Asymmetrical ultrafiltration membrane based on cellulose hydrate

Details Asymmetrical ultrafiltration membrane based on cellulose hydrate Asymmetrical ultrafiltration membrane based on cellulose hydrate

1979-04-10

1980-11-18

Griffin, Ronald W.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

210500M, 536 69, 536 76, B01D 1300, B01D 3100, B29D 2704

Patent

active

042345286

ABSTRACT:
An asymmetrical ultrafiltration membrane based on cellulose hydrate which may be dried without destructive shrinkage and which has been saponified without reduction in flow-through or separation performance is prepared by adding hydrophobic synthetic silicic acid to a casting solution based on cellulose triacetate optionally partially substituted by cellulose diacetate, and then casting the cellulose acetate membrane and saponifying to the cellulose hydrate form.

REFERENCES:
patent: 3412184 (1968-11-01), Sharples et al.
patent: 3475375 (1969-10-01), Yates
patent: 3901810 (1975-08-01), Brooks et al.
patent: 3954925 (1976-05-01), Boddeker
patent: 3957935 (1976-05-01), Staude
patent: 4026978 (1977-05-01), Mungle et al.
patent: 4145295 (1979-03-01), Kutowy et al.
patent: 4147622 (1979-04-01), Nussbaumer

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