Ion-exchange group bearing composite membranes

Details Ion-exchange group bearing composite membranes Ion-exchange group bearing composite membranes

1974-09-10

1976-03-23

Esposito, Michael F.

Liquid purification or separation

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Material

260 21E, 260 22R, 210506, 427243, 427340, B01D 3916, B01D 3100

Patent

active

039459276

ABSTRACT:
Composite membranes bearing ion-exchange groups suitable for use in membrane separation processes are produced by providing a porous substrate which is physically semipermeable by itself, applying a coating composition consisting essentially of a filmforming polymeric material to which ion-exchange groups are introduceable and a liquid medium onto the surface of said substrate, removing said liquid medium to provide an ultrathin membrane of said material having a thickness less than 10 microns, and treating said ultrathin membrane to provide said ion-exchange groups throughout said ultrathin membrane.

REFERENCES:
patent: 3342729 (1967-09-01), Strand
patent: 3549016 (1970-12-01), Rigopulos
patent: 3556305 (1971-01-01), Shorr
patent: 3648845 (1972-03-01), Riley
patent: 3762566 (1973-10-01), Del Pico
patent: 3799355 (1974-03-01), Salyer
patent: 3808305 (1974-04-01), Gregor

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