Method of making semi-permeable asymmetric membranes for reverse

Details Method of making semi-permeable asymmetric membranes for reverse Method of making semi-permeable asymmetric membranes for reverse

1974-09-19

1976-05-04

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

210500M, 264217, B29D 2704

Patent

active

039549259

ABSTRACT:
A method of making semi-permeable asymmetric membranes for desalting water in conformity with the method of reverse osmosis from a cellulose acetate casing mixture to which as modifying component there is added ammonia, preferably in gaseous condition, as swelling substance. Preferably a solution of cellulose acetate in acetone is employed into which the gaseous ammonia is introduced up to the desired concentration at room temperature, e. g. of 22.degree. C. Casting of the film followed by a brief evaporation period prior to gelling the film in cold water is done at room temperature.

REFERENCES:
patent: 3290286 (1966-12-01), Kesting
patent: 3444286 (1969-05-01), King et al.
boddeker, K. W., J. Kaschemekat and H. Woldmann, "Ammonia as Modifying Ag for Cellulose Acetate Membranes," in Proceedings of the Fourth International Symposium on Fresh Water From the Sea, Heidelberg, 9-14, Sept. 1973, Vol. 4, pp. 65-71 (reprint).

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