C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/25
C08J 9/28 (2006.01) B05D 5/00 (2006.01) B05D 7/22 (2006.01)
Patent
CA 1126455
TITLE A METHOD OF CASTING A REVERSE OSMOSIS OR ULTRAFILTRATION POLYMERIC MEMBRANE INVENTORS Oleh Kutowy William L. Thayer Srinivasa Sourirajan ABSTRACT OF THE DISCLOSURE In the method of casting a reverse osmosis or ultrafiltration polymeric membrane on a wall of a porous support having a first and a second side, wherein the first side is coated with a cellulose ester casting solution to at least partially impregnate the support, solvent carrier of the casting solution is partially evaporated to leave a residue, and then the residue gelled with a gelation liquid, the improvement comprising the residue adjacent with the second side is gelled with a relatively-larger-pore-forming gelation liquid to that used to gel-residue adjacent the first side, the relatlvely-larger-pore-forming gelation liquid having a monohydric alcohol mole fraction content of at least 0.1. This, together with particular temperatures for the gelation liquids, causes relatively larger pores to be formed towards the second side of the porous support which do not provide such a undesirable impediment for, for example, water flux on the low pressure side of the membrane under service con- ditions. The method is particularly useful for casting tubular, polymeric membrane anchored to the inner surface of a porous, tubular support and where the relatively larger pores are adjacent the outer surface of the porous support.
336704
Kutowy Oleh
Sourirajan Srinivasa
Thayer William L.
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