Method of gelling cast, polysulfone membranes

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

1982-09-10

1984-05-29

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

By casting liquids on a solid supporting or shaping surface

264212, 26433111, 521 27, 525906, B29D 706

Patent

active

044514247

ABSTRACT:
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 gaseous 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.

REFERENCES:
patent: 3444286 (1969-05-01), King et al.
patent: 4026977 (1977-05-01), Bourganel

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