Method of manufacturing a semipermeable membrane from a water-so

Details Method of manufacturing a semipermeable membrane from a water-so Method of manufacturing a semipermeable membrane from a water-so

1974-09-06

1976-11-16

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

20415914, 20415916, 20415919, 2041592, 2041601, 204165, 204168, 210500M, 260 25M, 264 49, 264340, 264344, B29C 2500, B29D 2700

Patent

active

039924955

ABSTRACT:
Ultrathin membranes for separating substances are obtained by exposing shaped articles comprising a water-soluble polymer or a mixture of a water-soluble polymer and water-insoluble polymer to a plasma of a gas selected from helium, argon, nitrogen, hydrogen, oxygen, carbon monoxide, carbon dioxide, ammonia, a hydrocarbon having 1 to 10 carbon atoms, an epoxide having 2 to 10 carbon atoms, or an alkylamine, or a mixture of these substances to crosslink the surface layer, and then washing the exposed articles with water to remove the unreacted portions. The membrane exhibits outstanding performance characteristics when used in the processes for separating or concentrating substances, such as reverse osmosis, ultrafiltration, and the like.

REFERENCES:
patent: 3661735 (1972-05-01), Drelich
patent: 3692653 (1972-09-01), Drelich et al.
patent: 3720321 (1973-03-01), Coughlin et al.
patent: 3723289 (1973-03-01), Boom
patent: 3846521 (1974-11-01), Osterholtz
patent: 3847652 (1974-11-01), Fletcher et al.
patent: 3864289 (1975-02-01), Rendall
patent: 3880966 (1975-04-01), Zimmerman et al.

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