Process for the preparation of chlorine-resistant polyester semi

Details Process for the preparation of chlorine-resistant polyester semi Process for the preparation of chlorine-resistant polyester semi

1990-02-20

1991-05-07

Sever, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

21050027, 264 41, B01D 6108, B01D 6700, B01D 6900, B01D 7148

Patent

active

050134485

ABSTRACT:
Semipermeable membranes comprising polyesters which are resistant to chlorine are prepared by casting on a porous support backing material either a solution comprising a blend of a polymeric hydroxyalkyl acrylate and a polymeric monocarboxylic acid, or a polymeric polycarboxylic acid, or a solution containing a prepolymer which has been formed by the reaction of a polymeric hydroxyalkyl acrylate with an acryloyl halide or an anhydride of a dicarboxylic acid. The porous support backing material is contacted with the solution at contacting conditions, following which the excess solution is removed and the solution-coated porous support backing material is then cured at curing conditions. This membrane will possess excellent characteristics of salt rejection and flux as well as being resistant to the action of chlorine which is present in water which is subjected to a desalination process.

REFERENCES:
patent: 3879495 (1975-04-01), Fujil et al.
patent: 4168352 (1979-09-01), Dick et al.
patent: 4267295 (1981-05-01), Gallop et al.
patent: 4277334 (1981-07-01), Ruidisch et al.
patent: 4415455 (1983-11-01), Osei-Gyimah et al.
patent: 4443315 (1984-04-01), Iijima et al.
patent: 4704324 (1987-11-01), Davis et al.

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