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Polymide gas separation membranes

United States Patent

September 14, 2004
View the Complete Patent at the US Patent & Trademark Office
Soluble polyamic acid salt (PAAS) precursors comprised of tertiary and quaternary amines, ammonium cations, sulfonium cations, or phosphonium cations, are prepared and fabricated into membranes that are subsequently imidized and converted into rigid-rod polyimide articles, such as membranes with desirable gas separation properties. A method of enhancing solubility of PAAS polymers in alcohols is also disclosed.
Ding; Yong (Norwood, MA), Bikson; Benjamin (Brookline, MA), Nelson; Joyce Katz (Lexington, MA)
Praxair Technology, Inc. (Danbury, CT)
09/ 661,902
September 14, 2000
This invention was made with government support under Contract No. DE-FC26-99FT40497 awarded by U.S. Department of Energy. The government has certain rights in the invention.