Process for producing membranes for use in gas separation

Details Process for producing membranes for use in gas separation Process for producing membranes for use in gas separation

1988-02-23

1990-04-24

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 41, 264 461, 264 464, 264129, 264134, 264135, 2642093, 26421113, 264235, 2642356, 264346, 427172, 427322, 427421, 427429, 4274342, B29C 6720

Patent

active

049198564

ABSTRACT:
Method for producing a gas separation membrane comprising a microporous support having provided thereon a non-porous coating layer. The method comprises melt extruding a thermoplastic crystalline polymer under particular melt-extrusion conditions to form a precursor in the form of a hollow fiber or flat film, coating the precursor as a support with a coating substance composed of a natural or synthetic substance capable of forming a polymeric layer which does not form pinholes upon subsequent drawing after solidification to form a coating layer on the surface of the support, and solidifying the coating layer. The support is annealed either before or after the cooling process, and this is followed by cold drawing and heat setting the support to form the gas separation membrane.

REFERENCES:
patent: 4192842 (1980-03-01), Kimura
patent: 4410338 (1983-10-01), Yamamoto et al.
patent: 4440643 (1984-04-01), Makino et al.
patent: 4664681 (1987-05-01), Anazawa et al.
patent: 4704238 (1987-11-01), Okuyama et al.
patent: 4734196 (1988-03-01), Kono et al.

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