Polyimide gas separation membrane and gas separation method

Details Polyimide gas separation membrane and gas separation method Polyimide gas separation membrane and gas separation method

B - Operations, Transporting

01

D

B01D 71/64 (2006.01) B01D 53/22 (2006.01) B01D 69/08 (2006.01)

Patent

CA 2712691

Disclosed are a gas separation membrane and a gas separation method in which at least one species of organic vapor is separated and recovered from an organic vapor mixture using the gas separation membrane. The gas separation membrane is made of an aromatic polyimide composed of a tetracarboxylic acid component consisting of an aromatic ring-containing tetracarboxylic acid and a diamine component comprising 10 to 90 mol% of a combination of (B1) 3,4'-diaminodiphenyl ether and (B2) 4,4'-diaminodiphenyl ether at a B1 to B2 molar ratio, B1/B2, ranging from 10/1 to 1/10, and 10 to 90 mol% of other aromatic diamine.

L'invention porte sur une membrane de séparation de gaz constituée d'un polyimide aromatique qui est préparé à partir d'un composant acide tétracarboxylique consistant en un acide tétracarboxylique contenant un noyau aromatique et un composant diamine comprenant 90 à 10 % en moles d'un mélange de 3,4'-diaminodiphényléther (B1) et de 4,4'-diaminodiphényléther (B2) et 10 à 90 % en moles d'une autre diamine aromatique à un rapport molaire B1/B2 de 10/1 à 1/10 ; et sur un procédé de séparation de gaz par séparation et récupération d'au moins une vapeur organique à partir d'un mélange de vapeurs organiques par l'utilisation de la membrane.

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