Gas-selectively permeable membrane and method of forming said me

Details Gas-selectively permeable membrane and method of forming said me Gas-selectively permeable membrane and method of forming said me

1987-04-27

1989-05-23

Spear, Frank

Gas separation

Means within gas stream for conducting concentrate to collector

210490, 21050039, 264 41, B01D 5912

Patent

active

048327131

ABSTRACT:
A gas-selectively permeable membrane and a method of forming said membrane are described. This membrane is an asymmetrical pore diameter structure film made of a polyetherimide having the recurring unit represented by formula (A) or a mixture of said polyetherimide and at least one polymer having the recurring unit represented by formula (B), wherein the means pore diameter of a dense layer of the asymmetrical pore diameter structure film is 0.5 micron or less and the means thickness of the dense layer is 10 microns or less: ##STR1## wherein all the symbols are defined in the specification. This membrane is superior in heat resistance and is suitable for use in the isolation of argon from air, for the concentration of oxygen, for the concentration of hydrogen in twon gas, and so forth.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 3992495 (1976-11-01), Sano et al.
patent: 4156597 (1979-05-01), Browall

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