Permeable membranes for enhanced gas separation

Details Permeable membranes for enhanced gas separation Permeable membranes for enhanced gas separation

B - Operations, Transporting

01

D

18/32

B01D 53/22 (2006.01) B01D 67/00 (2006.01) B01D 69/12 (2006.01)

Patent

CA 1320026

PERMEABLE MEMBRANES FOR ENHANCED GAS SEPARATION Abstract of the Disclosure Composite membranes are prepared by depositing a separation layer on an asymmetric support layer. The separation layer has a selectivity equal to or greater than that of the material of the asymmetric support layer for a desired gas separation. The support layer is desirably produced in non-asymmetric form, and exposed to an elevated temperature approaching the glass transition temperature of the support layer material under non-swelling conditions to modify the structure thereof to create asymmetry therein, before or after the deposition of the separation layer, and to increase its compaction resistance and collapse pressure. Such desirable properties are conveniently achieved on a repeatable basis, enhancing the uniformity and reliability of the treated support layer and of composite membranes produced therefrom, for use in gas separation operations. D-15509

573512

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