Reverse osmosis membrane of cellulosic material

Details Reverse osmosis membrane of cellulosic material Reverse osmosis membrane of cellulosic material

1988-09-01

1989-03-21

Sever, Frank

Liquid purification or separation

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264 41, 264298, 264DIG48, 264DIG62, B01D 1304

Patent

active

048140848

ABSTRACT:
There is provided a method of manufacturing cellulose membranes with pore radii less than 30.times.10.sup.-10 m, suitable for reverse osmosis applications. The method comprises dissolving a cellulosic material in a DMSO/PF solvent at a temperature about 125.degree. C. for about 90 min., cooling and casting the solution at room temperature, evaporating the solvent at a temperature of 140.degree.-180.degree. C. and gelling the resulting membrane in a protic solvent, e.g. ethanol or water.

REFERENCES:
patent: 4323627 (1982-04-01), Joh

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