Process for preparing composite membranes

Details Process for preparing composite membranes Process for preparing composite membranes

B - Operations, Transporting

01

D

117/88.5

B01D 69/12 (2006.01) B01D 71/56 (2006.01)

Patent

CA 1335064

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.

585101

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