Process for separating methane using permeable membrane

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

1988-11-14

1990-10-23

Chaudhuri, Olik

Gas separation

Means within gas stream for conducting concentrate to collector

55 68, 585818, 208308, B01D 5910

Patent

active

049648870

ABSTRACT:
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): ##STR1## wherein R.sup.1 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.

REFERENCES:
patent: 4240914 (1980-12-01), Iwama et al.
patent: 4358378 (1982-11-01), Iwama et al.
patent: 4474662 (1984-10-01), Makino et al.
patent: 4474858 (1984-10-01), Makino et al.
patent: 4705540 (1987-11-01), Hayes

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