Treatment of composite polyamide membranes via substitution with

Details Treatment of composite polyamide membranes via substitution with Treatment of composite polyamide membranes via substitution with

1989-12-13

1990-10-02

Sever, Frank

Liquid purification or separation

Processes

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

210651, 210652, 21050038, B01D 6102

Patent

active

049605178

ABSTRACT:
A reverse osmosis membrane having improved rejection of sulfuric acid and/or isopropanol is described. The membrane is prepared by treating a crosslinked, polyamide discriminating layer with an amine-reactive reagent selected from a carboxylic acid ester, a carboxylic acid anhydride, an amine-reactive organic halogen compound, an ethylenically unsaturated hydrocarbon, or a 1,3-propane sultone, at conditions whereby the passage of sulfuric acid in a 2 percent aqueous solution at a transmembrane pressure of 400 psi is reduced by at least 30 percent.

REFERENCES:
patent: 4277344 (1981-07-01), Cadotte
patent: 4705636 (1987-11-01), Small et al.
patent: 4812238 (1987-08-01), Schmidt
patent: 4814399 (1987-07-01), Sansone et al.
patent: 4828708 (1989-05-01), Bray
Technical Bulletin; Filmtec; "FT30 Reverse Osmosis Membrane Biological Protection and Disinfection"; Jan. 1988.
Copending Patent Applications 07/450,691 & 07/450,706.

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