Composite hollow fiber membrane and process for its production

Details Composite hollow fiber membrane and process for its production Composite hollow fiber membrane and process for its production

1995-08-17

1998-07-21

Fortuna, Ana

Liquid purification or separation

Filter

Material

210490, 21050038, 21050039, 21020041, 427244, 427245, 427246, 264127, B01D 3321

Patent

active

057830797

ABSTRACT:
A composite hollow fiber membrane is provided, which includes a microporous hollow fiber support membrane and a polymeric ultrathin layer formed on the outer surface of the microporous hollow fiber support membrane by interfacial polymerization, and which contains an organic fluorine compound. Also provided is a process for its production, in which a microporous hollow fiber support membrane is successively contacted with first and second solutions involved in the polymerization, but it is further contacted with a third liquid which is substantially immiscible with the first and/or second solutions and which contains an organic fluorine compound, before and/or after contact with the second solution. Thus, it becomes possible to produce a composite hollow fiber membrane exhibiting excellent permeability and selectivity performance in a continuous and stable manner.

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"Development of Hollow Fiber Reverse Osmosis Membranes", Office of Water Research and Technology Wash., DC, PB81-167215, Nov. 1980, pp. i-iv, 1-32.

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