Copolyimide gas separation membranes derived from substituted me

Details Copolyimide gas separation membranes derived from substituted me Copolyimide gas separation membranes derived from substituted me

1989-06-01

1990-06-12

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 68, 55158, B01D 5322

Patent

active

049329839

ABSTRACT:
Semiflexible aromatic polyimides for preparing gas separation membranes and the process of using to separate at least one gas from a mixture of gases is disclosed. The aromatic polyimides are prepared by polycondensation of aromatic tetracarboxylic dianhydrides with 20 to 80 mol percent of a methylene dianiline which is alkyl substituted on all positions ortho to the amine functions. The remaining diamine constituent is not so substituted.

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