B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/24
B01D 67/00 (2006.01) B29C 67/20 (2006.01) B29C 41/12 (2006.01)
Patent
CA 1313735
TITLE A METHOD OF CASTING A POROUS MEMBRANE OF POLYMERIC MATERIAL INVENTORS Thomas A. Tweddle Oleh Kutowy André Tremblay ABSTRACT OF DISCLOSURE A method of casting porous membranes of polymeric material is provided wherein the membrane has at least one of the following: a more homogeneous active skin layer for separation purposes with a lower molecular weight cut off, a more homogenous active skin layer with a sharper molecular weight cut off curve, a relatively thinner active skin layer with a relatively greater flux for a given separation of a substance from a solution thereof, and relatively fewer imperfections throughout the active skin layer. The method comprises casting a layer of a casting solution (e.g. polysulfone in N-methyl pyrrolidinone) on to a support, to provide a cast layer of the casting solution thereon with an exposed skin, then progressively submerging the cast layer in a gelation liquid (iced water) at a relative velocity of at least 15 cm/second, whereby the exposed skin is gently scrubbed with gelation liquid to continuously remove outwardly diffusing solvent therefrom and dissipate exothermic heat, thus causing gelation of at least a stable, more homogeneous active skin layer, with build-up of a solvent boundary layer between the exposed surface of the layer and the gelation liquid minimized.
553861
Kutowy Oleh
Tremblay Andre
Tweddle Thomas A.
Anderson J. Wayne
Kutowy Oleh
National Research Council Of Canada
Tremblay Andre
Tweddle Thomas A.
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