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 3/02 (2006.01) F25J 3/06 (2006.01)

Patent

CA 2735920

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 (1); 2) cooling the feed gas stream to a 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 gas/liquid separator (4); and 4) subjecting the methane enriched gaseous phase obtained in step 3) to a distillation treatment in a distillation section (10) thereby obtaining a bottom stream (12) rich in liquid phase con-taminant and lean in methane, and a top stream (11) rich in methane and lean in gaseous contaminant. The invention further con-cerns a device for carrying out the present process, the purified gas stream, and a process for liquefying a feed gas stream.

La présente 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 le flux de gaz d'alimentation (1); 2) à refroidir le flux de gaz d'alimentation à une température à laquelle le 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) à l'aide d'un séparateur gaz/liquide (4); et 4) à soumettre la phase gazeuse enrichie en méthane obtenue à l'étape 3) à un traitement de distillation dans une section de distillation (10) de manière à obtenir un effluent de fond (12) riche en contaminant en phase liquide et pauvre en méthane, et un effluent de tête (11) riche en méthane et pauvre en contaminant gazeux. La présente invention concerne un dispositif permettant de mettre en oeuvre ce procédé, le flux de gaz purifié et un procédé permettant de liquéfier un flux de gaz d'alimentation.

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