CO2/C2h6 separation using solubility selective membrane materials

Scott D. Kelman, Haiqing Lin, Benny D. Freeman

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


CO2 is an impurity which must be removed from natural gas streams in a process commonly known as natural gas conditioning. The effectiveness of membranes to break the carbon dioxide/ethane azeotrope was studied. Membrane technology was successfully implemented in natural gas processing facilities and was effective in separating CO2 from methane. The membrane material selected to break the CO2/ethane azeotrope should have a high CO2/ethane selectivity and high CO2 permeability. Mixed gas permeation experiments were conducted using a gas mixture containing 45.3 mole % CO2 and the balance ethane. The mixed gas results show CO2 strongly plasticizes crosslinked poly(ethylene oxide) films at lower temperatures. Slight plasticization of the film is observed at 283 and 308K. CO2 plasticization decreases the mixed gas CO2/ethane selectivity, relative to pure gas values, because the ethane permeability is enhanced by the plasticization effects of CO2. The mixed gas selectivity increases as temperature decreases. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 10/30/2005-11/4/2005).

Original languageEnglish
Title of host publication05AIChE
Subtitle of host publication2005 AIChE Annual Meeting and Fall Showcase, Conference Proceedings
ISBN (Print)0816909962, 9780816909964
Publication statusPublished - 2005
Externally publishedYes
EventAIChE Annual Meeting 2005 - Cincinnati, United States of America
Duration: 30 Oct 20054 Nov 2005 (Website)


ConferenceAIChE Annual Meeting 2005
Abbreviated titleAIChE 2005
Country/TerritoryUnited States of America
Internet address

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