B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 69/08 (2006.01) B01D 71/34 (2006.01)
Patent
CA 2245591
A method for constructing a polyvinylidene fluoride based hollow fiber membrane from a polymer mixture using temperatures not greater than 80 ~C, the mixture comprising polyvinylidene fluoride, a pore forming agent, and a solvent. The mixture can also comprise a second polymer selected from the group comprising polymethylmethacrylate, polyvinylformal, polyvinyl alcohol, polyhexafluoropropylene, polydiacetylene, cellulose and copolymers thereof. The hollow fiber membranes formed using the controlled temperatures of this invention have acceptable strength characteristics and asymmetrical pore structures which provide a low transmembrane pressure drop.
L'invention concerne un procédé pour la fabrication d'une membrane à fibre creuse en polyfluorure de vinylidène à partir d'un mélange de polymère, en utilisant des températures n'excédant pas 80 ·C; le mélange comprend du polyfluorure de vinylidène, un agent formateur de pores et un solvant, mais il peut aussi renfermer un second polymère choisi dans le groupe suivant: polyméthacrylate de méthyle, formal polyvinylique, alcool polyvinylique, polyhexafluoropropylène, polydiacétylène, cellulose et leurs copolymères. Les membranes à fibre creuse fabriquées sous température contrôlée, selon les indications fournies, ont des caractéristiques de résistance acceptables et des structures de pores asymétriques qui assurent de faibles baisses de pression transmembranaire.
Mckinley David F.
Puglia John P.
Koch Membrane Systems Inc.
Smart & Biggar
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