Chlorine-resistant semipermeable membranes

Details Chlorine-resistant semipermeable membranes Chlorine-resistant semipermeable membranes

B - Operations, Transporting

01

D

117/88.5

B01D 69/12 (2006.01)

Patent

CA 1339054

Chlorine-resistant semipermeable membranes which comprise an interfacial polymerized reaction product composite 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, said aqueous solution containing a polyhydric compound and an acid acceptor. The coated support material is then contacted with an organic solvent solution of an aromatic polycarboxylic acid halide for a period of time sufficient to form an interfacial polymerized reaction product on the surface of the support material. The resulting composite is then post treated by washing with an alkaline compound, leaching with sodium bisulfite and treating the leached composite with a polyhydric compound. The resultant membrane composite may be used in separation processes such as the desalination of brackish or sea water, the membrane being resistant to attack by chlorine which is present in the water.

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