Multistage annealing of aramide reverse osmosis membranes

Details Multistage annealing of aramide reverse osmosis membranes Multistage annealing of aramide reverse osmosis membranes

1984-09-27

1986-07-22

Anderson, Philip

Liquid purification or separation

Filter

Material

264 41, 264235, 264346, 21050038, C08J 928, B29C 7102

Patent

active

046018271

ABSTRACT:
A process for forming a reverse osmosis membrane is disclosed. The process involves casting a solution of an aromatic polyamide and a modifying salt to form a layer which is dried and quenched with water to gel the aromatic polyamide, and annealed in water at 40.degree.-110.degree. C. and preferably 40.degree. to 90.degree. in a plurality of stages with the final stage being at more than 60.degree. C.

REFERENCES:
patent: 3567632 (1971-03-01), Richter et al.
patent: 3718722 (1973-02-01), Lee
patent: 3822202 (1974-07-01), Hoehn
patent: 3878109 (1975-04-01), Ikeda et al.
patent: 4086215 (1978-04-01), Kurihara et al.

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