Semipermeable composite membrane and process for preparation the

Details Semipermeable composite membrane and process for preparation the Semipermeable composite membrane and process for preparation the

1979-05-16

1980-12-30

Hart, Charles N.

Liquid purification or separation

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Material

210654, 427246, 521 63, B01D 3900, B01D 1300, B05D 500, C08C 1922

Patent

active

042422086

ABSTRACT:
A semipermeable composite membrane comprising a thin semipermeable film of a polymeric material deposited on one side of the microporous substrate, said polymeric material being prepared by interfacial crosslinking of a polymer containing a recurring unit of the formula ##STR1## wherein each of R.sub.1 and R.sub.2 represents a hydrogen atom or a methyl group, and W.sub.1 represents a direct bonding or a sulfonyl group (--SO.sub.2 --), with a polyfunctional compound containing at least two functional groups selected from acid halide, sulfonyl halide, isocyanate, N-haloformyl, haloformate and acid anhydride groups; and a process for producing the same. The semipermeable composite membrane of this invention is especially useful for desalination of saline or brackish water by reverse osmosis.

REFERENCES:
patent: 3133132 (1964-05-01), Loeb et al.
patent: 3133137 (1964-05-01), Loeb et al.
patent: 3951815 (1976-04-01), Wrasidlo
patent: 4005012 (1977-01-01), Wrasidlo
patent: 4039440 (1977-08-01), Cadotte

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