Patent ID: 8128733
Filing Date: 2012-03-06
Classification: B01D,Y02C,Y02E,Y10S

Abstract:
1. A process to increase an Equivalent Methane Concentration (EMC) of a gas stream, comprising: (a) providing a membrane having a feed side and a permeate side, and being selectively permeable to carbon dioxide over methane and to oxygen over nitrogen; (b) passing a raw gas stream comprising methane and carbon dioxide, and having a first EMC, across the feed side; (c) passing an oxygen-containing stream across the permeate side; (d) withdrawing from the feed side a residue stream having a second EMC that is higher than the first EMC; (e) withdrawing from the permeate side a permeate stream that is enriched in carbon dioxide compared with the oxygen-containing stream.