Process for preparing membranes from tetrahalobisphenol polycarb

Details Process for preparing membranes from tetrahalobisphenol polycarb Process for preparing membranes from tetrahalobisphenol polycarb

1988-07-29

1990-12-04

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264558, 264561, 26417714, 264184, 264205, 2642091, 2642093, 2642108, 264211, 264 15, 26421116, 21050023, 21050040, B01D 6908, B01D 7150, D01D 5247

Patent

active

049752286

ABSTRACT:
A process for the preparation of a membrane comprising bisphenol-based polycabonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated wherein the halogen is Cl or Br, and the membrane prepared by such process. The process generally comprises: forming a mixture comprising (i) a bisphenol-based polycarbonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogeneated, wherein the halogen is Cl or Br, and (ii) a solvent for such polycarbonate, wherein the mixture has a sufficient viscosity to allow extrusion at temperatures at which the mixture is homogeneous; heating the mixture to a temperature at which the mixture is a homogeneous fluid and extrudable, extruding the heated mixture into a shape suitable for membrane use; passing the formed membrane through a quench zone wherein the mixture undergoes phase separation, and the major portion of the solvent is removed from the formed membrane; wherein the membrane formed is a membrane with a discriminating region capable of separating oxygen from nitrogen.
Such membranes have excellent mechanical and thermal properties.

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Muruganandam, University of Texas at Austin, Separations Research Program, paper presented at fall meeting on Oct. 28 and 29, 1985, "Absorption and Transport in Substituted Polycarbonates and Polystyrene/Tetramethyl Polycarbonate Blends".
Chern et al., Chapter 2 "Material Selection for Membrane Based Gas Separation", i Material Science of Synthetic Membranes, Lloyd, Ed. pp. 25-46, American Chemical Society (1985).

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