Reduction of membrane fouling by surface fluorination

Details Reduction of membrane fouling by surface fluorination Reduction of membrane fouling by surface fluorination

1991-08-23

1992-09-29

Sever, Frank

Liquid purification or separation

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Material

210639, B01D 7168

Patent

active

051511835

ABSTRACT:
The instant invention is a membrane useful for separating organic matter such as proteins from aqueous solutions which resists fouling and maintains a high flux during separation. The membrane is prepared by either drying a polysulfone composite membrane, or first treating a polysulfone composite membrane with aqueous methanol and then drying it. The membrane is then exposed to elemental fluorine in an inert gas in the substantial absence of oxygen at a temperature in the range of about -45.degree. to 70.degree. C. After fluorine treatment, the membrane is exposed to air. The fluorine content in the treatment mixture may be from 0.0125 to about 10 volume percent, preferably 0.025 to 2 volume percent. The fluorine treatment does not significantly alter the membrane pore size.

REFERENCES:
patent: 4828585 (1989-05-01), Chiano

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