GAS SEPARATION MEMBRANE COMPRISING POLYIMIDE
PURPOSE:To provide a polyimide gas separation membrane withstanding the use under a high temp. and holding a high permeation constant ratio at a high temp. CONSTITUTION:This separation membrane is constituted from a polyimide comprising a recurring unit shown by a formula (wherein R is a divalent or...
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Main Authors | , , |
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Format | Patent |
Language | English |
Published |
07.06.1984
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Subjects | |
Online Access | Get full text |
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Summary: | PURPOSE:To provide a polyimide gas separation membrane withstanding the use under a high temp. and holding a high permeation constant ratio at a high temp. CONSTITUTION:This separation membrane is constituted from a polyimide comprising a recurring unit shown by a formula (wherein R is a divalent org. group, pref., an aromatic group) and having a homogeneous layer having no fine pores each having a pore size of 25Angstrom or more and a thickness of 10mum or less. This polyimide is prepared by the condensation polymerization of 1, 2, 3, 4-butanetetracarboxylic acid and diamine. Thus obtained separation membrane is enabled in gas separation at a temp. up to max. 400 deg.C and can be subjected to the gas separation of a gaseous mixture, especially, in a temp. range of 100-300 deg.C. |
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Bibliography: | Application Number: JP19820210384 |