Novel polyamide reverse osmosis membranes

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making

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264148, 264DIG48, 264DIG62, B01D 1304

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active

048593842

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.

REFERENCES:
patent: 3567632 (1969-08-01), Richter et al.
patent: 3600350 (1971-08-01), Kwolek
patent: 3687842 (1972-08-01), Credali et al.
patent: 3696031 (1972-10-01), Credali et al.
patent: 3744642 (1973-07-01), Scala et al.
patent: 3878109 (1975-04-01), Ikeda et al.
patent: 3904519 (1975-09-01), McKinney, Jr. et al.
patent: 3926798 (1975-12-01), Cadotte
patent: 3945926 (1976-03-01), Kesting
patent: 3948823 (1976-04-01), Lee et al.
patent: 3951789 (1976-04-01), Lee et al.
patent: 3951815 (1976-04-01), Wrasidlo
patent: 3993625 (1976-11-01), Kurihara et al.
patent: 4005012 (1977-01-01), Wrasidlo
patent: 4039440 (1977-08-01), Cadotte
patent: 4048271 (1977-09-01), Kesting
patent: 4132219 (1979-01-01), Idel et al.
patent: 4142035 (1979-02-01), Idel et al.
patent: 4147622 (1979-04-01), Nussbaumer
patent: 4259183 (1981-03-01), Cadotte
patent: 4277344 (1981-07-01), Cadotte
patent: 4302336 (1981-11-01), Kawaguchi et al.
patent: 4337154 (1982-06-01), Fukuchi et al.
patent: 4337185 (1982-06-01), Wessling et al.
patent: 4387024 (1988-06-01), Kurihara et al.
patent: 4426489 (1984-01-01), Wessling et al.
patent: 4525526 (1985-06-01), Wessling et al.

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