Process for the preparation of chlorine-resistant semipermeable

Details Process for the preparation of chlorine-resistant semipermeable Process for the preparation of chlorine-resistant semipermeable

1988-06-01

1989-12-05

Sever, Frank

Liquid purification or separation

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264 41, B01D 1300, B01D 1304

Patent

active

048850918

ABSTRACT:
Chlorine-resistant semipermeable membranes which comprise an interfacial polymerized reaction product composited on a porous support backing material may be prepared by contacting a porous support material such as polysulfone with an aqueous solution of an aromatic polyamine containing a chlorine substituent on the aromatic ring such as 5-chlor-m-phenylenediamine. The coated support material is then contacted with an organic solvent solution of aromatic polycarboxylic acid chloride such as trimesoyl chloride for a period of time sufficient to form an interfacial polymerized reaction product on the surface of the support material. The resultant semipermeable membrane is then cured at curing conditions to form the desired composite. The resultant membrane composite may be used in separation processes such as desalination of brackish or sea water, the membrane being resistant to attack by chlorine which is present in the water.

REFERENCES:
patent: 4113683 (1978-09-01), Kalnin et al.
patent: 4661254 (1987-04-01), Zupancic et al.
patent: 4772394 (1988-09-01), Swedo et al.

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