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Substituted polyacetylene separation membrane

United States Patent

5,707,423
January 13, 1998
View the Complete Patent at the US Patent & Trademark Office
A separation membrane useful for gas separation, particularly separation of C.sub.2+ hydrocarbons from natural gas. The invention encompasses the membrane itself, methods of making it and processes for using it. The membrane comprises a polymer having repeating units of a hydrocarbon-based, disubstituted polyacetylene, having the general formula: ##STR1## wherein R.sub.1 is chosen from the group consisting of C.sub.1 -C.sub.4 alkyl and phenyl, and wherein R.sub.2 is chosen from the group consisting of hydrogen and phenyl. In the most preferred embodiment, the membrane comprises poly(4-methyl-2-pentyne) [PMP]. The membrane exhibits good chemical resistance and has super-glassy properties with regard to separating certain large, condensable permeant species from smaller, less-condensable permeant species. The membranes may also be useful in other fluid separations.
Pinnau; Ingo (Palo Alto, CA), Morisato; Atsushi (Tokyo, JP)
Membrane Technology and Research, Inc. (Menlo Park, CA)
08/ 663,906
June 14, 1996
This invention was made with Government support under Contract Number DE-FG03-94ER81811, awarded by the Department of Energy. The Government has certain rights in this invention.