Alkyl substituted polyimide, polyamide and polyamide-imide gas s

Details Alkyl substituted polyimide, polyamide and polyamide-imide gas s Alkyl substituted polyimide, polyamide and polyamide-imide gas s

1992-09-02

1993-11-30

Spitzer, Robert

Gas separation: processes

Selective diffusion of gases

95 34, 96 14, B01D 5322, B01D 7164

Patent

active

052661008

ABSTRACT:
Novel aromatic polyimide, polyamide and polyamide-imide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides, polyamides and polyamide-imides are formed from diamines of the formula ##STR1## where Ar' is ##STR2## Q is nothing or an aromatic group and Z is independently alkyl groups having 1 to 10 carbon atoms, most preferably a tertiary butyl group, n is an integer from 0 to 4, preferably 1.

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