер выбран из группы, состоящей из гомополимера, сополимера, блок-полимера и их смесей. 9. Клей по п. 1, отличающийся тем, что он является чувствительным к давлению. 10. Клей по п. 9, отличающийся ...

ПОЛИАКРИЛОНИТРИЛЬНЫЕ (ПАН) ПОЛИМЕРЫ C НИЗКИМ ИНДЕКСОМ ПОЛИДИСПЕРСНОСТИ (ИПД) И ПОЛУЧАЕМЫЕ ИЗ НИХ УГЛЕРОДНЫЕ ВОЛОКНА

СПОСОБ ПОЛУЧЕНИЯ ЗАЩИТНОГО ПОКРЫТИЯ

Изобретение относится к способам получения покрытий для защиты поверхностей от воздействия окружающей среды. Предложено покрытие на основе фторсодержащих каучуков, которое готовят обработкой раствора фторсодержащего каучука в полярном растворителе, например ацетоне, раствором гидроксида калия при соотношении 100 : 10 - 20. Покрытие наносят слоями, после нанесения каждого слоя его сушат не менее 30 мин. После достижения желаемой толщины покрытия его выдерживают при 100oС в течение пяти часов. Покрытие обеспечивает защиту поверхности от воздействия кислот, растворителей, обладает хорошей адгезией к металлу, не оказывает вредного воздействия на организм человека.

ПОЛИАМИДНЫЙ СОСТАВ И СПОСОБ ЕГО ПОЛУЧЕНИЯ

... 1. Способ получения полиамида или сополиамида, освобожденного от летучих компонентов, путем удаления летучих компонентов, в частности мономеров и димеров, по меньшей мере, в две стадии из полиамида 6 или сополиамида полиамида 6 в расплаве, отличающийся тем, что на первой стадии расплав полимера вводят, в частности при температуре от 200 до 300°С, в кожухотрубный теплообменник 2, выпаривают мономеры или димеры при температуре кожухотрубного теплообменника 2 от 250 до 300°С и удаляют летучие компоненты в последовательно включенном первом сепараторе 3 при давлении не более 300 мбар (300 гПа), предпочтительно от 10 до 300 мбар (от 10 до 300 гПа), особенно предпочтительно от 10 до 30 мбар (от 10 до 30 гПа), при температуре в первом сепараторе 3 от 250 до 300°С, что в полученный дегазированный полимер вводят предпочтительно газообразный разделительный агент 13, в частности азот, благородный газ, диоксид углерода или водяной пар, при молярном отношении разделительного агента к полимеру, по меньшей ...

КРИСТАЛЛИЗУЮЩИЙ КОНВЕЙЕР

... 1. Способ кристаллизации множества полимерных гранул, включающий ! а) подачу множества полимерных гранул на вход пневматической конвейерной системы, при этом множество полимерных гранул содержит кристаллизуемый полимер, имеющий температуру кристаллизации и температуру плавления, и ! b) пневматический перенос множества полимерных гранул от входа к выходу транспортным газом, при этом транспортный газ имеет температуру, достаточную для поддержания температуры множества полимерных гранул в таком диапазоне, чтобы кристаллизация множества полимерных гранул по существу была инициирована или завершена до извлечения гранул из выхода пневматической конвейерной системы. ! 2. Способ по п.1, где часть множества гранул имеет сферическую форму или цилиндрическую форму. ! 3. Способ по п.1, где множество полимерных гранул содержат компонент, выбранный из группы, включающей сложный полиэфир, полиолефины, полистиролы, нейлоны и поликетоны. ! 4. Способ по п.3, где сложным полиэфиром является полимер или сополимер ...

РЕГУЛИРОВАНИЕ ПРОЦЕССА ДЕГАЗАЦИИ ПОЛИМЕРОВ

... 1. Способ осуществления работы вертикального дегазатора с неподвижным слоем, в который непрерывно подают активный полимерный порошок, полученный в каталитическом процессе полимеризации олефинов в реакторе полимеризации, в котором:- условия полимеризации в дегазаторе такие, что в нем образуется дополнительное количество полимера, составляющее от примерно 0,001 до примерно 0,015 от количества, поступившего в дегазатор,- способ дегазации включает введение в указанный дегазатор отпарного газа, включающего от 5 до 60 об.% основного мономера, и- условия дегазации выбирают таким образом, что температура внутри дегазатора поддерживается в диапазоне до плюс или минус 20°C относительно температуры в реакторе полимеризации.2. Способ по п. 1, в котором процесс дегазации включает введение в указанный дегазатор, по меньшей мере, одного агента дезактивации полимеризации, и выбор условий дегазации включает регулирование содержания указанного дезактивирующего агента.3. Способ по п. 2, в котором дезактивирующий ...

СПОСОБ

... 1. Способ полимеризации, включающий следующие стадии:1) полимеризация мономера и сомономера по реакции полимеризации,2) отведение выходящего потока, включающего твердый полимер и смесь, включающую непрореагировавший мономер и непрореагировавший сомономер, и направление выходящего потока в систему извлечения при высоком давлении, причем давление в указанной системе извлечения при высоком давлении составляет, по крайней мере, 0,5 МПа, и указанная система извлечения при высоком давлении включает:а) стадию разделения при высоком давлении для отделения пара, включающего непрореагировавший мономер и непрореагировавший сомономер, от указанных твердых веществ иб) рециркуляционную систему при высоком давлении, где часть пара направляют в рециркуляционную систему реакции полимеризации,3) направление твердых веществ из системы извлечения при высоком давлении в систему извлечения при низком давлении, причем давление в указанной системе извлечения при низком давлении составляет менее 0,5 МПа, и указанная ...

ПОЛИМЕРЫ, ФУНКЦИОНАЛИЗИРОВАННЫЕ РЕАКЦИЕЙ КОХА, И ИХ ПРОИЗВОДНЫЕ

Функционализированный по Коху продукт, который является продуктом реакции по меньшей мере одного полимера со среднечисленной молекулярной массой по крайней мере 500 и по меньшей мере с одной этиленовой двойной связью на каждую полимерную цепь, с моноокисью углерода и нуклеофилулавливающим агентом. В объем изобретения включены функционализированный полимер, его производные и способы их получения.

Способ очистки суспензионных акриловых полимеров

Способ уменьшения неоднородности кислородсодержащих полиэтиленовых восков

СПОСОБ УМЕНЬШЕНИЯ НЕОДНОРОДНОСТИ КИСЛОРОДСОДЕРЖАЩИХ 1ЮЛИЭТИЛЕНОВЫХ ВОСКОВ, получентш путем окисления низкомолекулярных полиэтиленов или путет термоокислительного разложения высокомолекулярных полиэтиленов и обладшсщих молекулярной неоднородностью более 3, отличающийся тем, что окисленный полиэтиленовый воск в виде гранулята; с помосцью водноспиртовой смеси иерколируют при тетшературах ие менее чем на 3 К ниже температуры размягчения окисленного полиэтиленового воска при сохранении формы гранулята. g W с ...

Способ получения катионитовой мембраны

Изобретение может использоваться в водоподготовке, электродиализе, водных растворов. Хлорсульфированную полимерную пленку отмывают гидрофобным растворителем . Обрабатывают смешивающимся с водой органическим растворителем. Повторно обрабатывают 10-80%-ным водным раствором указанного растворителя. Омы- ляют раствором, содержащим 3-7% гидро- ксида щелочного металла, 10-80% органического растворителя, вода - остальное . 1 з. п. ф-лы.З табл....

Способ очистки поливинилхлорида или сополимеров винилхлорида

Способ очистки (со)полимеровВиНилХлОРидА OT (CO)MOHOMEPOB

Способ получения (со)полимеров винилхлорида

Способ получения полиолефинов

Способ получения полиолефинов

Способ отгонки мономера из дисперсии поливинилхлорида и устройство для его осуществления

Способ очистки (со)полимеров стирола от остаточного мономера

Полимерная композиция

Способ удаления летучих из раствора полимеров

Использование: для удаления летучих компонентов из растворов полимеров. Сущность изобретения: способ удаления летучих компонентов, включающий подачу раствора полимера в зону косвенного теплообмена , содержащую множество каналов, расположенных параллельно друг над другом и нагреваемых до температуры, превышающей температуру испарения летучих компонентов вплоть до температуры кипения раствора, продвижение раствора полимера по каждому каналу со скоростью менее 0,5 -мм/с, выдерживание раствора полимера в каждом канале в течение 120- 200 с в целях выпаривания, по меньшей мере, 90% летучих компонентов из указанного раствора полимера, причем разница между температурой теплоносителя и температурой полимерного раствора на выходе из каналов составляет менее 10°С и отделение летучих компонентов от выпаренного раствора полимера. Фиг,7.

Agglomerationsmittellatese mit gebundenem Polyethylenoxid

Verfahren und Vorrichtung zum Entfernen von gasförmigen nichtpolymerisierten Monomeren aus Olefinpolymeren

VERFAHREN ZUR OLEFINPOLYMERISATION

ENTFERNUNG VON BASISCHEN RÜCKSTÄNDEN AUS POLYVINYLALKOHOL-REAKTIONSAUFSCHLÄMMUNGEN

Verfahren zur Herstellung eines superabsorbierenden Polymers

KNOLLENBRECHER ZUM ANSCHLUSS AN EIN REAKTIONSGEFAESS

Verfahren zur Herstellung von elastomermodifizierten Thermoplasten

VERFAHREN ZUR HERSTELLUNG VON HOCHDRUCKPOLYAETHYLEN

Ethylen/Alpha-Olefin/7-Methyl-1,6-Octadien Copolymerisat-Kautschuk und Zusammensetzungen desselben

Herstellungsverfahren mikroskopisch feiner, gefärbter Teilchen und elektrophotographische Toner die die Teilchen umfassen

Dampfreinigung von körnigen EPDM-Harzen.

VERFAHREN ZUR HERSTELLUNG VON AETHYLENCOPOLYMEREN

VERFAHREN ZUR NIEDERDRUCKCOPOLYMERISATION VON ETHYLEN MIT (ALPHA)-OLEFINEN UND ETHYLENCOPOLYMERISATE MIT NIEDEREM RESTMONOMERENGEHALT

VERFAHREN ZUR HERSTELLUNG VON ACRYLVERBINDUNG-MALEINSAEUREANHYDRID-MISCHPOLYMERISATEN IN LOESUNG

VERFAHREN ZUR HERSTELLUNG GERADKETTIGER PERFLUORIERTER OLEFINE MITTLERER KETTENLAENGE

TREATING DISPERSIONS OF ACRYLONITRILE POLYMERS

VERFAHREN ZUR REDUKTION DER EMISSION VON KOHLENWASSERSTOFFEN BEI ENTSPANNUNGSVORGAENGEN AN HOCHDRUCKPOLYMERISATIONSREAKTOREN.

Continuous high pressure polymerisation systems for ethylene (co)polymerisation operate at 500-5000 bar and 150-400 deg.C and the unreacted gas is recycled to the polymerisation system through the high pressure recirculation system after relieving the pressure to 200-400 bar. If given pressure and/or temp. limits are exceeded or other difficulties occur, the pressure is relieved rapidly to a value below the polymerisation pressure by opening valve(s) and passing the hot reaction mixt. from the polymerisation system through expansion pipe(s) and sepn. system(s) into the atmos. The novelty is that, when the pressure is relieved, the polymerisation system is cut off into several sub-sections at the same time and only the sub-section in which the pressure is relieved into the atmos.

VERFAHREN ZUR KONTINUIERLICHEN ENTFERNUNG VON MONOMEREN AUS WAESSRIGEN DISPERSIONEN VON POLYMEREN

WASSERABSORBIERENDES HARZ, ABSORBIERENDES MATERIAL UND VERFAHREN ZUR HERSTELLUNG DERSELBEN

VERFAHREN ZUR RUECKGEWINNUNG GAS- UND/ODER DAMPFFOERMIGER MONOMERER AUS REAKTIONSABGASEN

VORRICHTUNG ZUM KONZENTRIEREN EINER LOESUNG ODER SUSPENSION BIS ZUM PLASTISCHEN ZUSTAND

Polyvinylalkoholpfropfcopolymer und Verfahren zu seiner Herstellung

VERFAHREN ZUR BEHANDLUNG VON GAS-STRÖMEN BEI DER POLYOLEFINHERSTELLUNG

VERFAHREN UND VORRICHTUNG ZUR REINIGUNG VON POLYMERISATIONSSUBSTANZEN

CONTINUOUS PROCESS FOR PRODUCING HOMO- AND COPOLYMERS OF ETHYLENE

ENTGASUNGSVORRICHTUNG

PROCESS FOR PRODUCING A CHLOROPRENE POLYMER

PROCESS FOR REMOVING LINEAR POLYMERS IN GRANULAR FORM FROM A TREATMENT ZONE

NICHT-OXIDATIVES VERFAHREN ZUR REINIGUNG WAESSRIGER ANORGANISCHER, BEIM NASSPINNEN VON FILAMENTARTIGEN VINYLPOLYMEREN VERWENDETEN SALZLOESUNGEN

Verfahren zur Herstellung von Ethylen-Vinylalkohol-Copolymerharz, Verfahren zur Herstellung von Pellets und Harzpellets

POLYACRYLAMID HYDROGEL UND SEINE VERWENDUNG ALS ENDOPROTHESE

EINHEIT ZUR BEHANDLUNG VON PELLETS

KLAEREN VON TRUEBEN ODER INDUSTRIEABWAESSERN DURCH VERWENDEN EINES WASSERLOESLICHEN VINYLADDITIONSPOLYMEREN

WATER SOLUBLE POLYMERS

POLYMER DISPERSIONS

Water-in-oil emulsions of amidase and of acrylamide polymers

The present invention provides for a water-in-oil emulsion characterized by the aqueous phase of the water-in-oil emulsion containing Amidase. Also provided is an improved method of treating water-in-oil emulsions of acrylamide polymers to reduce the acrylamide content thereof, characterized by adding the Amidase in the form of a water-in-oil emulsion.

Method for producing saponified ethylene-vinyl acetate copolymer and removal of vinyl acetate therefrom.

The present invention provides methods for producing an ethylene-vinyl acetate copolymer and a saponified product thereof that can inhibit visible imperfections (particularly discoloration) at the time of molding by improving the process for recovering vinyl acetate. When the alcohol-based solvent to be blown in when recovering vinyl acetate is deoxidized so that its oxygen concentration becomes not more than 60 ppm, discoloration of a molded product of the above saponified product due to oxygen can be inhibited.

PRODUCING STYRENIC/ALKENYLNITRILE COPOLYMERS

Method for producing saponifield ethylene-vinyl acetate copolymer

STRIPPING VOLATILE MATERIAL FROM AN AQUEOUS LATEX

METHOD AND APPARATUS FOR INHIBITING THE FORMATION OF POLYMERIZED VINYLAROMATIC COMPOUNDS DURING DISTILLATIVE PURIFICATION OF VINYLAROMATIC MONOMER

Preparation of water-soluble polymers having a low residual monomer content.

High molecular weight water-soluble polymers essentially devoid of residual monomer content and well adapted for use as flocculating agents, are prepared by photopolymerizing a thin layer of a deoxygenated aqueous solution of an olefinically unsaturated monomer continuously deposited upon a travelling support substrate, said aqueous solution containing a photopolymerization photoinitiator and said photoinitiator comprising benzil dimethylacetal.

TREATMENT OF KERATIN-CONTAINING FIBRES

PROCESS FOR DESICCANT DRIER REGENERATION

... 1417742 Dessicant regeneration in olefin copolymerization EXXON RESEARCH & ENG CO 27 June 1973 [13 July 1972] 30508/73 Heading C3P An ethylene--olefin copolymerization process in which the steps of (a) diluent purification and recycle and (b) regeneration of the dessicant drier used to dehydrate the -olefin monomer feed, using a portion of the dry recycle diluent, are integrated into the copolymerization procedure. In this manner, the diluent employed for regeneration is returned to the purification zone (a) after removal of water from the drier. Ziegler catalysts are used in the copolymerization. The diluent used in regeneration may be a vapour or liquid. In the former case a further step of cooling the drier may be necessary, e.g. by passage of dry liquid diluent therethrough. It is also preferred to flush the drier with - ol'efin vapour prior to regeneration, to remove residual liquid monomer therefrom. The polymerization is preferable applied to ethyl'enepropyl'ene-non-conjugated diene ...

POLYOLEFIN COMPOSITIONS

PRODUCING MULTIPLE MONOLAYERS OF POLYMERIC LINKAGES

PROCESS AND APPARATUS FOR THE PRODUCTION OF FIBRILLATED MATERIAL

... 1,274,478. Polymerisation apparatus. SOLVAY & CIE. 9 Dec., 1969 [13 Dec., 1968], No. 60067/69. Heading B1X. [Also in Division C3] Apparatus for the production of fibrillated polyethylene comprises reactor 1 provided with a stirrer, one or more inlets 2, 3, 4 for feeding ethylene, catalyst and diluent, a gas-removing enclosure 6 also having a stirrer and connected to reactor I by a channel which has an expansion valve 5, heating means for heating the suspension of polymer after removal of gas therefrom, the heating means comprising polymer liquefying vat 9 and/or heat exchanger 13, and being connected to the gas-removing enclosure 6 by a channel, extrusion means 15 fed from the heating means and extruding into enclosure 18 for instantaneously vaporizing the diluent, the product then leaving at 20, and optionally filtration means 14, and pressure control means 16, 17.

METHOD OF AND APPARATUS FOR REMOVING A SMALL AMOUNT OF IMPURITY FROM A HIGHLY VISCOUS POLYMER SOLUTION

... 1353937 Liquid/liquid extraction of highly viscous polymer solutions BRIDGESTONE TIRE KK and MITSUBISHI JUKOGYO KK 6 July 1971 [6 July 1970] 31650/71 Heading B1F A method of removing impurity from a highly viscous polymer solution comprises cbntinuously charging the solution via 5, and charging low viscosity immiscible solution via 7 and 7', into cylinder 1, and rotating shafts 3, 3' in opposite directions so that the highly viscous solution substantially avoids contact with the inside of cylinder 1 due to being retained by members 4, 4'. The treated highly viscous solution passes through the central opening in baffle 11, and is urged by roller 12 to outlet 6 for continuous discharge. Examples of solutions and impurities are given.

Process for removing volatile components from low molecular weight copolymer solutions

WATER ABSORBENT RESIN PARTICLES OF CROSSLINKED CARBOXYL CONTAINING POLYMERS AND METHOD OF PREPARATION

MELT FINISHING PROCESS FOR POLYMERS PRODUCED BY VAPOUR STATE POLYMERIZATION

... 1490457 Melting of solid polymers by further in situ polymerization STANDARD OIL CO 16 Dec 1975 [16 Dec 1974] 51469/75 Heading C3P Solid polymer produced by vapour-phase polymerization is melted by contacting with monomer in a post-polymerization zone within which further polymerization occurs; the heat generated during this post-polymerization step is retained to provide heat required to melt the polymer. The examples describe the polymerization of ethylene and propylene using Ziegler catalysts, the melting of the solid polymer product being effected by further polymerization of monomer carried over from the main polymerization process.

PROCESS FOR REDUCING THE CONTENT OF VINYL CHLORIDE MONOMER REMAINING IN SLURRY OF POLYVINYLCHLORIDE RESIN

... 1512469 Removing unreacted vinyl chloride from polymerized slurries SUMITOMO CHEMICAL CO Ltd 13 May 1976 [14 May 1975 15 May 1975] 19859/76 Heading C3L The concentration of unreacted vinyl chloride monomer is reduced in a polymerized slurry obtained by the suspension polymerization of vinyl chloride with optionally a comonomer in a polymerization vessel, by jetting the slurry at 40-100‹ C. down into the gas phase portion of a vessel maintained at below atmospheric pressure. Steam may be mixed with the slurry which may be jetted in the form of a continuous stream of droplets against the wall of the vessel, which may be the polymerization vessel.

MANUFACTURE OF HIGH PRESSURE ETHYLENE POLYMERS

Combined emulsion and suspension process for producing graft ABS bead-like particles

A method of preparing a graft ABS polymer comprising first preparing a rubbery graft ABS polymer by emulsion polymerizing acrylonitrile and styrene in the presence of a rubber, coagulating the emulsion and then polymerizing a mixture of acrylonitrile and styrene in the presence of the coagulant and an organic or inorganic suspending agent to form bead-like particles of ABS.

PROCESS FOR REMOVAL AND RECOVERY OF UNREACTED MONOMERS FROM RESINOUS POLYMERS

... 1494710 Removal and recovery of monomers from a polymer latex STANDARD OIL CO 21 March 1975 [12 April 1974] 11881/75 Heading C3P Monomers are removed and recovered from a polymer latex produced by emulsion polymerization and having a heat distortion temperature of above 0‹ C. in a process which comprises: (a) coagulating the polymer latex with an aqueous electrolyte; (b) heating a slurry of the resulting coagulated polymer particles obtained in step (a) in an aqueous bath maintained at a temperature in the range of from 10‹ C. above to 10‹ C. below the heat distortion temperature and at a temperature of 0-100‹ C. to obtain particles having sufficient porosity to retain from 25-60% by weight of moisture on a wet strand basis, and to remove some of the moisture therefrom; (c) separating the excess water from the aqueous slurry of the polymeric particles in step (b); (d) washing the wet polymeric particles from step (c) in an aqueous bath maintained at a temperature of from 20‹ C. below the ...

LOW-EMISSION REMOVAL OF VINYL CHLORIDE FROM POLYMERS OF VINYL CHLORIDE

... 1519227 Vinyl chloride monomer recovery BASF AG 17 Oct 1975 [24 Oct 1974] 42647/75 Heading C3L Vinyl chloride monomer is recovered from an aqueous settling dispersion of vinyl chloride polymer by mechanical dehydration followed by treating the moist polymer at 40-140‹ C. while purging with steam; monomer is recovered from the effluent steam and the treated polymer is dried. The dispersion may be a suspension polymer or a coagulated latex.

PROCESS FOR RECOVERING UNREACTED MONOMER

METHOD OF PRODUCTION OF COAGULATED POLYMER LATEX

... 1516476 Coagulating a resin latex KANEGAFUCHI KAGAKU KOGYO KK 1 June 1976 [2 June 1975] 22619/76 Heading C3L A latex of a resin is coagulated by dispersing the latex as a spray of liquid drops (e.g. via spray device 2) into an atmosphere 4 containing a coagulating gas and/or spray, supplied at 5, and recovering the spherical coagulated particles in a liquid medium 7 (aqueous or organic) held in the chamber 6. Optional process features include a liquid 10 acting as a seal between the coagulating atmosphere 4 and the recovery medium 7 and means 12 to wash the walls of the chamber. Further additives may be introduced via line 23 and a coagulating agent may also be present in 7, introduced via line 21. Typical examples refer to the coagulation of latexes of styrene/methacrylate graft copolymer on styrene/butadiene copolymer, a blend of styrene/methylmethacrylate grafted on polybutadiene together with a copolymer of alphamethyl styrene/methylmethacrylate/styrene/ acrylonitrile, or vinyl chloride ...

PROCESS FOR THE AFTER-TREATMENT OF PASTE-FORMING POLYMERS VINYL CHLORIDE

PROCESS FOR THE REMOVAL OF VINYL CHLORIDE FROM AQUEOUS VINYL CHLORIDE POLYMER DISPERSIONS

... 1510339 Removing monomers from PVC dispersions CHEMISCHE WERKE HULS AG 28 Aug 1975 [29 Aug 1974 7 Sept 1974] 35515/75 Heading C3L The unconverted vinyl chloride content of PVC dispersions is reduced below 50 p.p.m. by heating to boiling at 80-100‹ C. for 3-60 minutes by the action of indirect heat and/or steam to give an evaporation rate of 0À006-0À2 kg. of steam and vinyl chloride evaporated per kg. of polymer per minute. In a continuous process the dispersion is heated in an intermediate container to 80-100‹ C. and the pressure adjusted to effect boiling, then passed to a degassing tower where it is contacted in countercurrent with steam.

Improvements in and relating to the use of semipermeable membranes

A process for improving the performances of semipermeable membranes which comprise an acrylonitrile polymer containing 40 to 100% by mole of acrylonitrile and have a bubble point of more than 0.1 kg/cm2, by dipping said membranes in an aqueous solution containing inorganic salts and/or protic acids.

METHOD FOR PRODUCING PETROLEUM RESIN

A method for producing a petroleum resin including removing a low-molecular mist by means of a filter. 1. A method for producing a petroleum resin , comprising:removing a low-molecular mist with a filter.2. A method for producing a hydrogenated petroleum resin , the method comprising:polymerizing a cyclopentadiene-based compound and an aromatic vinyl compound, thereby obtaining a polymer;hydrogenating the polymer to prepare a molten hydrogenated petroleum resin; andgranulating the molten hydrogenated petroleum resin, thereby obtaining hydrogenated petroleum resin pellets,wherein the granulating comprises sucking a low-molecular mist generated from the molten hydrogenated petroleum resin through a suction path having a filter in a granulator, and removing the low-molecular mist with the filter.3. The method of claim 2 , wherein the filter is a glass fiber layer filter.4. The method of claim 2 ,wherein the granulating comprises: adding the molten hydrogenated petroleum resin dropwise to a steel belt in the granulator providing the suction path at any position of the steel belt where the molten hydrogenated petroleum resin is not solidified andthe granulator is a roll-drop granulator.5. The method of claim 1 , wherein the petroleum resin is a copolymer or a hydrogenated polymer.6. The method of claim 2 , wherein the petroleum resin is a copolymer or a hydrogenated polymer.7. The method of claim 2 , wherein the cyclopentadiene-based compound is cyclopentadiene claim 2 , methylcyclopentadiene claim 2 , ethylcyclopentadiene claim 2 , a dimer of cyclopentadiene claim 2 , a dimer of methylcyclopentadiene claim 2 , a dimer of ethylcyclopentadiene claim 2 , a co-dimer of cyclopentadiene claim 2 , a co-dimer of methylcyclopentadiene claim 2 , or a co-dimer of ethylcyclopentadiene.8. The method of claim 2 , wherein the vinyl compound is styrene claim 2 , α-methylstyrene claim 2 , or vinyltoluene.9. The method of claim 2 , wherein the polymerizing is a thermal polymerization in ...

PROCESS FOR PRODUCING (METH)ACRYLIC RESIN COMPOSITION

A method for producing a (meth)acrylic resin composition, the method comprising continuously feeding a polymerizable monomer component comprising 50 to 100% by mass of methyl methacrylate, 0 to 20% by mass of an acrylic acid alkyl ester and 0 to 30% by mass of an additional monomer, a chain transfer agent, and a radical polymerization initiator to a tank reactor; conducting bulk polymerization of the polymerizable monomer component at a polymerization conversion ratio of 40 to 70% by mass to obtain a liquid containing a (meth)acrylic resin; continuously feeding the liquid to a vented extruder to separate a volatile component from the (meth)acrylic resin; continuously feeding the separated volatile component to a distillation column to obtain a fraction containing methyl methacrylate; adding a polymerization inhibitor to the fraction; and reusing the fraction which contains the polymerization inhibitor as part of the polymerizable monomer component. 1: A method for producing(meth)acrylic resin composition , the method comprising:continuously feeding a polymerizable monomer component comprising 50 to 100% by mass of methyl methacrylate, 0 to 20% by mas of an acrylic acid alkyl ester and 0 to 30% by mass of an additional monomer, a chain transfer agent, and a radical polymerization initiator to a tank reactor;conducting bulk polymerization of the polymerizable monomer component at a polymerization conversion ratio of 40 to 70% by mass to obtain a liquid containing a (meth)acrylic resin;continuously feeding the liquid to a vented extruder to separate a volatile component from the (meth)acrylic resin;continuously feeding the separated volatile component to a distillation column to obtain a fraction containing methyl methacrylate;adding a polymerization inhibitor to the fraction; andreusing the traction which contains the polymerization inhibitor as part of the polymerizable monomer component.2: The method according to claim 1 , further comprising refluxing part of the ...

Spiral Heat Exchanger as Preheater in Polymer Devolatilization Processes

This invention relates to a process for forming polymer including: polymerizing a monomer dissolved in a solvent in the presence of a catalyst system under conditions to obtain a first effluent stream including a solution of the polymer and the solvent; heating the first effluent stream in at least one spiral heat exchanger to produce a second effluent stream, where the first effluent stream flows through the spiral heat exchanger in a cross-flow direction relative to spirals of the spiral heat exchanger and performing a separation on the second effluent stream to produce: a third effluent stream including polymer substantially free of the solvent; and a recycle stream including the solvent and unreacted monomer. Processes for devolatilizing a polymer stream are also provided herein. 1. A process for producing a polymer comprising:polymerizing a monomer dissolved in a solvent in the presence of a catalyst system to obtain a first effluent stream, comprising a solution of polymer in the solvent;heating the first effluent stream in at least one spiral heat exchanger to produce a second effluent stream, wherein the first effluent stream flows through the at least one spiral heat exchanger in a cross-flow direction relative to spirals of the at least one spiral heat exchanger; and 'a third effluent stream comprising polymer substantially free of the solvent and a recycle stream comprising the solvent and unreacted monomer.', 'separating the second effluent stream in a vessel into2. The process of claim 1 , wherein pressure drop across the at least one spiral heat exchanger is less than or equal to about 345 kPa.3. The process of claim 1 , wherein the second effluent stream has a temperature at the outlet of the at least one spiral heat exchanger of about 75° C. to about 215° C.4. The process of claim 1 , wherein the second effluent stream is separated in the vessel at an average vessel temperature of about 75° C. to about 215° C. and an average vessel pressure of about ...

METHOD OF PREPARING AROMATIC VINYL COMPOUND-VINYL CYANIDE COMPOUND POLYMER AND APPARATUS FOR PREPARING THE SAME

The present invention relates to a method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer including a step of separating volatile components from a polymerization product containing an aromatic vinyl compound-vinyl cyanide compound polymer, a residual aromatic vinyl monomer, a residual vinyl cyanide monomer, and an organic solvent using a volatilization tank, and a step of condensing the separated volatile components using a condenser, wherein an organic solvent or an aromatic vinyl monomer is sprayed onto the volatile components being transferred to the condenser. Volatile components may be fully condensed in a condenser, thereby significantly reducing the amount of volatile components discharged to the outside without being condensed. Therefore, wastewater treatment costs consumed in treating the volatile components may be reduced, and the amount of vinyl cyanide monomers harmful to the human body discharged into the atmosphere may be significantly reduced. 1. A method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer , comprising:separating volatile components from a polymerization product containing an aromatic vinyl compound-vinyl cyanide compound polymer, residual aromatic vinyl monomer, residual vinyl cyanide monomer, and an organic solvent using a volatilization tank; andcondensing the separated volatile components using one condenser or two or more condensers connected in series,wherein the method comprises spraying an organic solvent onto the separated volatile components being transferred from the volatilization tank to the condenser; orspraying an organic solvent or an aromatic vinyl monomer onto the volatile components not being condensed in a first condenser and being transferred to a second condenser when the two or more condensers connected in series are used.2. The method according to claim 1 , wherein the method comprises spraying the organic solvent onto the volatile components being transferred to the ...

DEVOLATILIZATION OF PLASTOMER PELLETS

The devolatilization of plastomer pellets is undertaken using nitrogen that is recycled in the process. Volatile hydrocarbons are removed from the nitrogen in a hydrocarbon extraction vessel (e.g. an adsorbent bed). In an embodiment, the recycled nitrogen contains less than 300 ppm of volatile hydrocarbons after being treated in the adsorbent bed. 1. A process for the production of devolatilized ethylene-alpha copolymer having a density of from about 0.865 to 0.905 g/cc and a melt index , 12 , of from about 0.3 to 30 g/10 minutes as measured by ASTM D1238 at a temperature of 190° C. using a 2.16 kg load , said process comprising:i) providing raw pellets of ethylene-alpha olefin copolymer to a devolatilization bin, wherein said raw pellets are characterized by containing volatile hydrocarbon;ii) providing nitrogen gas to said devolatilization bin;iii) discharging devolatilized pellets from said devolatilization bin, wherein said devolatilized pellets contain a lower level of said volatile hydrocarbon than said raw pellets;iv) recovering mixed stripper gas comprising a mixture of nitrogen and hydrocarbon from an overhead portion of said devolatilization bin;v) directing said mixed stripper gas to a hydrocarbon extraction vessel;vi) recovering purified nitrogen from said hydrocarbon extraction vessel; andvii) recycling said purified nitrogen to said devolatilization bin.2. A process for the production of devolatilized ethylene-alpha copolymer having a density of from about 0.865 to 0.905 g/cc and a melt index , 12 , of from about 0.3 to 30 g/10 minutes as measured by ASTM D1238 at a temperature of 190° C. using a 2.16 kg load , said process comprising:i) providing raw pellets of ethylene-alpha olefin copolymer to a top portion of a devolatilization bin, wherein said raw pellets are characterized by containing volatile hydrocarbon;ii) providing a nitrogen gas as an upflow to a bottom portion of said devolatilization bin, wherein said nitrogen gas is provided at a ...

PROCESS FOR STRIPPING AN AQUEOUS DISPERSION OF POLYMERIC BEADS

A process of stripping aqueous dispersion of polymeric beads with volatile organic compounds and an aqueous polymer composition obtained by the process. 1. A process for stripping an aqueous dispersion of polymeric beads with volatile organic compounds , comprising:admixing an aqueous dispersion of a film-forming polymer with the aqueous dispersion of polymeric beads with volatile organic compounds to form an admixture, wherein the film-forming polymer has a particle size in the range of from 30 nm to 400 nm, wherein the polymeric beads have a particle size in the range of larger than 4.5 μm to 50 μm, and wherein the weight ratio of the film-forming polymer to the polymeric beads is in the range of from 55:45 to 99:1;steam stripping the admixture; andadding a thickener.2. The process of claim 1 , wherein the polymeric beads have a dry density in the range of from 1.01 to 1.10 g/cm.3. The process of claim 1 , wherein the polymeric beads have a particle size of from 4.6 to 25 μm.4. The process of claim 1 , wherein the thickener is present in an amount of from 0.1% to 5% claim 1 , by dry weight based the total weight of the film-forming polymer and the polymeric beads.5. The process of claim 1 , wherein the thickener is selected from the group consisting of associative thickeners claim 1 , partially associative thickeners claim 1 , non-associative thickeners claim 1 , and mixtures thereof.6. The process of claim 1 , wherein the film-forming polymer has a minimum film formation temperature in the range of from −10 to 40° C.7. The process of claim 1 , wherein the polymeric beads comprise less than 5% of structural units of a carboxylic acid monomer claim 1 , by weight based on the weight of the polymeric beads.8. The process of claim 1 , wherein the weight ratio of the film-forming polymer to the polymeric beads is in the range of 60:40 to 90:10.9. The process of claim 1 , wherein steam stripping is a continuous or batch process.10. The process of claim 1 , wherein steam ...

Process for preparing polypropylene with improved recovery

Described herein is a process for producing a propylene copolymer in at least a pre-polymerization stage, a first and a second reaction stage connected in series with improved monomer recovery, wherein a product stream, comprising a propylene polymer mixture, unreacted propylene, unreacted ethylene and hydrogen, if present, is separated in a separation unit into a first overhead stream and a first bottom product stream, wherein the desired propylene polymer mixture is recovered from the first bottom product stream. The first overhead stream is at least partially condensed, passed to a distillation column and separated into a second overhead stream and a second bottom product stream. The second overhead stream is at least partially condensed and split into three distinct streams, wherein a distillation reflux stream is returned into the distillation column, a first recycle stream is passed to the second reaction stage and a second recycle stream is passed to a stripping column from where a third bottom product stream is withdrawn and at least a part of it is passed to a propylene feed vessel, to the pre-polymerisation stage, to the first reaction stage, or to a combination thereof. Further disclosed is a polymerization unit, particularly suitable for carrying out the inventive process. 1. Process for producing a propylene copolymer in at least three reaction stages connected in series , comprising the steps of:a) pre-polymerizing a polymerization catalyst by introducing propylene, optionally ethylene, optionally hydrogen, the polymerization catalyst and optionally cocatalyst into a pre-polymerization stage to produce a pre-polymerized polymerization catalyst;b) withdrawing the pre-polymerized polymerization catalyst from the pre-polymerization stage and passing it to a first reaction stage;c) polymerizing propylene by introducing propylene, ethylene, and optionally hydrogen into the first reaction stage to produce a first reaction mixture comprising a first propylene ...

METHOD FOR REDUCING ODORIFEROUS AND/OR TOXIC RESIDUAL MONOMER IN A LATEX

The present invention relates to a new and efficient toxicity and/or odor reducing method for ethyl acrylate and/or acrylonitrile contained aqueous polymer dispersion.

Removal of Unreacted Monomers and Other Materials from Polyolefin Product Particles

A method for the removal of unreacted olefin monomer(s) from polyolefin product particles of an olefin polymerization reaction, the method including: contacting the polyolefin product particles with a countercurrent flow of a purge gas in a purge vessel under conditions allowing diffusion of unreacted monomer and other gaseous substances from the polyolefin product particles into the countercurrent flow of the purge gas to produce purged particles; wherein the velocity of the purge gas exceeds 50% of the calculated minimum fluidization velocity of the polyolefin product particles in the purge vessel (U), is provided. 1. A method for the removal of unreacted olefin monomer(s) from polyolefin product particles of an olefin polymerization reaction , the method comprising:contacting the polyolefin product particles with a countercurrent flow of a purge gas in a purge vessel under conditions allowing diffusion of unreacted monomer and other gaseous substances from the polyolefin product particles into the countercurrent flow of the purge gas to produce purged particles;{'sub': 'mf', 'wherein the velocity of the purge gas exceeds 50% of the calculated minimum fluidization velocity of the polyolefin product particles in the purge vessel (U).'}2. The method of claim 1 , in which the velocity of the purge gas is ≥85% of the calculated U.3. The method of claim 1 , in which the velocity of the purge gas is in the range from 85% to 95% of the calculated U.4. The method of claim 1 , in which the velocity of the purge gas is ≥90% of the calculated U.5. The method of claim 1 , in which the velocity of the purge gas is in the range from 90% to 105% of the calculated U.6. The method of claim 1 , in which the velocity of the purge gas is ≥100% of the calculated U.7. The method of claim 1 , in which the velocity of the purge gas is in the range from 105% to 135% of the calculated U.9. The method of claim 1 , in which the polyolefin product particles have a density that ranges from 0. ...

STRIPPING APPARATUS

The present application relates to a method for removing an unreacted vinyl chloride monomer (VCM) in polyvinyl chloride (PVC). According to an illustrative stripping apparatus and a stripping method using the stripping apparatus of the present application, in a stripping process using steam, a temperature difference between a raw material including a target substance to be removed and steam is minimized to suppress foam generation in the stripping process, thereby increasing efficiency of removing the target substance to be removed, particularly, an unreacted VCM in PVC. In addition, a cleansing cycle to remove foams generated in the stripping apparatus can be reduced, thereby not only securing economic feasibility of the process, but also preventing degradation in quality of a final product that may occur when an antifoamer to remove the foams is used. 1. A stripping apparatus comprising:a raw material supply device;a steam supply device; anda stripping column,wherein the stripping column is divided into:a raw material supply region fluidically connected to the raw material supply device;a steam supply region fluidically connected to the steam supply device; anda stripping region between the raw material supply region and the steam supply region,and wherein:a raw material including an emulsion polymerization product of a monomer is introduced into the raw material supply region through the raw material supply device;the introduced raw material passes through the stripping region and is stripped;steam is introduced into the steam supply region through the steam supply device; andthe introduced steam passes through the stripping region, and heats and strips the introduced raw material.2. The stripping apparatus according to claim 1 , wherein the monomer is a vinyl chloride monomer (VCM).3. The stripping apparatus according to claim 1 , wherein the raw material comprises polyvinyl chloride (PVC) and an unreacted VCM.4. The stripping apparatus according to claim 1 , ...

METHOD FOR PRODUCING CLEAN THERMOPLASTIC PARTICLES

A process for increasing purity of a low density polyethylene (LDPE) composition, comprising the steps of: a) providing a melted composition comprising LDPE having Mn of at least 5.0 kg/mol according to size exclusion chromatography, Mw of at least 50 kg/mol according to size exclusion chromatography, a density of 915 to 935 kg/maccording to ISO1183 and a melt flow rate of 0.10 g/10 min to 80 g/10 min according to ISO1133:2011 measured at 190° C. and 2.16 kg, and b) providing particles from the melted composition by: b1) mixing a supercritical fluid in the melted composition to obtain a solution saturated with the supercritical fluid and b2) expanding the solution through an opening to obtain the particles. 1. A process for increasing purity of a low density polyethylene (LDPE) composition , comprising the steps of:{'sup': '3', 'a) providing a melted composition comprising LDPE having Mn of at least 5.0 kg/mol according to size exclusion chromatography, Mw of at least 50 kg/mol according to size exclusion chromatography, a density of 915 to 935 kg/maccording to ISO1183 and a melt flow rate of 0.10 g/10 min to 80 g/10 min according to ISO1133:2011 measured at 190° C. and 2.16 kg, and'} b1) mixing a supercritical fluid in the melted composition to obtain a solution saturated with the supercritical fluid and', 'b2) expanding the solution through an opening to obtain the particles., 'b) providing particles from the melted composition by2. The process according to claim 1 , wherein the supercritical fluid is selected from the group consisting of CO claim 1 , NH claim 1 , HO claim 1 , NO claim 1 , CH claim 1 , ethane claim 1 , propane claim 1 , propylene claim 1 , n-butane claim 1 , i-butane claim 1 , n-pentane claim 1 , benzene claim 1 , methanol claim 1 , ethanol claim 1 , isopropanol claim 1 , isobutanol claim 1 , chlorotrifluoromethane claim 1 , monofluoromethane claim 1 , toluene claim 1 , pyridine claim 1 , cyclohexane claim 1 , cyclohexanol claim 1 , o-xylene claim ...

PROCESS FOR THE PRODUCTION OF A POLYMER USING A COMPOUND COMPRISING AT LEAST 2 UNSATURATED CARBON-CARBON BONDS

The present invention relates to a process for the production of a polymer using a compound comprising at least 2 unsaturated carbon-carbon bonds, wherein the process comprises a polymerisation section and a purification section, wherein the product from the polymerisation section is subjected in the purification section to a sequence of purification steps comprising: ⋅removal of the vapour phase from the product from the polymerisation section by means of flash separation to obtain a first vapour phase and a polymerisation product; ⋅subjecting the first vapour phase to a compression and condensation treatment to obtain a second vapour phase and a condensed monomer phase; wherein the purification steps are conducted in this order. Such process allows for the optimal utilisation of raw materials in the polymerisation process. 1. A process for the production of a polymer using a compound comprising at least 2 unsaturated carbon-carbon bonds , wherein the process comprises a polymerisation section and a purification section , wherein the product from the polymerisation section is subjected in the purification section to a sequence of purification steps comprising:removing the vapour phase from the product from the polymerisation section by means of flash separation to obtain a first vapour phase and a polymerisation product; andsubjecting the first vapour phase to a compression and condensation treatment to obtain a second vapour phase and a condensed monomer phase;wherein the purification steps are conducted in this order.2. The process according to claim 1 , wherein the compound comprising at least 2 unsaturated carbon-carbon bonds is selected from a butadiene claim 1 , a pentadiene claim 1 , a hexadiene claim 1 , a heptadiene claim 1 , an octadiene claim 1 , or combinations thereof.3. The process according to claim 1 , wherein the compound comprising at least 2 unsaturated carbon-carbon bonds is 1 claim 1 ,3-butadiene.4. The process according to claim 1 , wherein ...

Purification of Plasticizer and Use Thereof in a Polymer Production Process and Plant

The invention relates to purification of plasticizer, particularly for use in a polymer production process and plant. More particularly, the invention relates to purification of plasticizer, such as by gas stripping, for use in a process for in-line blending of polymer and plasticizer.

SYSTEMS AND METHODS USING AN INSERT ASSEMBLY WITH STACKED GAS FLOW GAPS

Disclosed are insert assemblies with stacked gas flow gaps to add and/or remove gases from a solid/gas mixture travelling through a barrier. An example system may comprise a barrier and an insert assembly in the barrier defining an annulus between the insert assembly and the barrier, wherein the insert assembly comprises stacked flow gaps configured for addition and/or removal of gas from a solid/gas mixture flowing in the annulus. 1. A system , comprising:a barrier; andan insert assembly in the barrier defining an annulus between the insert assembly and the barrier, wherein the insert assembly comprises stacked flow gaps for addition and/or removal of gas from a solid/gas mixture flowing in the annulus.2. The system as recited in claim 1 , wherein the insert assembly causes the solid/gas mixture flowing in the annulus to have about a constant velocity profile there across.3. The system as recited in claim 1 , wherein the insert assembly comprises a series of stacked inverted cones.4. The system as recited in claim 1 , wherein the insert assembly comprises an inverted cone and a member under the inverted cone.5. The system as recited in claim 4 , wherein the member comprises: an uppermost member section having a tapered portion extending into the inverted cone; a middle member section extending into a lower portion of the uppermost member section; and a lowest member section having a tapered portion extending into a lower portion of the middle member section.6. The system as recited in claim 5 , wherein the middle member section is tapered from bottom to top.7. The system as recited in claim 5 , wherein a chamber in the uppermost middle section is not in fluid communication with a chamber in the inverted cone claim 5 , and wherein a chamber in the middle member section is in fluid communication with the chamber in the uppermost middle section.8. The system as recited in claim 4 , further comprising a gas inlet for transporting a purge gas to an area below the ...

Systems and Methods for Polyethylene Recovery with Low Volatile Content

The present invention discloses methods for removing volatile components from an ethylene polymer effluent stream from a polymerization reactor, and related polyethylene recovery and volatile removal systems. In these methods and systems, the polymer solids temperature is increased significantly prior to introduction of the polymer solids into a purge column for the final stripping of volatile components from the polymer solids. 1. A method for removing volatile components from an ethylene polymer effluent stream from an ethylene polymerization reactor , the method comprising:(i) reducing a pressure of the effluent stream to remove a first portion of the volatile components from polymer solids, the polymer solids having a solids temperature from about 10° F. to about 50° F. less than a reaction temperature in the ethylene polymerization reactor;(ii) fluidizing the polymer solids while heating to increase the solids temperature from at least about 10° F. above the solids temperature in step (i) and up to about 20° F. greater than the reaction temperature, and wherein a second portion of the volatile components are removed; and(iii) contacting the polymer solids with a stripping gas to remove a third portion of the volatile components to form a polymer solids stream containing less than 100 ppm by weight (ppmw) of volatile components.2. The method of claim 1 , wherein the ethylene polymerization reactor is a gas phase reactor claim 1 , and wherein:a volatile content of the ethylene polymer effluent stream is from about 5 to about 25 wt. % volatile components;the pressure in step (i) is reduced to a range from about 2 to about 10 psig;the polymer solids contain from about 0.5 to about 5 wt. % volatile components in step (i) after the first portion of volatile components is removed;the solids temperature in step (i) is from about 10° F. to about 20° F. less than the reaction temperature; andthe solids temperature in step (ii) is from at least about 15° F. above the ...

A METHOD OF RECOVERING OLEFINS IN A SOLUTION POLYMERISATION PROCESS

The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first bottom stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; characterised in that at least a part of the second overhead stream is withdrawn as a purge stream. 1. A process for removing hydrocarbons comprising the steps of:(A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapour phase coexist;(B) withdrawing a vapour stream and a concentrated solution stream from the separator;(C) passing at least a part of the vapour stream into a first fractionator;(D) withdrawing a first overhead stream and a first bottom stream from the first fractionator;(E) passing the first bottom stream to a second fractionator;(F) withdrawing a second overhead stream and a second bottom stream from the second fractionator;characterised in that at least a part of the second overhead stream is withdrawn as a purge stream.2. The process according to wherein the stream of the solution comprises 1-octene and n-hexane and a mixture of isomers of 1-octene and n-octane.3. The process according to comprising a step of purging isomers of 1-octene and n-octane with the purge stream.4. The process according to comprising the additional step of:(G) passing optionally at least a part of the second overhead stream to a polymerisation reactor.5. The process according to comprising the additional step of:(H) passing the first overhead stream to a third fractionator;(I) withdrawing a third ...

POLYMERISATION PROCESS AND POLYMERISATION UNIT COMPRISING A DEGASSING SECTION

The present invention relates to processes and apparatus useful for the production of polymer powder, and in particular to processes and apparatus for the degassing of polymer powder. 111-. (canceled)12. Polymerisation unit for producing polymer powder comprising light (co)monomer(s), being (co)monomer(s) having less than 7 carbon atoms; and', 'heavy comonomer(s), being comonomers having at least 7 carbon atoms,, 'at least one polymerisation reactor for the polymerisation of'} [{'b': '1', 'light (co)monomer(s) are degassed in the first degassing vessel (V) and recovered,'}, {'b': '2', 'heavy comonomers are degassed in the second degassing vessel (V) and recovered,'}, {'b': '3', 'the active polymer powder is optionally polished and/or optionally deactivated in the optional third degassing vessel (V), and'}], 'and a degassing section comprising two (and optionally a third) cylindrical degassing vessels in series, wherein'}{'b': 2', '1', '2', '1, 'wherein the cross-sectional area (S) of the second degassing vessel is greater than 1.5 times the cross-sectional area (S) of the first degassing vessel [S>1.5×S].'}13. Polymerisation process in a polymerisation unit for producing polymer powder comprising light (co)monomer(s), being (co)monomer(s) having less than 7 carbon atoms; and', 'heavy comonomer(s), being comonomers having at least 7 carbon atoms,, 'at least one polymerisation reactor for the polymerisation of'}{'b': 1', '2', '3, 'and a degassing section comprising two (and optionally a third) cylindrical degassing vessels in series V V V,'} polymerisation of light (co)monomer(s) in the absence of heavy comonomer(s), and of', 'polymerisation of heavy comonomer(s), and, 'wherein the process comprises alternate sequences of'}wherein{'b': '1', 'light (co)monomer(s) are degassed in the first degassing vessel V by passing a counter current purging gas in the said vessel and recovered,'}{'b': '2', 'heavy comonomer(s) are degassed in the second degassing vessel V by passing ...

Systems and Methods for Polyethylene Recovery with Low Volatile Content

The present invention discloses methods for removing volatile components from an ethylene polymer effluent stream from a polymerization reactor, and related polyethylene recovery and volatile removal systems. In these methods and systems, the polymer solids temperature is increased significantly prior to introduction of the polymer solids into a purge column for the final stripping of volatile components from the polymer solids. 120-. (canceled)21. A method for removing volatile components from an ethylene polymer effluent stream from an ethylene polymerization reactor , the method comprising: the pressure is reduced to a range from about 2 to about 200 psig, and', 'the polymer solids have a solids temperature from about 10° F. to about 50° F. less than a reaction temperature in the ethylene polymerization reactor;, '(i) reducing a pressure of the effluent stream to remove a first portion of the volatile components from polymer solids, wherein(ii) fluidizing the polymer solids while heating to increase the solids temperature from at least about 10° F. above the solids temperature in step (i) and up to about 20° F. greater than the reaction temperature, and wherein a second portion of the volatile components are removed; and(iii) contacting the polymer solids with a stripping gas to remove a third portion of the volatile components to form a polymer solids stream containing less than 40 ppm by weight (ppmw) of volatile components.22. The method of claim 21 , wherein:the polymer solids are fluidized in step (ii) with a fluidizing gas having a temperature from about 10° F. less than to about 20° F. greater than the reaction temperature;the fluidizing gas further comprises a catalyst deactivating agent; andthe stripping gas comprises nitrogen, ethylene, fuel gas, propane, ethane, or any combination thereof.23. The method of claim 21 , wherein the ethylene polymerization reactor is a gas phase reactor claim 21 , and wherein:a volatile content of the ethylene polymer ...

Process for preparation of syndiotactic vinyl aromatic polymers

A process for preparing syndiotactic vinyl aromatic polymers comprising contacting one or more aromatic monomers under polymerization conditions with a catalyst corresponding to the formula: [Cp.sub.m MX.sub.n X'.sub.p ].sup.+ A.sup.- wherein: Cp is a single η 5 -cyclopentadienyl or η 5 -substituted cyclopentadienyl group; M is a metal of Group 3, 4, 5, 6, 8, 9, 10 or the Lanthanide Series of the Periodic Table; X each occurrence is an inert anionic ligand, with the proviso that at least one X is R; X' is an inert, neutral, donor ligand; R is hydride hydrocarbyl, silyl, a combination thereof or a substituted derivative thereof having up to 20 carbon, silicon or carbon and silicon atoms; m and p are independently 0 or 1; n is an integer greater than or equal to 1; the sum of m and n is equal to the valence of M; and A - is a noncoordinating, compatible anion of a Bronsted acid salt.

Catalyst composition for preparation of syndiotactic vinyl aromatic polymers

A catalyst composition for preparation of polymers of vinyl aromatic monomers having high syndiotacticity comprising a cationic coordination complex and a metal hydrocarbyl.

Polymer powder storage and/or transport and/or degassing vessels

Polymer powder vessel having a silo including a main vertical cylinder and a hopper at the bottom of the cylinder, a polymer powder which occupies the full volume of the hopper and at least a part of the volume of the cylinder, a polymer powder silo inlet pipe connected to the silo at a height located above the polymer powder, and a polymer hopper withdrawal pipe is also connected to the hopper. The polymer powder hopper withdrawal pipe is also connected to the silo at a location above the polymer powder for recirculating a part of the polymer powder within the silo.

Diluent and inert gas recovery from a polymerization process

A polymerization process wherein a slurry of polymer and diluent is passed from the polymerization zone to a flash zone, then polymer solids having residual diluent carried thereon are passed to a purge zone wherein a heated noncombustible gas is used to remove additional amounts of diluent, and then the vapor purge zone is condensed and cooled to produce a vapor stream comprising said noncombustible gas and a liquid stream comprising diluent.

Polymerization using a stripping agent for devolatilization

This disclosure describes processes for producing polymer using non-polar and condensable stripping agents to remove volatile components, such as solvent and unreacted monomer, from the produced polymer. Systems for performing these processes are also disclosed.

Container for storing and(or) moving and(or) degassing powdered polymer

FIELD: chemistry. SUBSTANCE: invention relates to a container for storing or moving or degassing a powdered polymer. The powdered polymer container includes a bin, having a main vertical cylinder and a hopper in the lower part of the cylinder, such that the powdered polymer occupies the entire volume of the hopper and part of the volume of the cylinder, a powdered polymer inlet pipe of the bin, which is connected to the bin at a level higher than the powdered polymer, in the upper part of the bin, and a powdered polymer outlet pipe of the hopper connected to the hopper in its lower part. The powdered polymer outlet pipe of the hopper is also connected to the bin at a point higher than the powdered polymer for recuperating part of the powdered polymer into the bin. EFFECT: invention provides easy operation of the container. 16 cl, 2 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (51) МПК B01J 8/00 (11) (13) 2 545 275 C2 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2012134511/05, 24.12.2010 (24) Дата начала отсчета срока действия патента: 24.12.2010 (72) Автор(ы): Жан-Луи ШАМАЙУ (FR), Кевин Питер РАМСЕЙ (GB) 13.01.2010 EP 10150650.9 (43) Дата публикации заявки: 20.02.2014 Бюл. № 5 R U (73) Патентообладатель(и): ИНЕОС КОММЕРШИАЛ СЕРВИСИЗ ЮК ЛИМИТЕД (GB) Приоритет(ы): (30) Конвенционный приоритет: (45) Опубликовано: 27.03.2015 Бюл. № 9 A, 18.11.1997. RU 2141373 C1, 20.11.1999. RU 2031906 C1, 27.03.1995. EA 7457 B1, 27.10.2006. US 5478922 A, 27.02.2004 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 13.08.2012 2 5 4 5 2 7 5 (56) Список документов, цитированных в отчете о поиске: US 5292863 A, 08.03.1994. US 5688910 2 5 4 5 2 7 5 R U EP 2010/070727 (24.12.2010) C 2 C 2 (86) Заявка PCT: (87) Публикация заявки PCT: WO 2011/085937 (21.07.2011) Адрес для переписки: 105082, Москва, Спартаковский пер., д. 2, стр. 1, секция 1, этаж 3, "ЕВРОМАРКПАТ" (54) ЕМКОСТЬ ДЛЯ ХРАНЕНИЯ И (ИЛИ ) ПЕРЕМЕЩЕНИЯ И (ИЛИ) ...

Process for preparation of syndiotactic polystyrene

Syndiotactic polymers of vinyl aromatic monomers are prepared by conducting the polymerization in the presence of a catalytic amount of the reaction product of polymethylaluminoxane and a cyclopentadienyl/titanium complex.

PROCEDURE FOR THE PREPARATION OF CRYSTALLINE VINYLAROMATIC POLYMERS WITH PREDOMINANTLY SYNDIOTACTIC STRUCTURE

Systems and methods using an insert assembly with stacked gas flow gaps

Disclosed are insert assemblies with stacked gas flow gaps to add and/or remove gases from a solid/gas mixture travelling through a barrier. An example system may comprise a barrier and an insert assembly in the barrier defining an annulus between the insert assembly and the barrier, wherein the insert assembly comprises stacked flow gaps configured for addition and/or removal of gas from a solid/gas mixture flowing in the annulus.

Continuous process for removing residual monomers or an aqueous polymer latex synthetic and device for its implementation.

On traite le latex par passage dans un échangeur de chaleur constitué pa une enceinte 1 fermée divisée en deux parties distinctes superposées, la partie supérieure 3 dégagée étant mise en dépression et étant en relation avec une installation de récupération du ou des monomères résiduels et la partie inférieure 4 étant équipée d'un cloisonnement 9 délimitant deux circuits 10 et 11 séparés, allongées et contigus, un des circuits 10 étant parcouru par le latex à traiter et étant maintenu en relation, par sa partie supréeirue et sur tout son parcours, avec la partie supérieure 3 de l'enceinte et l'autre circuit 11, isolé de la partie supérieure 3 de l'enceinte, étant parcouru par un fluide caloporteur maintenu à une température de 40 à 100 degres C. De préférence, les deux circuits 10 et 11 sont délimités par un cloisonnement 9 disposé sous la forme d'une double spirale. The latex is treated by passing it through a heat exchanger constituted by a closed enclosure 1 divided into two separate superimposed parts, the cleared upper part 3 being placed under vacuum and being in relation to an installation for recovery of the residual monomer (s) and the part lower 4 being equipped with a partition 9 delimiting two separate circuits 10 and 11, elongated and contiguous, one of the circuits 10 being traversed by the latex to be treated and being maintained in relation, by its supréirue part and throughout its course, with the upper part 3 of the enclosure and the other circuit 11, isolated from the upper part 3 of the enclosure, being traversed by a heat transfer fluid maintained at a temperature of 40 to 100 degrees C. Preferably, the two circuits 10 and 11 are delimited by a partition 9 arranged in the form of a double spiral.

Spiral heat exchanger as a preheater in polymer devolatilization processes

This invention relates to a process for forming polymer including: polymerizing a monomer dissolved in a solvent in the presence of a catalyst system under conditions to obtain a first effluent stream including a solution of the polymer and the solvent; heating the first effluent stream in at least one spiral heat exchanger to produce a second effluent stream, where the first effluent stream flows through the spiral heat exchanger in a cross-flow direction relative to spirals of the spiral heat exchanger and performing a separation on the second effluent stream to produce: a third effluent stream including polymer substantially free of the solvent; and a recycle stream including the solvent and unreacted monomer. Processes for devolatilizing a polymer stream are also provided herein.

Polymer powder storage and/or transport and/or degassing vessels

The present invention relates to a polymer powder vessel, preferably a polymer powder storage and/or transport and/or degassing vessel.

Polymer powder storage and/or transport and/or degassing vessels

The present invention relates to a polymer powder vessel, preferably a polymer powder storage and/or transport and/or degassing vessel.

Removal of unreacted monomers and other materials from polyolefin product particles

A method for the removal of unreacted olefin monomer(s) from polyolefin product particles of an olefin polymerization reaction, the method including: contacting the polyolefin product particles with a countercurrent flow of a purge gas in a purge vessel under conditions allowing diffusion of unreacted monomer and other gaseous substances from the polyolefin product particles into the countercurrent flow of the purge gas to produce purged particles; wherein the velocity of the purge gas exceeds 50% of the calculated minimum fluidization velocity of the polyolefin product particles in the purge vessel (U mf ), is provided.

Monomer recovery by returning column overhead liquid to the reactor

A polyolefin production system, comprising a polymerization reactor (such as a polyethylene loop slurry reactor) and a fractionation system that receives reactor effluent processed in a diluent/monomer recovery system for recycle to the reactor and to suppliers. A conduit diverts a portion of a reflux flow comprising monomer, such as ethylene, from within the fractionation system to the polymerization reactor, providing for less venting of monomer, such as ethylene, to the supplier. Accordingly, monomer yield is advantageously increased, as the monomer returned to the reactor displaces monomer feedstock to the reactor. The reflux flow may originate from a condensed overhead lights from a diluent recycle column disposed in the fractionation subsystem. The diluent recycle column may receive a stream comprising diluent and monomer as feed from the diluent/monomer recovery subsystem, and may receive the non-diverted portion of the reflux flow as reflux.

Polymer stream transfer

A process for heating a polymer-containing stream being transferred from a polymerization reactor to a separation zone or device is described, comprising passing the stream through a heater comprising at least one transfer line for the stream and means for heating the transfer line, wherein the average particle size of the solid polymer is less than 3mm, the mass flowrate of the polymer-containing stream exiting the heater is no more than 15% greater than the mass flowrate exiting the reactor, and the average velocity of the polymer-containing stream at 80% along the length of the heated part of the transfer line measured from the transfer line inlet is at least 6 m/s, preferably at least 8m/s and more preferably at least 10m/s.

A process for the reduction of the residual monomer content of water-absorbent foam

A process for the reduction of the residual monomer content and enhancement of the wet strength of articles formed from water absorbent crosslinked polymer foams containing units derived from monoethylenically unsaturated acids, which comprises treating the formed articles with at least 0.5% by weight of a polymer containing primary and/or secondary amino groups and having a molar mass of at least 300, the formed foam articles thus obtainable and use of the wet strength enhanced formed foam articles in hygiene articles.

Process for producing a styrene polymer and a catalyst for use therein

There are disclosed a process for producing a styrene polymer having a high degree of syndiotactic configuration at a reduced cost and an enhanced efficiency, and a catalyst to be used therefor which comprises a specific transition-metal compound (A) and a specific coordination complex compound (B) instead of alumioxane. The catalyst according to the present invention is inexpensive compared with the conventional catalyst containing aluminoxane as the major ingredient, and exhibits a high activity in polymerization a styrenic monomer into styrene polymer with a high degree of syndiotacticity as well as a high yield and conversion rate.

Process for producing amorphous syndiotactic polystyrene

High molecular weight syndiotactic polystyrene having greater than 96% syndiotacticity can be produced in very high yield (greater than 92%) by polymerizing styrene monomer, under rigorously anhydrous conditions, with a catalyst comprising Cp*M(CH 3 ) 3 , where Cp* is a single η 5 -cyclopentadienyl or an η 5 -cyclopentadienyl group optionally covalently bonded to M through a substituent, and M is selected from Ti, Zr, Hf and a co-catalyst comprising B(C 6 F 5 ) 3 dissolved in an aromatic solvent such as toluene or styrene, at carefully controlled temperatures in the range -15° C. to +50° C. The rapid rate of polymerization and high yield make the production of hard, rigid products by reaction injection moulding possible.

Purification of plasticizer and use thereof in a polymer production process and plant

The invention relates to purification of plasticizer, particularly for use in a polymer production process and plant. More particularly, the invention relates to purification of plasticizer, such as by gas stripping, for use in a process for in-line blending of polymer and plasticizer.

Devolatilization processes

In at least one embodiment, a process of forming a polymer includes supplying a feed having one or more olefin monomers and a solvent; contacting the feed with a catalyst to form a reaction mixture; treating the reaction mixture in a first separator to form a first polymer-rich mixture; introducing the first polymer-rich mixture into a second separator; introducing a volatile component and/or inert component into the first separator, the second separator and/or a line between the first separator and the second separator; treating the first polymer-rich mixture to form a second polymer-rich mixture; and devolatilizing the second polymer-rich mixture to obtain the polymer.

Catalyst composition for preparation of syndiotactic vinyl aromatic polymers

A catalyst composition for preparation of polymers of vinyl aromatic monomers having high syndiotacticity comprises (1) a cationic metal complex of the formula         [Cp m MX n X′ p ]⁺A⁻ wherein:    Cp is a single η⁵-cyclopentadienyl group or a η⁵-substituted cyclopentadienyl group;    M is a metal of Group 4 of the Periodic Table;    each X independently is an inert anionic ligand or a group of formula R, with the proviso that at least one X is R;    X′ is an inert, neutral donor ligand;    each R independently is R′ or hydride, wherein R′ is hydrocarbyl, silyl or a mixture thereof, optionally substituted with one or more halogen atoms or alkoxy groups, and having up to 20 carbon and/or silicon atoms;    m and p are independently 0 or 1;    n is an integer greater than or equal to 1; and    the sum of m and n is one less than the valence of M; and    A⁻ is a noncoordinating, compatible anion; and (2) an aluminum, magnesium or zinc metal hydrocarbyl in a metal complex : metal hydrocarbyl ratio of 1:1 to 1:1000; said components (1) and (2) being combined prior to contact with a vinyl aromatic monomer.

Process for producing a styrene polymer having high degree of syndiotactic configuration

There are disclosed a process for producing a styrene polymer having a high degree of syndiotactic configuration at a reduced cost and an enhanced efficiency, and a catalyst to be used therefor which comprises (A) a specific transition-metal compound, (B) a specific coordination complex compound and (C) a compound having an alkyl group. The catalyst according to the present invention is inexpensive compared with the conventional catalyst containing aluminoxane as the major ingredient, and exhibits a high activity in polymerizing a styrenic monomer into styrene polymer with a high degree of syndiotacticity as well as a high yield and conversion rate.

Process for producing a styrene polymer and a catalyst for use therein

There are disclosed a process for producing a styrene polymer having a high degree of syndiotactic configuration at a reduced cost and an enhanced efficiency, and a catalyst to be used therefor which comprises (A) a specific transition-metal compound, (B) a specific coordination complex compound and (C) a compound having an alkyl group. The catalyst according to the present invention is inexpensive compared with the conventional catalyst containing aluminoxane as the major ingredient, and exhibits a high activity in polymerizing a styrenic monomer into styrene polymer with a high degree of syndiotacticity as well as a high yield and conversion rate.

Process for producing syndiotactic polymer of aromatic vinyl compounds

A catalyst for polymerizing an aromatic vinyl compound, comprising a transition metal compound as a catalyst component (A) represented by the general formula ##STR1## where M is an element of Group IVb of the Periodic Table of Elements; X 1 and X 2 are respectively halogen; R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are respectively hydrogen or an alkyl group of from 1 to 6 carbons; and m is an integer of 1 to 6; and an aluminoxane as a catalyst component (B) represented by the general formula (2) or (3): ##STR2## where n is an integer of from 4 to 60; and R 7 is an alkyl of from 1 to 6 carbons, phenyl or benzyl, preferably methyl, and a process for producing a polymer of an aromatic vinyl compound, comprising polymerizing the aromatic vinyl compound in the presence of the catalyst.

Process for producing styrene polymers

Disclosed is a process for producing a styrene polymer having a syndiotactic configuration and a wide molecular weight distribution, which is characterized by using as catalyst (a) two or more kinds of titanium compounds and (b) alkylaluminoxane, in the polymerization of styrene monomers. According to the process of the present invention, a styrene polymer which is excellent in physical properties such as heat resistance because of a high syndiotacticity, and also has a wide molecular weight distribution can be obtained. These styrene polymers can be suitably used as materials for various moldings including hollow molding, sheet molding, and film molding.

Catalyst for producing aromatic vinyl compound-based polymer composition and process for producing aromatic vinyl compound-based polymer composition using same

There are disclosed a catalyst for producing an aromatic vinyl compound-based polymer composition which catalyst comprises (A) at least two different transition metal compounds each having one π-ligand and (B) an ionic compound comprising a noncoordinate anion and a cation and/or an aluminoxane, and (C) a Lewis acid to be used as the case may be; and a process for producing an aromatic vinyl compound-based polymer composition having a high degree of syndiotactic configuration in its aromatic vinyl chains which process comprises polymerizing an (a) aromatic vinyl compound and (b) an olefinic compound and/or a diolefinic compound in the presence of the above catalyst. The catalyst according to the present invention, which has a high activity, can afford an resin composition comprising an aromatic vinyl compound-based polymer having a syndiotactic configuration and a rubbery elastomer, each being uniformly mixed therein, and thus the resin composition can efficiently be produced by the use of the above catalyst.

Catalyst and process for preparation of syndiotactic polystyrene

Syndiotactic polymers of vinyl aromatic monomers are prepared by conducting the polymerization in the presence of a catalytic amount of the reaction product of polymethylaluminoxane and a cyclopentadienyl/titanium complex.

Method for producing styrene polymer and its catalyst

Method for producing styrenic polymer and catalyst thereof

Process for preparation of syndiotactic vinyl aromatic polymers using reduced metal catalyst

A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a catalyst comprising a Group 4 metal complex in the +3 oxidation state and a polyalkylaluminoxane cocatalyst.

Process for preparation of syndiotactic vinyl aromatic polymers using reduced metal cationic catalyst

A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a catalyst comprising a cationic Group 4 metal complex wherein the metal is in the +3 oxidation state formed from the corresponding metal hydrocarbyloxy containing complex in the presence of a hydrocarbylation agent.

Process for preparation of syndiotactic vinylidene aromatic polymers using chain transfer agent

A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with tri n-propyl aluminum chain transfer agent under Ziegler-Natta polymerization conditions.

Process for producing a styrenic polymer

There are disclosed a catalyst which comprises (A) a titanium compound having one π electron-based ligand (e.g. pentamethylcyclopentadienyl group) or two same π electron-based lignads and (B) an ionic compound comprising a non-coordinate anion and a cation of an element typifying the group 4 elements of the Periodic Table (e.g. triphenylcarbonium tetra(pentafluorophenyl)borate; a catalyst comprising (C) an alkylating agent (e.g. triisobutylaluminum) in addition to the components (A) and (B); and a process for producing a styrenic polymer by the use of any of the aforesaid catalysts. By using the aforementioned catalyst and process, a highly syndiotactic styrenic polymer can be efficiently produced.

Process for producing styrenic polymer

There is disclosed a process for producing a syndiotactic polystyrene (SPS) which comprises polymerizing a styrenic monomer having a content of indene-based compounds of at most 50 ppm by bringing a polymerization catalyst into contact with the above styrenic monomer, which catalyst preferably comprises an (A) transition metal compound (e.g. Ti compound) and (B) an (a) compound capable of reacting with the above transition metal compound (component (A)) to form an ionic complex (e.g. DMAB) or a (b) oxygen atom-containing compound (e.g. MAO), and optionally a (C) alkyl group-containing metallic compound (e.g. TIBA). By virtue of using the above styrenic monomer, the process enables to minimize the amount of the residual metals in the resultant styrenic polymer without deterioration of the catalytic activity, simplify the process and thereby curtail the production cost of SPS.

Method of producing articles from syndiotactic vinyl aromatic polymers

The present invention relates to a process of producing a molded article from a composition comprising a syndiotactic vinyl aromatic polymer, wherein the molded article has a residual vinyl aromatic monomer content of less than 0.05 per 100 parts syndiotactic vinyl aromatic polymer comprising molding a composition of a syndiotactic vinyl aromatic polymer having a residual vinyl aromatic monomer content of less than 0.3 parts per 100 parts syndiotactic vinyl aromatic polymer, at a temperature of from 265° C. to 305° C. to produce a molded article; and heat treating the molded article at a temperature of 210° C. to 230° C. for at least 2 minutes to thermally initiate free radical polymerization of the residual monomer.

Polymerization of vinyl aromatic monomers using cyclopentadienyl zirconium catalysts

Polymers of vinyl aromatic monomers having a high degree of syndiotacticity are prepared by contacting with a catalyst comprising a cyclopentadienyl zirconium (IV) complex and polymethylaluminoxane under polymerization conditions.

Process for producing a styrenic polymer

There are disclosed a catalyst which comprises (A) a titanium compound having one π electron-based ligand (e.g. pentamethylcyclopentadienyl group) or two same π electron-based lignads and (B) an ionic compound comprising a non-coordinate anion and a cation of an element typifying the group 4 elements of the Periodic Table (e.g. triphenylcarbonium tetra(pentafluorophenyl)borate; a catalyst comprising (C) an alkylating agent (e.g. triisobutylaluminum) in addition to the components (A) and (B); and a process for producing a styrenic polymer by the use of any of the aforesaid catalysts. By using the aforementioned catalyst and process, a highly syndiotactic styrenic polymer can be efficiently produced.

Process for preparation of syndiotactic vinylidene aromatic polymers using reduced metal cationic catalysts

A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a catalyst comprising a cationic Group 4 metal complex wherein the metal is in the +3 oxidation state formed from the corresponding metal hydrocarbyloxy containing complex in the presence of a hydrocarbylation agent.

Process for preparation of syndiocatic vinylidene aromatic polymers using reduced metal catalysts

A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a catalyst comprising a Group 4 metal complex in the +3 oxidation state and a polyalkylaluminoxane cocatalyst.

Method of producing articles from syndiotactic vinyl aromatic polymers

The present invention relates to a process of producing a molded article from a composition comprising a syndiotactic vinyl aromatic polymer, wherein the molded article has a residual vinyl aromatic monomer content of less than 0.05 per 100 parts syndiotactic vinyl aromatic polymer comprising molding a composition of a syndiotactic vinyl aromatic polymer having a residual vinyl aromatic monomer content of less than 0.3 parts per 100 parts syndiotactic vinyl aromatic polymer, at a temperature of from 265° C. to 305° C. to produce a molded article; and heat treating the molded article at a temperature of 210° C. to 230° C. for at least 2 minutes to thermally initiate free radical polymerization of the residual monomer.

Process for preparation of syndiotactic vinylidene aromatic polymers using chain transfer agent

A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with tri n-propyl aluminum chain transfer agent under Ziegler-Natta polymerization conditions.

Transfer vessel between flash tank and purge column for recovering polymer solids

A process is provided for recovering polymer solids from a polymerisation reactor effluent. The process comprises extracting the polymerisation effluent from a polymerisation reactor; passing the effluent, or a part thereof, to a flash vessel for flashing liquid in the effluent to vapour, and removing said vapour from said flash vessel; passing the polymer solids from the flash vessel to a transfer apparatus which comprises a transfer vessel; passing the polymer solids from the transfer vessel to a purging means for removing residual liquid from the polymer solids; wherein the polymer solids are passed from the flash vessel to the purging means in a continuous flow such that a quantity of polymer solids is maintained in the transfer vessel. An apparatus for performing the process is also provided.

Purification and use of plasticizers in polymer manufacturing processes and plants

Syndiotactic vinylaromatic polymerization process using low hydrogen partial pressures

A process for preparing syndiotactic polymers of vinylaromatic monomers comprising contacting one or more vinylaromatic monomers with a catalyst system comprising a pentamethylcyclopentadienyltitanium based metal complex capable of preparing syndiotactic vinylaromatic polymers under coordination polymerization conditions in the presence of hydrogen gas at a hydrogen partial pressure from 10 to 45 kPa.

Process for production of styrene polymers

A process for production of styrene polymers of high syndiotactic configuration is disclosed, comprising polymerizing styrene or styrene derivatives by the use of a catalyst comprising: (A) a titanium compound, e.g., at least one compound selected from those represented by the formulae: TiR 1 a R 2 b R 3 c X 1 4 -(a+b+c) and TiR 1 d R 2 e X 1 3- (d+e) (all the symbols are as defined in the appended claims); and (B) a contact product of an organoaluminum compound and a condensation agent, e.g., a product resulting from modification of trimethylaluminum with water. Because of such high syndiotactic configuration, the styrene polymers are greater in thermal resistance and solvent resistance than conventional atactic polystyrene.

Catalyst composition for preparation of syndiotactic vinyl aromatic polymers

Catalyst composition for syndiotactic vinyl aromatic polymer production

Catalyst composition for the production of vinyl aromatic syndiotactic polymers

Catalyst and process for preparation of syndiotactic polystyrene

Syndiotactic polymers of vinyl aromatic monomers are prepared by conducting the polymerization in the presence of a catalytic amount of the reaction product of polymethylaluminoxane and a specific monocyclopentadienyl/titanium complex.

Catalyst composition for preparation of syndiotactic vinyl aromatic polymers

Catalyst composition for the production of vinyl aromatic syndiotactic polymers

Catalyst composition for the production of vinyl aromatic syndiotactic polymers

Catalyst and process for preparation of syndiotactic polystyrene

Syndiotactic polymers of vinyl aromatic monomers are prepared by conducting the polymerization in the presence of a catalytic amount of the reaction product of polymethylaluminoxane and a specific monocyclopentadienyl/titanium complex.

Method for producing styrenic polymer

Process for producing styrenic polymer

Process for polymerizing an aromatic vinyl compound and a catalyst therefor

A catalyst for polymerizing an aromatic vinyl compound, having the formula (I): ##STR1## where M is an element of Group IVa; X 1 is a halogen; R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 are independently hydrogen or an alkyl group having 1 to 6 carbon atoms; R 8 is hydrogen or an alkyl group having 1 to 5 carbon atoms; m is an integer of from 1 to 6; and n is an integer of from 4 to 60. The vinyl polymer produced has predominantly a syndiotactic structure.

Method for producing styrenic polymer and catalyst thereof

Process for the polymerization of vinyl aromatic monomers

The invention relates to a process for preparing vinyl aromatic polymers having a high degree of syndiotacticity and a high molecular weight comprising contacting at least one polymerizable vinyl aromatic monomer under polymerization conditions with a catalyst comprising a reduced transition metal complex and a co-catalyst. The invention is characterized in that the transition metal complex consists of a reduced transition metal, chosen from groups 4-6 of the Periodic Table of the Elements, with a multidentate monoanionic ligand and with two monoanionic ligands. In particular, the reduced transition metal is titanium (Ti).

Polyolefin preparation process

This invention relates to a solution polymerization process that allows two different types of polyethylene to be produced at the same time. The different polyethylenes may have substantially different densities.

Preparation of polymers of vinylaromatic compounds under superatmospheric pressure in the presence of volatile hydrocarbons

In a process for preparing polymers of vinylaromatic compounds at from 0 to 150 C. in the presence of metallocene complexes as catalysts, the polymerization is carried out at a pressure of from 5 to 300 bar in the presence of aliphatic C1-C4-hydrocarbons using a coordination complex selected from the group consisting of strong, uncharged Lewis acids, ionic compounds having Lewis acid cations and ionic compounds having Bronsted acids as cations as cocatalyst

Process for (co) polymerizing polar and non-polar monomers

The invention relates to a method for carrying out the transition metal-catalyzed production of polymers having a syndiotactic or predominantly syndiotactic structure from vinyl aromatic monomers. The invention also relates to a method for producing block copolymers from vinyl aromatic monomers and from olefinically unsaturated polar monomers. According to the invention, transition metal compounds of general formula (I) are used in which the substituents and indices have the following meanings: M represents scandium, yttrium, lanthanum or a lanthanoid metal; R''' represents pi -C3 to C20 alkyl; L represents a low-molecular, Lewis-basic organic compound, whereby n1 and n2 = 0 or n1 = 0 and n2 = 1 or n1 = 1 and n2 = 0, and; m represents 1 or 2.

スチレン系重合体の製造方法及びその触媒

增塑剂的纯化及其在聚合物生产方法和装置中的用途

本发明涉及增塑剂的纯化，特别是用于聚合物生产方法和装置的纯化。更具体来说，本发明涉及例如通过气提的增塑剂的纯化，其用于聚合物和增塑剂的在线共混的方法。

Methods for Separating Slurry Components

The invention relates to methods for separating slurry components. In particular, the invention relates to the concentration of polymer particles in a slurry from the polymerization of C 4 -C 7 isoolefins.

Production of impact copolymer polypropylene using metallocene and ziegler-natta catalysts in parallel reactors

The present disclosure provides methods for the production of polymer blends using multiple reactors arranged in parallel. The methods comprise: providing a first feed comprising propylene to a first reactor operated in parallel with a second reactor; catalytically converting the first feed in the first reactor under polymer formation conditions utilizing a first catalyst to form a first product mixture; separating the first product mixture into a first fraction comprising polypropylene and a second fraction comprising unreacted propylene; providing a second feed comprising one or more elastomeric monomers to the second reactor; catalytically converting the second feed in the second reactor under polymer formation conditions utilizing a second catalyst different from the first catalyst to form a second product mixture comprising an elastomeric polymer; and blending the first fraction with the second product mixture downstream from the first reactor and the second reactor to form a polymer blend.

SYSTEM AND METHOD FOR RECOVERING GASEOUS EMISSIONS GENERATED IN THE PRODUCTION OF OLEFIN POLYMERS

La présente description se rapporte à un système destiné à récupérer les émissions générées à partir d'un procédé de polymérisation d'oléfines, comprenant : un dévolatiliseur destiné à recevoir un gaz de balayage frais et les émissions générées à partir du procédé de polymérisation d'oléfines et à sortir un premier fluide et une résine de polyoléfine ; une unité de réfrigération par compression comprenant un dispositif de compression et un premier dispositif d'échange de chaleur, pour recevoir ledit premier fluide et sortir un premier mélange gaz-liquide ; un premier dispositif de séparation de gaz-liquide destiné à séparer le premier mélange gaz-liquide et à sortir un premier produit de récupération et une première composition à phase gazeuse ; un premier dispositif de séparation de gaz destiné à recevoir la première composition à phase gazeuse, à en retirer de petites substances moléculaires et à sortir une composition riche en petits gaz moléculaires et une deuxième composition à phase gazeuse riche en hydrocarbures ; et un deuxième dispositif de séparation de gaz possédant un deuxième dispositif d'échange de chaleur, un deuxième dispositif de séparation de gaz-liquide et un premier dispositif d'expansion de gaz. The present disclosure relates to a system for recovering emissions generated from an olefin polymerization process, comprising: a devolatilizer for receiving a fresh sweep gas and the emissions generated from the polymerization process of olefins and extracting a first fluid and a polyolefin resin; a compression refrigeration unit comprising a compression device and a first heat exchange device for receiving said first fluid and outputting a first gas-liquid mixture; a first gas-liquid separation device for separating the first gas-liquid mixture and outputting a first recovery product and a first gas phase composition; a first gas separation device for receiving the first gas phase composition, removing small molecular ...

System and process for recovering gas emissions generated in producing olefin polymers

The present disclosure provides a system for recovering emissions generated from an olefin polymerization process, comprising: a devolatilizer for receiving a fresh sweep gas and emissions generated from the olefin polymerization process and outputting a first fluid and a polyolefin resin; a compression refrigeration unit including a compression device and a first heat exchange device, for receiving said first fluid and outputting a first gas-liquid mixture; a first gas-liquid separation device for separating the first gas-liquid mixture and outputting a first recovery product and a first gas phase composition; a first gas separation device for receiving the first gas phase composition, removing small molecular substances therefrom, and outputting a composition rich in small molecular gases and a second gas phase composition rich in hydrocarbons; and a second gas separation device having a second heat exchange device, a second gas-liquid separation device, and a first gas expansion device.

Systeem en werkwijze voor het terugwinnen van gasemissies gegenereerd in de productie van olefine polymeren

Deze uitvinding betreft een systeem voor het terugwinnen van emissies gegenereerd in een olefine polymerisatieproces, omvattende: een ontgasser voor emissies gegenereerd in het olefine polymerisatieproces; een compressie koeleenheid met een compressor en een eerste warmtewisselaar, voor het vrijstellen van een eerste gas-vloeistofmengsel; een eerste gas-vloeistofscheidingsinrichting voor het vrijstellen van een eerste terugwinproduct en een eerste gasfasesamenstelling; een eerste gasscheidingsinrichting voor het verwijderen van kleine moleculaire substanties daaruit en het afgeven van een gassamenstelling rijk aan kleine moleculaire gassen en een tweede gasfasesamenstelling rijk aan koolwaterstoffen; een tweede gasscheidingsinrichting met een tweede warmtewisselaar, een tweede gas-vloeistofscheidingsinrichting en een eerste gasexpansie inrichting.

Methods for separaring slurry components

The invention relates to methods for separating slurry components. In particular, the invention relates to the concentration of polymer particles in a slurry from the polymerization of C4-C7 isoolefins.

Removal of unreacted monomers and other materials from polyolefin product particles

A method for the removal of unreacted olefin monomer(s) from polyolefin product particles of an olefin polymerization reaction, the method including: contacting the polyolefin product particles with a countercurrent flow of a purge gas in a purge vessel under conditions allowing diffusion of unreacted monomer and other gaseous substances from the polyolefin product particles into the countercurrent flow of the purge gas to produce purged particles; wherein the velocity of the purge gas exceeds 50% of the calculated minimum fluidization velocity of the polyolefin product particles in the purge vessel (Umf), is provided.

Process and apparatus for the devolatilization of polymer solutions

Purification of plasticizer and use thereof in a polymer production process and plant

Monomer removal from vinyl chloride resin slurry by steaming and apparatus therefor

Method for controlling the molecular weight distribution in a polymerization process

Processo para preparação de uma dispersão aquosa de polímero

芳香族ビニル化合物重合用触媒および芳香族ビニル化合物重合体の製造方法

Fremgangsmaate til gjenvinning av fortynningsmiddel og inert gass fra en polymerisasjonsprosess

PROCEDURE FOR THE REDUCTION OF RESIDUAL MONOMERS IN LIQUID SYSTEMS WITH ADDITION OF A REDOX INITIATOR SYSTEM

La presente se refiere a un procedimiento para la reduccion efectiva del contenido de monomeros residuales en una solucion, mezcla, masa, fundida,suspension o dispersion líquida de un polímero por polimerizacion posterior con adicion de un sistema deiniciadores redox a una temperatura de reaccionapropiada y a un tiempo de mezcla en lo posible pequeno del sistema líquido en el reactor de produccion, en donde por lo menos uno de los componentesiniciadores redox requeridos para la polimerizacion de los monomeros residuales se agrega paulatinamente, de a porciones o en forma continua durante un tiempoaproximadamente 10 a 250 veces mayor que el tiempo de mezcla del sistema líquido en el reactor. This refers to a process for the effective reduction of the content of residual monomers in a solution, mixture, mass, melt, suspension or liquid dispersion of a polymer by subsequent polymerization with the addition of a redox initiator system at an appropriate reaction temperature and a mixing time as small as possible of the liquid system in the production reactor, where at least one of the redox initiating components required for the polymerization of the residual monomers is added gradually, portionwise or continuously for approximately 10 to 250 times longer than the mixing time of the liquid system in the reactor.

PROCEDURE FOR THE PREPARATION OF CRYSTALLINE VINYLAROMATIC POLYMERS WITH PREDOMINANTLY SYNDIOTACTIC STRUCTURE

Method and apparatus for separation of polymer from a slurry

Provided for separating polymer from a slurry comprising polymer and unreacted carrier fluid is (a) a method comprising supplying slurry to a first heating means to increase the temperature of the slurry, using a first separator means to extract a portion of unreacted carrier fluid from the slurry to obtain a slurry enriched in polymer, supplying the enriched slurry to a second heating means to increase the temperature of the enriched slurry, and using a second separator means to extract an additional portion of unreacted carrier fluid from the enriched slurry to obtain a further enriched slurry, and (b) an apparatus comprising a first heating means, a first separator means, a second heating means and a second separator means.

使聚合物粉末脱气的方法

本发明提供生产脱气聚合物粉末的方法，该方法包括：a)将以下原料进料至聚合反应器中：i)主要单体，和ii)以相对于主要单体进料率至少5000ppmw的量进料的一种或多种共聚单体，和iii)以相对于主要单体进料速率至少1000ppmw的量进料的任选的一种或多种具有2至10个碳原子的添加的烷烃；在聚合反应器中单体和共聚单体反应以形成包括残余烃的聚合物，所述残余烃包括一种或多种具有3至10个碳原子的烃，和b)使聚合物经过脱气步骤，在其中该聚合物与吹扫气体接触，以去除至少一些残余烃，其特征在于：1)脱气步骤中的G/P比率高于最小G/P比率，G为脱气步骤中的吹扫气体质量流速，P为脱气步骤的聚合物通过量，和2)吹扫气体具有低于吹扫气体中的所述关键性烃组分的最大浓度的关键性烃组分浓度，该关键性烃组分为选自步骤(a)中进料的(i)、(ii)和(iii)的最重烃组分，基于要脱气的聚合物粉末的吸收系数Kh，已经计算出最小G/P比率和吹扫气体中的所述关键性烃组分的最大浓度。