Method of making asymmetric cellulose triacetate membranes

Details Method of making asymmetric cellulose triacetate membranes Method of making asymmetric cellulose triacetate membranes

1975-07-17

1977-05-31

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

106176, 106187, 210500M, 264217, B29D 2704, B29D 2720, B01D 3900

Patent

active

040269787

ABSTRACT:
Asymmetric cellulose triacetate semipermeable membranes cast from a solution of cellulose triacetate having an acetyl content of at least 43 percent in a solvent mixture having a ratio of dioxane to acetone of at least about 1.5 to 1, which solution also contains a swelling agent in the form of a low molecular weight alcohol or a low molecular weight mono- or poly-basic acid. Solvent is evaporated from one surface of the cast film to form a dense gel layer and the film is immersed in water to provide an asymmetric semipermeable membrane having a high salt-rejection capability and good flux.

REFERENCES:
patent: 3497072 (1970-02-01), Cannon
patent: 3846404 (1974-11-01), Nichols
patent: 3878276 (1975-04-01), Hoernschemeyer
patent: 3883626 (1975-05-01), Kamide et al.
patent: 3884801 (1975-05-01), Kesting
patent: 3917777 (1975-11-01), Asada et al.

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