Aromatic polyimide composite separating membrane

Details Aromatic polyimide composite separating membrane Aromatic polyimide composite separating membrane

1984-01-30

1985-07-09

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 16, 4273855, 4274121, 428220, 4284735, B01D 5322

Patent

active

045280045

ABSTRACT:
An aromatic polyimide composite membrane having a satisfactory gas-permeating property and an excellent gas-separating property comprises an aromatic polyimide porous membrane substrate and at least one coating layer which has been prepared (A) by coating at least one surface of the substrate with a dilute dope solution containing 0.01 to 5 parts by weight of a soluble aromatic polyimide and/or polyamic acid dissolved in a solvent which consists essentially of 100 parts by weight of a base component incapable of dissolving therein the substrate in an amount of 3% by weight or more and 0 to 15 parts by weight of an additional component capable of dissolving therein the 5% by weight or more of the aromatic polymeric material and compatible with the base component; and (B) by gradually evaporating the solvent from the coated dilute dope solution layer.

REFERENCES:
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patent: 3754375 (1973-08-01), Bouchilloux et al.
patent: 3822202 (1974-07-01), Hoehn et al.
patent: 3899309 (1975-08-01), Hoehn et al.
patent: 4113628 (1978-09-01), Alegranti
patent: 4156597 (1979-05-01), Browall
patent: 4230463 (1980-10-01), Henis et al.
patent: 4378400 (1983-03-01), Makino et al.

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