Reverse osmosis membrane

Details Reverse osmosis membrane Reverse osmosis membrane

1975-01-16

1977-08-02

Spear, Jr., Frank A.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210500M, 264 41, B01D 3100, B01D 1300

Patent

active

040394409

ABSTRACT:
A reverse osmosis membrane is prepared by reaction of a film or layer of polyethylenimine with a polyfunctional reagent whose functional groups are capable of reacting with amine groups. The polyfunctional reagent is preferably a water-soluble, aromatic or heterocyclic compound having acid chloride or isocyanate functional groups.
The membrane is preferably prepared in situ on a polysulfone or chlorinated polyvinyl chloride support by initial formation of a layer of polyethylenimine on the support, followed by interfacial reaction with the polyfunctional reagent to produce a thin surface coating possessing salt barrier characteristics.

REFERENCES:
patent: 3276996 (1966-10-01), Lazare
patent: 3647086 (1972-03-01), Mizutani et al.
patent: 3714010 (1973-01-01), Suszer
patent: 3723306 (1973-03-01), Bridgeford
patent: 3744642 (1973-07-01), Scala et al.
patent: 3951815 (1976-04-01), Wrasidlo

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