Process for separating methane using permeable membrane

Details Process for separating methane using permeable membrane Process for separating methane using permeable membrane

C - Chemistry, Metallurgy

07

C

183/2

C07C 7/144 (2006.01) B01D 69/12 (2006.01) B01D 71/64 (2006.01)

Patent

CA 1321153

ABSTRACT OF THE DISCLOSURE A process for separating methane from a gaseous mixture containing methane and carbon dioxide by concentration is disclosed, which comprises contacting said gaseous mixture with a membrane comprising a film of a polyimide resin having a repeating unit represented by formula (I): Image (I) wherein R1 represents a divalent aromatic, alicyclic or aliphatic hydrocarbon group, or a divalent organic group composed of these hydrocarbon groups linked via a divalent organic linking group. The membrane exhibits excellent selective permeability to carbon dioxide, enabling efficient and stable separation of methane.

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