Porous multilayered hollow-fiber membrane and process for...

B - Operations – Transporting – 01 – D

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B01D 69/12 (2006.01) B01D 69/08 (2006.01) B01D 71/34 (2006.01)

Patent

CA 2625523

A porous hollow-fiber membrane which is suitable for use in applications such as, e.g., filtration, combines high rejection with water permeability, and has excellent mechanical strength; and a process for stably producing the membrane. The process for producing a porous multilayered hollow-fiber membrane comprises: using a nozzle for hollow-fiber molding having two or more annular orifices concentrically disposed to conduct annular multilayer melt extrusion in which a molten mixture of a thermoplastic resin and an organic liquid is ejected in a tubular form from each annular orifice, the molten mixtures ejected from adjacent annular orifices being different in composition; cooling/solidifying the resultant molten strand to form a hollow fiber; and then removing the organic solvent from the cooled/solidified hollow fiber by extraction. It is characterized in that the molten mixture to be ejected from at least one annular orifice contains inorganic fine particles incorporated by kneading besides the thermoplastic resin and the organic liquid, and that after the cooling/solidification, not only the organic liquid but the inorganic fine particles are removed by extraction.

La présente invention concerne une membrane en fibres creuses poreuse dont l~utilisation convient à des applications telles que la filtration. Cette membrane allie un niveau de rejet élevé à l~imperméabilité à l~eau et possède une excellente force mécanique. L~invention concerne également un procédé destiné à produire la membrane de façon stable. Le processus de production d~une membrane en fibres creuses multicouche poreuse comprend : l~utilisation d~une buse servant au moulage de fibre creuse dotée d~au moins deux orifices annulaires disposés de manière concentrique afin de mener l~extrusion à l~état fondu de multicouche annulaire dans laquelle un mélange fondu de résine thermoplastique et de liquide organique sont éjectés de chaque orifice annulaire en forme tubulaire, les mélanges fondus éjectés des orifices annulaires adjacents sont de composition différente ; refroidissement/solidification du brin fondu résultant afin de former une fibre creuse ; et ensuite retrait du solvant organique de la fibre creuse refroidie/solidifiée par extraction. L~invention est caractérisés en ce que le mélange fondu à être éjecté d~au moins un orifice annulaire contient des particules fines inorganiques incorporées en malaxant d~un côté la résine thermoplastique et le liquide organique, suivi du refroidissement/solidification. Dès lors, non seulement le liquide organique est enlevé par extraction mais le soient aussi les particules fines inorganiques.

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