Polyimide semipermeable membrane

Details Polyimide semipermeable membrane Polyimide semipermeable membrane

1996-10-25

1999-03-16

Spitzer, Robert

Gas separation: apparatus

Apparatus for selective diffusion of gases

Plural layers

96 14, 21050039, B01D 5322, B01D 7164

Patent

active

058823824

ABSTRACT:
A polyimide resin semipermeable membrane has a continuous structure of a homogeneous skin layer part having an average thickness of 5-1000 nm and a porous layer that is made of the same materials and has the same thickness as the skin layer. The porous layer is formed by the void structure having the average hole diameter of less than 3 .mu.m so that a gas separation membrane can be provided, having high permeability and satisfying cost efficiency requirements can be provided. The above-mentioned membrane is formed by the following steps: a solution is made by adding diethylene glycol dimethyl ether into polyimide; the obtained solution is left for deaeration and adjusted; the film-forming solution is cast on a polyester nonwoven cloth, which serves as a supporting layer, with an applicator; the solution is soaked in water as a solidifying solution for 5 minutes and in a water. Thus semipermeable membrane comprising the homogeneous skin layer part and the porous layer. Crosslinking silicone resin solution may be formed on the surface of the above-mentioned semipermeable membrane to form the overcoat.

REFERENCES:
patent: 3133132 (1964-05-01), Loeb et al.
patent: 3133137 (1964-05-01), Loeb et al.
patent: 4230463 (1980-10-01), Henis et al.
patent: 4277344 (1981-07-01), Cadotte
patent: 4673418 (1987-06-01), Peinemann
patent: 4705540 (1987-11-01), Hayes
patent: 4717393 (1988-01-01), Hayes
patent: 4717394 (1988-01-01), Hayes
patent: 4784880 (1988-11-01), Coplan et al.
patent: 4838900 (1989-06-01), Hayes
patent: 4857080 (1989-08-01), Baker et al.
patent: 4880441 (1989-11-01), Kesting et al.
patent: 4902422 (1990-02-01), Pinnau et al.
patent: 4929405 (1990-05-01), Kohn
patent: 4948400 (1990-08-01), Yamada et al.
patent: 4954144 (1990-09-01), Burgoyne, Jr. et al.
patent: 4983191 (1991-01-01), Ekiner et al.
patent: 4990255 (1991-02-01), Blume et al.
patent: 5055116 (1991-10-01), Kohn et al.
patent: 5061298 (1991-10-01), Burgoyne, Jr. et al.
patent: 5067970 (1991-11-01), Wang et al.
patent: 5071452 (1991-12-01), Avrillon et al.
patent: 5076816 (1991-12-01), Avrillon et al.
patent: 5085676 (1992-02-01), Ekiner et al.
patent: 5085776 (1992-02-01), Blume et al.
patent: 5112941 (1992-05-01), Kasai et al.
patent: 5160353 (1992-11-01), Gochanour
patent: 5163977 (1992-11-01), Jensvold et al.
patent: 5165963 (1992-11-01), Matsumoto et al.
patent: 5178940 (1993-01-01), Matsumoto et al.
patent: 5266100 (1993-11-01), Simmons
patent: 5286539 (1994-02-01), Kusuki et al.
patent: 5320650 (1994-06-01), Simmons
patent: 5322549 (1994-06-01), Hayes
patent: 5443728 (1995-08-01), Macheras et al.
patent: 5558936 (1996-09-01), Chung et al.
patent: 5599380 (1997-02-01), Koros
patent: 5605627 (1997-02-01), Carlsen et al.
patent: 5635067 (1997-06-01), Macheras
patent: 5647894 (1997-07-01), Ohara et al.
patent: 5749943 (1998-05-01), Shimazu et al.
Chern, et al., "Preparation of Composite Membranes via Interfacial Polyfunctional Condensation for Gas Separation Applications", Journal of Applied Polymer Science, vol. 44, 1992, pp. 1087-1093.
Chung, et al., "Development of a defect-free 6FDA-durene asymmetric hollow fiber and its composite follow fibers", Journal of Membrane Science, vol. 88, 1994, pp. 21-36.
Fritzsche, et al., "Polysulfone Hollow Fiber Membranes Spun from Aliphatic Acid (C.sub.2 -C.sub.4): N-Methylpyrrolidone Complexes-Structure Determination by Oxygen Plasma Ablation", Journal of Applied Polymer Science, vol. 41, 1990, pp. 713-733.

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