Hydrophilic hollow fiber ultrafiltration membranes that...

B - Operations – Transporting – 01 – D

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B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01) B01D 71/34 (2006.01)

Patent

CA 2441942

A hydrophilic membrane that includes a hydrophobic polymer and a water-soluble polymer-metal comlex is provided. This membrane is made by heating a mixture of a hydrophobic polymer, a metal compounds, and a water-soluble polymer. The water-soluble polymer forms complexes with the metal compound and homogeneously entangles with the dissolved hydrophobic polymer to form a viscous dope. The dope is extruded through an annular orifice to form a hollow fiber. The fiber is put in an environment having a controlled humidity so that it becomes partially solidifed, and then, the fiber is put in a coagulation bath. The hollow fiber is formed by phase inversion in the coagulation bath and is collected using a take-up wheel that is partially immersed in a leaching bath.

La présente invention concerne une membrane hydrophile qui comprend un polymère hydrophobe et un complexe polymère-métal soluble dans l'eau. Pour produire cette membrane, on chauffe un mélange formé d'un polymère hydrophobe, d'un composé métallique et d'un polymère soluble dans l'eau. Le polymère soluble dans l'eau forme des complexes avec le composé métallique et s'enchevêtre de manière homogène avec le polymère hydrophobe dissous pour former une solution à filer visqueuse. La solution à filer est extrudée dans un orifice annulaire pour former une fibre creuse. La fibre est placée dans un milieu à humidité régulée de manière à se solidifier partiellement puis elle est placée dans un bain de coagulation. La fibre creuse est formée par inversion de phase dans le bain de coagulation et récupérée à l'aide d'un tambour de tirage qui est partiellement plongé dans un bain de lixiviation.

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