The disclosure relates generally to a gas separation membrane and a gas separation method in which at least one type of gas is separated and recovered from a gas mixture, using the gas separation membrane. The gas separation membrane is asymmetric and hollow and made of a polyimide material. The method of the invention provides a practical, high-performance technique for gas separation.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT
 This invention was made with Government support under contract number DE-AC07-05ID14517, awarded by The Department of Energy. The Government has certain rights in the invention.