Ultra-filtration membranes

Details Ultra-filtration membranes Ultra-filtration membranes

B - Operations, Transporting

01

D

6/87

B01D 13/04 (1980.01) B01D 31/00 (1980.01) B29D 27/04 (1980.01)

Patent

CA 1090956

ABSTRACT A process for preparing ultra-filtration membranes and the product thereof, in which a selected cellulosic-ester polymer solution is cast into a thin film, at about ambient temperature, partially dried and immersed in a gelation bath at -20 to +30°C. The gelation bath contains a sufficient percentage by volume of ethyl alcohol or other organic polar compound to ensure that a flux rate in excess of the initial minimum is achieved. In this way, ultra-filtration membranes having water flux rates selected from within the approximate range 14-10,000 gals./sq.ft/day at 100 psig and a molecular weight cut-off above about 15,000, can be produced.

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