Membrane made from a multi-block polymer comprising an oxazolido

Details Membrane made from a multi-block polymer comprising an oxazolido Membrane made from a multi-block polymer comprising an oxazolido

1990-12-06

1991-08-13

Dawson, Robert A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210650, 210651, 210653, 21050038, 523461, B01D 6136

Patent

active

050394185

ABSTRACT:
A multi-block polymer comprising an oxazolidone prepolymer chain extended with a second compatible prepolymer, the membrane made therefrom and the use of said membrane in aromatics
on-aromatics separations is disclosed. The multi-block polymer comprises an oxazolidone containing prepolymer chain extended with a second compatible prepolymer, said second prepolymer selected from the group of prepolymers produced by combining (a) and (A) diisocyanate with a monomer selected from (B) polyester dianhydride or corresponding tetraacid or diacid-diester, and diamine in an A/B mole ratio ranging from about 2.0 to 1.05, preferably 2.0 to 1.1; (b) an (A) dianhydride or its corresponding tetraacid or diacid-diester with a monomer selected from (B) epoxy, diisocyanate, polyester and diamine in an A/B mole ratio ranging from about 2.0 to 1.05, preferably about 2.0 to 1.1, or (c) an (A) diamine with a monomer selected from (B) epoxy, diisocyanate, dianhydride, or its corresponding tetraacid or diacid-diester in an A/B mole ratio ranging from about 2.0 to 1.05, preferably about 2.0 to 1.1, and mixtures thereof. The membranes made from these multi-block polymers comprising thin dense films of said polymer deposited on a micro-porous support are also claimed. The membranes are useful for separating aromatic hydrocarbons from mixtures of same with non-aromatic hydrocarbons under perstraction or pervaporation conditions.

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