Process for producing composite semipermeable membrane employing

Details Process for producing composite semipermeable membrane employing Process for producing composite semipermeable membrane employing

1992-03-11

1994-06-28

Owens, Terry J.

Coating processes

Foraminous product produced

Microporous coating

21050038, 21050041, B05D 304

Patent

active

053245385

ABSTRACT:
A process of producing a composite semipermeable membrane which includes applying a polyfunctional amine solution and a polyfunctional acid halide solution in a hydrocarbon-based solvent having a flash point of not lower than 10.degree. C. on a surface of a microporous substrate to allow interfacial polycondensation reaction so as to form a cross-linked polyamide-based ultra-thin membrane superposed on the microporous substrate, then blowing a gas on the surface of the ultra-thin membrane so as to evaporate the hydrocarbon-based solvent, which gas has a velocity at the surface of 2-20 m/sec., a temperature of 10.degree.-80.degree. C. that is lower than the flash point of the hydrocarbon-based solvent, and an absolute humidity of not less than 1 g of water per 1 kg of dry gas.

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