Process for preparing powadir membranes from...

Details Process for preparing powadir membranes from... Process for preparing powadir membranes from...

B - Operations, Transporting

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D

18/15

B01D 71/50 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01) C01B 3/50 (2006.01) C01B 13/02 (2006.01) C08G 64/10 (2006.01) D01D 5/247 (2006.01)

Patent

CA 1319230

ABSTRACT Bisphenol-based polycarbonate membranes wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated are prepared by: forming ~ mixture comprising (i) a bisphenol-based polycarbonate wherein at least 25 percent by weight of the bisphenal moieties are tetrahalogenated, (ii) a solvent for such polycarbonate, and (iii) a non-solvent for such polycarbonate, wherin the mixture has a sufficient viscosity to allow extrusion at temperatures at which the mixture is homogenous heating the mixture to a temperature at which the mixture is a homogeneous fluid and extrudable extruding the heated mixture into ~ shape suitable for membrane use; passing the formed membrane through a quench zone wherein the mixture undergoes phase separation; and removing the major portion of the solvent and non-solvent from the ~ormed membrane. Such membranes are useful in separating oxygen from nitrogen and, in addition to excellent separation factors and flux have excellent mechanical and thermal properties.

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