B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
117/88.5
B01D 69/12 (2006.01) B01D 71/56 (2006.01) C02F 1/44 (2006.01)
Patent
CA 1333462
An improved composite polyamide membrane and methods of making the membrane are described. This improved membrane is prepared using a cationic polymeric wetting agent in an aqueous solution containing a polyfunctional amine reactant which is interfacially polymerized with an acyl halide to form a thin film polyamide discriminating layer on a microporous support. Alternatively, the wetting agent can be applied directly to the substrate and the interfacial polymerization can occur on said treated substrate. The resulting membrane exhibits an unexpected combination of high water flux, high rejection of divalent anion salts, variable sodium chloride rejection and good caustic resistance at low operating pressures. In one embodiment of this invention, a porous substrate is first treated with an aqueous piperazine solution containing a copolymer of vinylbenzyl dimethyl sulfonium chloride and methacrylic acid and then the coated microporous support is contacted with trimesoyl chloride in an organic solvent.
576135
Fibiger Richard F.
Forgach David J.
Koo Ja-Young
Peterson Robert J.
Schmidt Donald L.
Filmtec Corporation
Smart & Biggar
The Dow Chemical Company
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