Liquid purification or separation – Filter – Material
Patent
1987-11-18
1988-09-06
Sever, Frank
Liquid purification or separation
Filter
Material
528312, 528363, B01D 1300
Patent
active
047691484
ABSTRACT:
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.
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Fibiger Richard F.
Forgach David J.
Koo Ja-Young
Petersen Robert J.
Schmidt Donald L.
Sever Frank
The Dow Chemical Company
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