Gas separation membrane

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 69/12 (2006.01) B01D 53/22 (2006.01) B01D 69/10 (2006.01) B01D 71/26 (2006.01) B01D 71/32 (2006.01) B01D 71/36 (2006.01)

Patent

CA 2650680

Disclosed is a gas separation membrane comprising a polymeric microporous membrane and a gas-separating thin membrane provided on at least one surface and/or in the inside of the polymeric microporous membrane. The polymeric microporous membrane is produced by wet phase separation method, has a porosity of 20 to 80% inclusive, an average pore size of 1 to 100 nm inclusive and a piercing strength of 2 to 50 N at 100~C, and is composed mainly of polyolefin. The gas-separating thin membrane has an average thickness of not less than 0.01 µm and less than 0.4 µm and is composed mainly of a fluorine-containing gas-separating resin. The gas separation membrane has an oxygen-nitrogen separation factor of 1.4 or greater.

La présente invention concerne une membrane de séparation de gaz comprenant une membrane microporeuse polymère et une membrane mince de séparation de gaz disposée sur au moins une surface et/ou à l'intérieur de la membrane microporeuse polymère. La membrane microporeuse polymère est produite au moyen d'un procédé de séparation en phase humide, a une porosité de 20 à 80 % inclus, une taille moyenne de pores de 1 à 100 nm inclus et une résistance à la perforation de 2 à 50 N à 100 °C, et est principalement composée de polyoléfine. La membrane mince de séparation a une épaisseur moyenne non inférieure à 0,01 µm et inférieure à 0,4 µm et est principalement composée d'une résine fluorée de séparation de gaz. La membrane de séparation de gaz a un facteur de séparation oxygène-azote supérieur ou égal à 1,4.

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