Patent ID: 7339008

Claim:
A process for selective gas separation of a gas mixture comprising: (A) contacting a composition consisting essentially of said gas mixture, wherein said gas mixture comprises carbon dioxide, with a membrane to provide a carbon dioxide enriched permeate and a carbon dioxide depleted retentate, wherein the membrane comprises (i) an ethylene oxide copolymer (I), or (ii) a polymer material obtained by crosslinking copolymer (I), wherein the copolymer (I) comprises (a) at least 30% by number of —CH 2 CH 2 O— units derived from ethylene oxide, and (b) at least 2% by number of —CHR—CH 2 O— units derived from an oxirane carrying a crosslinkable substituent R and/or of —CHR 1 —CH 2 O— units derived from an oxirane carrying a noncrosslinkable substituent R 1 , (B) applying a pressure on the upstream side of said membrane, such that a selective portion of the gas mixture passes through the membrane, and (C) collecting the carbon dioxide enriched permeate and a carbon dioxide depleted retentate.