Separation membranes and process for preparing the same

Details Separation membranes and process for preparing the same Separation membranes and process for preparing the same

1989-06-28

1990-08-14

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 16, 528310, 528335, B01D 5322, B01D 7164

Patent

active

049484001

ABSTRACT:
Polyimide-based separation membranes of this invention are made from polyimides having repeating units of the general formulas (A) and (B) ##STR1## wherein Ar.sub.1 and Ar.sub.3 are tetravalent aromatic radicals containing at least one aromatic ring, Ar.sub.2 is a divalent aromatic radical containing at least one aromatic ring, R.sub.1 and R.sub.2 are organic radicals, R.sub.3 to R.sub.6 are monovalent hydrocarbon radicals, and n is an integer from 1 to 50 at a mole ratio (A)/(B) of 5/95 to 95/5, have high gas permeation coefficients, high mechanical strength, and excellent heat resistance, and are useful for separation and concentration of mixed gases.

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patent: 4838900 (1989-06-01), Hayes

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