Membranes formed from rigid aromatic polyimide polymers

Details Membranes formed from rigid aromatic polyimide polymers Membranes formed from rigid aromatic polyimide polymers

1990-05-25

1991-04-23

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 68, 55158, 5283291, B01D 5322, B01D 7164

Patent

active

050096796

ABSTRACT:
The present invention is a class of semi-permeable polymeric membranes and processes for using such membranes to separate one or more components of a gas mixture. The membranes are formed from aromatic polyimides derived from reaction of a 9,9-bis-(3,4-dicarboxyphenyl)-fluorene dianhydride and at least one aromatic diamine. These polyimide membranes exhibit high gas perm-selectivities and are especially useful in effecting the separation of oxygen and nitrogen from air.

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