Separation membrane and method of preparing and using same

Details Separation membrane and method of preparing and using same Separation membrane and method of preparing and using same

1984-03-23

1985-07-09

Spitzer, Robert H.

Gas separation

Means within gas stream for conducting concentrate to collector

55 68, 55158, 210654, 264342R, 528353, B01D 5322

Patent

active

045279993

ABSTRACT:
A differential pore-collapsed separation membrane particularly useful as a gas-separation membrane and a method of preparing such differential pore-collapsed membrane, which method comprises treating an asymmetric membrane, while under one-sided constraint, with a treating solution comprising a volatile nonsolvent and a swelling agent and/or a solvent, and drying the treated membrane, to provide for the controlled, differential pore collapse of the small pores of the top skin of the membrane to a smaller pore-size distribution in the membrane generally less than about 10 Angstroms.

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