Method of making a multilayer capillary membrane

Details Method of making a multilayer capillary membrane Method of making a multilayer capillary membrane

1991-11-27

1993-09-07

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264129, 264173, 264174, 26421112, 427245, D01D 5247

Patent

active

052426360

ABSTRACT:
A multilayer membrane for separating gas mixtures includes a polymer supporting membrane with a voids volume of more than 50% and a coating of two or more separating layers made of two or more different polymers. A hollow capillary serving as the supporting membrane is guided through the central bore of a spinneret. The spinneret has one or several concentric annular slits and/or annular grooves, through each of which a solution of one of the polymers forming the separating layers is applied to the supporting membrane. The spinneret terminates in a sealed chamber in which the solvent or solvents of the polymer solutions is/are evaporated and removed. The coated supporting membrane is drawn out of the chamber and wound up, possibly following aftertreatment with heat and/or liquids.

REFERENCES:
patent: 3874986 (1975-04-01), Browall et al.
patent: 4061821 (1977-12-01), Hayano et al.
patent: 4230463 (1980-10-01), Henis et al.
patent: 4826599 (1989-05-01), Bikson et al.
patent: 4880440 (1989-11-01), Perrin
Abstract of Japan 62-286,508 (Dec. 1987).
Abstract of Japan 1-176,405 (Jul. 1989).
Abstract of Japan 1-127,023 (May, 1989).

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