Gas separation material

Details Gas separation material Gas separation material

1990-03-21

1991-08-27

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55158, 528313, B01D 5322, B01D 7164

Patent

active

050429922

ABSTRACT:
A novel class of polyimides useful in making semipermeable 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.sub.2-4 alkyl. Membranes made from the polyimides have high permeability for CO.sub.2 from mixtures containing CO.sub.2 and other gases such as CH.sub.4 and have commercially acceptable selectivity.

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Kim et al., "Relationship Between Gas Separation Properties and Chemical Structure in a Series of Aromatic Polyimides," Journal of Membrane Science, 37 45-62 (1988).

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