High flux semipermeable membranes

Details High flux semipermeable membranes High flux semipermeable membranes

1989-08-30

1990-08-21

Sever, Frank

Liquid purification or separation

Filter

Material

21050037, 264 455, B01D 6100, B01D 6700, B01D 6900

Patent

active

049504045

ABSTRACT:
High flux semipermeable membranes which comprise a polymerized reaction product within and/or on a porous support may be prepared by contacting the porous support such as a polysulfone sheet with an aqueous solution of an polyamine, said aqueous solution containing a polar aprotic solvent not reactive with amines and optionally an acid acceptor. The surface of the coated support is dried to the touch and then contacted with an organic solution of an polycarboxylic acid halide for a period of time sufficient to form a polymerized reaction product within and/or on the surface of the support material. The resulting composite may be post treated by washing with an alkaline compound. The resultant membrane composite may be used in separation processes such as the desalination of brackish or seawater, or the softening of domestic hard water.

REFERENCES:
patent: 4277344 (1981-07-01), Cadotte
patent: 4772394 (1988-09-01), Swedo et al.
patent: 4792404 (1988-12-01), Swedo et al.
patent: 4802984 (1989-02-01), Waite

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