Gas separation material

Details Gas separation material Gas separation material

C - Chemistry, Metallurgy

08

G

183/2, 402/218,

C08G 75/10 (2006.01) B01D 53/22 (2006.01) B01D 63/02 (2006.01) B01D 71/64 (2006.01) C08G 73/10 (2006.01) C08J 9/28 (2006.01)

Patent

CA 2037095

Abstract of the Disclosure A novel class of polyimides useful in making semi- permeable membranes for gas separation is synthesized by the reaction of 4,4'-[hexafluoroisopropylidene]-bis- [phthalic anhydride] (6FDA) with 3,7-diamino-2,8- dimethyldiphenylenesulfone (AMPS). In lieu of the two methyl groups the diamine may be substituted by H or C alkyl. Membranes made from the polyimides have high permeability for CO2 from mixtures containing CO2 and other gases such as CH4 and have commercially acceptable selectivity.

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