Process for liquefying a gas, notably a natural gas or air, comprising a medium pressure drain and application

The invention is a process for liquefying a compound A from a mixture comprising at least compound A and at least one compound B. The mixture is available at a pressure P1 with separation of the at least one compounds B and/or of compound A being performed by distillation at a pressure substantially close to pressure P2 in order to produce at least a stream mainly comprising the compound A and at least a stream F4 comprising most of the at least one compound B. The invention has an application of methane and/or helium extraction during liquefaction of a natural gas.

Process and device for liquefying a gaseous mixture such as a natural gas in two steps

The process allows to liquefy a gaseous mixture consisting at least partly of a mixture of hydrocarbons, such as a natural gas, by using a cooling mixture that is obtained, after a first cooling step, in a state referred to as "condensed single-phase" state.

Process and device for liquefying and for processing a natural gas

A fluid consisting at least partly of a mixture of hydrocarbons is liquefied by means of the following stages: the mixture under pressure is cooled so as to condense it at least partly to produce a liquid phase and a gas phase, and bringing into contact of at least a fraction of each of said phases is simultaneously achieved at least partly in a countercurrent flow so as to obtain, by matter transfer, a gas phase enriched in light hydrocarbons and a first liquid phase enriched in heavy hydrocarbons, and the two phases obtained thereby are separated and the gas phase enriched in light hydrocarbons is sent to a second cooling stage in order to obtain a second liquid phase enriched in light hydrocarbons.

Process and apparatus for eliminating at least one acid gas by means of a solvent for the purification of natural gas

The process comprises a cold absorption step 2 for removing acid gas from natural gas using a solvent phase at a pressure P2 which delivers a purified gas 5; a step for depressurizing and separating resultant acidic solvent phase containing hydrocarbons (lines 4, 11), at a pressure P12 which is lower than pressure P2 in a column-heat exchanger 12 which delivers a purified gaseous effluent 13 overhead and a further solvent phase at the bottom (line 17) which is enriched in hydrogen sulphide; and a solvent phase regeneration step carried out in a distillation column 18 at a pressure P18 and no higher than pressure P12. A gas 29 containing essentially hydrogen sulphide which is depleted in hydrocarbons is recovered from column 18 and is a suitable feed for a Claus plant for eliminating H2 S. The regenerated hot solvent phase 20 indirectly exchanges heat with the cold acidic solvent phase from absorber 2 or separator 6. It is then recycled to the absorbent after cooling.

Paraffin isomerisation process using reactive distillation

The invention concerns a process for isomerising a feed containing essentially hydrocarbons, preferably paraffins preferably containing 5 and/or 6 carbon atoms per molecule, in which said feed is treated in a distillation zone comprising an exhausting zone and a rectification zone associated with an isomerisation reaction zone, in the presence of an isomerisation catalyst and a gas stream containing hydrogen, characterized in that the reaction zone is at least partially internal to the distillation zone, and wherein the hydrogen-containing gas is fed by a dedicated gas distributor to the bottom of at least one catalytic bed within the isomerization reaction zone.

Process for liquefying a gas, notably a natural gas or air, comprising a medium pressure drain and application

METHOD AND DEVICE FOR TWO-STEP LIQUEFACTION OF A GAS MIXTURE SUCH AS A NATURAL GAS

Le procédé permet de liquéfier un mélange gazeux formé au moins en partie d'un mélange d'hydrocarbures, tel qu'un gaz naturel, en utilisant un mélange réfrigérant qui se présente à l'issue d'une première étape de réfrigération dans un état dit "monophasique condensé". The method makes it possible to liquefy a gaseous mixture formed at least in part of a mixture of hydrocarbons, such as natural gas, by using a refrigerant mixture which is present at the end of a first stage of refrigeration in a state says "condensed monophasic".

METHOD AND DEVICE FOR LIQUEFACTION AND TREATMENT OF NATURAL GAS

The liquefaction of a fluid formed partially by a mixture of hydrocarbon consists of two steps: (a) The mixture is condensed partially under reduced pressure to produce a liquid and a gas phase. Simultaneously, a fraction of at least of one of the phases is at least brought into contact by countercurrent to obtain by matter transfer a gas phase rich in low molecular weight by hydrocarbon and first phase rich in high molecular weight hydrocarbon (b) The resulting phases are separated and the gas phase rich in low molecular weight hydrocarbon is sent to second step of refrigeration to obtain a second liquid phase rich in low molecular weight hydrocarbon. Also claimed is apparatus for running the above process.

METHOD AND DEVICE FOR REMOVING AT LEAST ONE SOLVENT-ACID GAS FOR THE PURIFICATION OF NATURAL GAS

Two-stage liquefaction process and device for a gaseous mixture, such as a natural gas

Le procédé permet de liquéfier un mélange gazeux formé au moins en partie d' un mélange d'hydrocarbures, tel qu'un gaz naturel, en utilisant un mélange réfrigérant qui se présente à l'issue d'une première étape de réfrigération dans un état dit "monophasique condensé".

Process and apparatus for eliminating at least one acid gas by means of a solvent for the purification of natural gas

THE PROCESS COMPRISES A COLD ABSORPTION STEP (2) FOR REMOVING ACID GAS FROM NATURAL GAS USING A SOLVENT PHASE AT A PRESSURE P2 WHICH DELIVERS A PURIFIED GAS (5); A STEP FOR DEPRESSURIZING AND SEPARATING RESULTANT ACIDIC SOLVENT PHASE CONTAINING HYDROCARBONS (LINES 4, 11), AT A PRESSURE P12 WHICH IS LOWER THAN PRESSURE P2 IN A COLUMN-HEAT EXCHANGER (12) WHICH DELIVERS A PURIFIED GASEOUS EFFLUENT (13) OVERHEAD AND A FURTHER SOLVENT PHASE AT THE BOTTOM (LINE 17) WHICH IS ENRICHED IN HYDROGEN SULPHIDE; AND A SOLVENT PHASE REGENERATION STEP CARRIED OUT IN A DISTILLATION COLUMN (18) AT A PRESSURE P18 AND NO HIGHER THAN PRESSURE P12. A GAS (29) CONTAINING ESSENTIALLY HYDROGEN SULPHIDE WHICH IS DEPLETED IN HYDROCARBONS IS RECOVERED FROM COLUMN (18) AND IS A SUITABLE FEED FOR A CLAUS PLANT FOR ELIMINATING H2S. THE REGENERATED HOT SOLVENT PHASE (20) INDIRECTLY EXCHANGES HEAT WITH THE COLD ACIDIC SOLVENT PHASE FROM ABSORBER (2) OR SEPARATOR (6). IT IS THEN RECYCLED TO THE ABSORBENT AFTER COOLING. FIG. 1

METHOD AND DEVICE FOR LIQUEFACTION AND TREATMENT OF NATURAL GAS

On liquéfie un fluide formé au moins en partie d'un mélange d'hydrocarbures en effectuant les étapes suivantes: - on refroidit le mélange sous pression de façon à le condenser au moins partiellement pour produire une phase liquide et une phase gazeuse et, simultanément on réalise la mise en contact au moins en partie à contre-courant, d'une fraction au moins de chacune desdites phases pour obtenir par transfert de matière une phase gazeuse enrichie en hydrocarbures légers et une première phase liquide enrichie en hydrocarbures lourds, et - on sépare les deux phases ainsi obtenues et on envoie la phase gazeuse enrichie en hydrocarbures légers à une seconde étape de réfrigération pour obtenir une deuxième phase liquide enrichie en hydrocarbures légers. A fluid formed at least in part from a mixture of hydrocarbons is liquefied by carrying out the following steps: the mixture is cooled under pressure so as to condense it at least partially to produce a liquid phase and a gas phase and, simultaneously, it is carries out the contacting, at least in part against the current, of at least a fraction of each of said phases to obtain by transfer of material a gaseous phase enriched in light hydrocarbons and a first liquid phase enriched in heavy hydrocarbons, and the two phases thus obtained are separated and the gas phase enriched in light hydrocarbons is sent to a second refrigeration stage to obtain a second liquid phase enriched in light hydrocarbons.

Gas liquefaction process and method, especially for natural gas or air, comprising average pressure bleed

~ Procédé de liquéfaction d'un composé A à partir d'un mélange comportant au moins ledit composé A et un ou plusieurs composés B, ledit mélange étant disponible à une pression P1, au cours duquel on effectue la séparation du ou desdits composés B et/ou la séparation du composé A par distillation à une pression sensiblement voisine de la pression P2 pour produire au moins un flux F 1 comportant en majorité ledit composé A et au moins un flux F4 comportant la quasi-totalité des composés B. ~ Application pour extraire le méthane et/ou l'hélium lors de la liquéfaction d' un gaz naturel ~ Method for liquefying a compound A from a mixture comprising at least said compound A and one or more compounds B, said mixture being available at a pressure P1, during which the separation of said compound or compounds B is carried out and / or the separation of compound A by distillation at a pressure substantially close to the pressure P2 to produce at least one stream F 1 comprising mainly said compound A and at least one stream F4 comprising almost all of the compounds B. ~ Application for extract methane and / or helium during liquefaction of a natural gas

PROCESS FOR ISOMERIZING PARAFFINS BY REACTIVE DISTILLATION

L'invention concerne un procédé d'isomérisation d'une charge comprenant essentiellement des hydrocarbures, de préférence des paraffines, de façon encore plus préférée en majeure partie des paraffines contenant principalement de 4 à 8, de préférence principalement de 4 à 6, de façon encore plus préférée principalement 5 et/ou 6 atomes de carbone par molécule, tel que l'on traite ladite charge dans une zone de distillation, comportant une zone d'épuisement et une zone de rectification, associée à une zone réactionnelle d'isomérisation et d'un flux gazeux comprenant de l'hydrogène, en présence d'un catalyseur d'isomérisation, la charge de la zone réactionnelle étant prélevée à la hauteur d'un niveau de prélèvement et représentant au moins une partie du liquide coulant dans la zone de rectification, l'effluent de la zone réactionnelle étant au moins en partie réintroduit dans la zone de distillation, de manière à assurer la continuité de la distillation, caractérisé en ce que la zone réactionnelle est au moins en partie interne à la zone de distillation. The invention relates to a process for the isomerization of a feed comprising essentially hydrocarbons, preferably paraffins, even more preferably mainly paraffins containing mainly 4 to 8, preferably mainly 4 to 6, so even more preferred mainly 5 and / or 6 carbon atoms per molecule, such that said feed is treated in a distillation zone, comprising a stripping zone and a rectification zone, associated with an isomerization reaction zone and of a gas stream comprising hydrogen, in the presence of an isomerization catalyst, the charge of the reaction zone being taken at the height of a sampling level and representing at least part of the liquid flowing in the zone rectification, the effluent from the reaction zone being at least partly reintroduced into the distillation zone, so as to ensure the continuity of the distillation, characterized in that the react zone ional is ...

Process for the isomerisation of paraffins by reactive distillation