Patent ID: 8617292

Claim:
A method of obtaining carbon dioxide from a CO 2 -containing gas mixture, said method comprising the steps of: obtaining a CO 2 -containing gas mixture; cooling the gas mixture to a temperature from 5Â° C. to about âˆ’60Â° C.; flowing the cooled gas mixture into a gas separation membrane module made of a polymeric material to produce a carbon dioxide-rich stream and a carbon dioxide-lean stream, wherein the polymeric material has a CO 2 solubility at 35Â° C. and 10 bar pressure of >0.03 [(cm 3 of CO 2 at STP)/(cm 3 of polymeric material)(cmHg)] and a glass transition temperature of >210Â° C.; compressing the carbon dioxide-rich stream; at least partially condensing the compressed carbon dioxide-rich stream through cooling; subjecting the cooled, compressed carbon dioxide-rich stream to cryogenic phase separation to produce a CO 2 rich liquid and a CO 2 lean vapor stream; and combining the CO 2 lean vapor stream with the CO 2 -containing gas mixture.