Use of treated composite polyamide membranes to separate concent

Details Use of treated composite polyamide membranes to separate concent Use of treated composite polyamide membranes to separate concent

1989-12-13

1990-10-23

Sever, Frank

Liquid purification or separation

Processes

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

21050038, B01D 6102

Patent

active

049649981

ABSTRACT:
A method of separating water of reduced concentration of a selected solute via reverse osmosis, wherein the selected solute is sulfuric acid, sodium hydroxide, isopropanol, sodium nitrate or another solute having a much higher solute passage than sodium chloride. The reverse osmosis membrane is prepared by treating a crosslinked, polyamide discriminating layer with an amine-reactive reagent or compatible oxidant at conditions whereby the passage of the selected solute at a selected transmembrane pressure is reduced by at least 30 percent.

REFERENCES:
patent: 4277344 (1981-07-01), Cadotte
patent: 4705636 (1987-11-01), Small et al.
patent: 4812238 (1989-03-01), Cadotte et al.
patent: 4814399 (1989-03-01), Sansone et al.
patent: 4828708 (1989-05-01), Bray
patent: 4888116 (1969-12-01), Cadotte et al.
FilmTec Technical Bulletin, "FT30 Reverse Osmosis Membrane Biological Protection and Disinfection", Jan. 1988, FilmTec--4002B.

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