Method of gelling cast, polysulfone membranes

Details Method of gelling cast, polysulfone membranes Method of gelling cast, polysulfone membranes

C - Chemistry, Metallurgy

08

J

18/24

C08J 9/28 (2006.01) B01D 67/00 (2006.01) B01D 71/68 (2006.01)

Patent

CA 1168007

TITLE A METHOD OF GELLING CAST, POLYSULFONE MEMBRANES INVENTORS Thomas A. Tweddle William L. Thayer Oleh Kutowy Srinivasa Sourirajan ABSTRACT OF THE DISCLOSURE Polysulfone cast films, including polyethersulfone cast films, are partially gelled with mineral acid prior to or during the conventional water gelation to control the porosity of and improve the productivity of reverse osmosis and ultrafiltration membranes thus produced. The partial gelation may be carried out prior to the water gelation by contacting the cast film with the mineral acid in a gaseous or aqueous form and the gase- ous form may be diluted with air. The partial gelation may, in different embodiments, be carried out simultaneously with the conventional gelation by dissolving the mineral acid in the gelation liquid.

395978

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