Process for preparing composite membranes

Details Process for preparing composite membranes Process for preparing composite membranes

1987-12-10

1988-11-08

Lusignan, Michael

Coating processes

Foraminous product produced

Filter, sponge, or foam

210490, 21050037, 21050038, 21050041, 4274121, B01D 2504, B01D 2940, B05D 500

Patent

active

047833467

ABSTRACT:
A multistage process for preparing interfacially polymerized polyamide reverse osmosis membranes on a microporous support is disclosed. The process involves applying a solution containing from 1 to 10 wt % of an aromatic diamine having 1 or 2 aromatic rings and 2 to 3 amino groups in a first solvent to the microporous substrate. Then a solution of an aromatic or cyclophatic acyl chloride having 1 or 2 rings and 2.2 to 4 acyl chloride groups in a solvent immiscible with the first solvent is applied to the microporous substrate. Then a solution of different acyl chlorides is applied to the substrate. The acyl chlorides in this second solution can have 2 to 4 acyl chloride groups attached to an aliphatic group of 6 to 12 carbon atoms or an aromatic or cycloaliphatic group having 1 or 2 rings and containing 8 to 14 carbon atoms. Also suitable for the second treatment are bis chloroformates.

REFERENCES:
patent: 3567632 (1971-03-01), Richter et al.
patent: 4277344 (1981-07-01), Cadotte
patent: 4520044 (1985-05-01), Sundet
patent: 4529646 (1985-07-01), Sundet
patent: 4626468 (1986-12-01), Sundet

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