Asymmetric gas separation membranes having graded density skins

Details Asymmetric gas separation membranes having graded density skins Asymmetric gas separation membranes having graded density skins

1989-01-12

1989-11-14

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 66, 55 68, 55 70, 55 71, 55 73, 55158, B01D 5322

Patent

active

048804410

ABSTRACT:
Asymmetric gas separation membranes having graded density skins and macrovoid-free morphology comprised of glassy, hydrophobic polymers are disclosed which are effective for separation gases with significante increases in permeation while maintaining equal or greater separation electivity. The membranes have increased free volume and the graded density skin exhibits a density gradient which becomes more dense with increasing proximity to the surface, the membrane effectively decouples the interdependency between permeability and separation selectivity.

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