Process for removing gaseous contaminants from a feed gas...

B - Operations – Transporting – 01 – D

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B01D 53/00 (2006.01) C10L 3/10 (2006.01) F25J 3/06 (2006.01) F25J 3/08 (2006.01)

Patent

CA 2735919

The invention provides a process for removing gaseous contaminants from a feed gas stream which comprises methane and gaseous contaminants, the process comprising: 1) providing the feed gas stream; 2) cooling the feed gas stream to a first temperature at which liquid phase contaminant is formed as well as a methane enriched gaseous phase; 3) separating the two phases obtained in step 2) by means of a first gas/liquid separator; 4) cooling the methane enriched gaseous phase obtained in step 3) at least party by means of an external refrigerant to a second temperature at which liquid phase contaminant is formed as well as a methane enriched gaseous phase; and 5) separating the two phases obtained in step 4) by means of a second gas/liquid separator. The invention further concerns a device for carrying out the present process, the purified gas stream, and a process for liquefying a feed gas stream.

L'invention concerne un procédé permettant d'éliminer des contaminants gazeux d'un flux de gaz d'alimentation comprenant du méthane et des contaminants gazeux. Le procédé consiste 1) à utiliser un flux de gaz d'alimentation; 2) à refroidir le flux de gaz d'alimentation à une première température à laquelle un contaminant en phase liquide est formé ainsi qu'une phase gazeuse enrichie en méthane; 3) à séparer les deux phases obtenues à l'étape 2) au moyen d'un premier séparateur gaz/liquide; 4) à refroidir la phase gazeuse enrichie en méthane obtenue à l'étape 3) au moins en partie à l'aide d'un réfrigérant à une seconde température à laquelle le contaminant en phase liquide est formé ainsi qu'une phase gazeuse enrichie en méthane et 5) à séparer les deux phases obtenues à l'étape 4) à l'aide d'un second séparateur gaz/liquide. La présente invention concerne un dispositif permettant de mettre en oeuvre le procédé susmentionné, le flux de gaz purifié, ainsi qu'un procédé permettant de liquéfier un flux de gaz d'alimentation.

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