Process for preparing hollow fiber having selective gas permeabi

Details Process for preparing hollow fiber having selective gas permeabi Process for preparing hollow fiber having selective gas permeabi

1977-01-17

1978-11-28

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

210500M, 264 49, 264177F, 264187, 264209, 428398, B05B 300, B29D 2700

Patent

active

041276256

ABSTRACT:
Asymmetric hollow fibers useful for effecting separations are prepared by spinning a solution of a fiber-forming cellulose derivative through the outer tube of a double tube-type spinneret into an aqueous coagulating bath to form a hollow fiber and simultaneously injecting an aqueous salt solution through the inner tube of the spinneret to contact the interior of the hollow fiber. The hollow fibers are dipped in warm water, then the free water is removed and the fibers are frozen and dried under vacuum.

REFERENCES:
patent: 3674628 (1972-07-01), Fabre
patent: 3724672 (1973-04-01), Leonard et al.
patent: 3888771 (1975-06-01), Isuge
patent: 3930105 (1975-12-01), Christen et al.
patent: 3944485 (1976-03-01), Rembaur et al.
patent: 3975478 (1976-08-01), Leonard
patent: 4002712 (1977-01-01), Hammer et al.
patent: 4035459 (1977-07-01), Kesting

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