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

B - Operations, Transporting

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B01D 53/22 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01) B01D 69/12 (2006.01) B01D 71/68 (2006.01)

Patent

CA 1321686

36-21(5440)A ASYMMETRIC GAS SEPARATION MEMBRANES HAVING GRADED DEMSITY SKINS Abstract of the Disclosure Asymmetric gas separation membranes having graded density skins and macrovoid-free morphology comprised of glassy, hydrophobic polymers are dis- closed which are effective for separating gases with significant increases in permeation while maintaining equal or greater separation selectivity. The mem- branes 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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