Gas separating asymmetric membrane

Details Gas separating asymmetric membrane Gas separating asymmetric membrane

1992-09-09

1994-02-15

Kight, III, John

Gas separation: apparatus

Apparatus for selective diffusion of gases

Hollow fiber or cylinder

428 357, 428 369, 4284735, 428 365, 528352, 528353, 2105001, 21050021, 21050023, 21050039, 96 13, B32B 2700, C08G 6926

Patent

active

052865398

ABSTRACT:
A gas separating asymmetric membrane such as a gas separating asymmetric hollow fiber comprises an aromatic polyimide comprising recurring units of the formulae (I) and (II): ##STR1## wherein A.sup.1 is a tetravalent unit having a diphenylhexafluoropropane structure, A.sup.2 is a tetravalent unit having a benzene structure, and A.sup.3 is a divalent aromatic unit which is a unit derived from a sulfur atom-containing diamine such as diaminodibenzothiophene, diaminodiphenylenesulfone, diaminothioxanthene-5,5-dioxide or diaminothioxanthone-5,5-dioxide. The aromatic polyimide contains the recurring unit of the formula (I) in an amount of 40 to 90 molar % and the recurring unit of the formula (II) in an amount of 10 to 40 molar %. Further, a process for the preparation of the gas separating asymmetric hollow fiber membrane is also disclosed.

REFERENCES:
patent: 4690873 (1987-09-01), Makino et al.
patent: 4954611 (1990-09-01), Chen, Sr. et al.

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