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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Bibliographic Details
Main Authors IWAMA AKIO, KAZUSE NORITAKA, TASAKA KENTAROU
Format Patent
LanguageEnglish
Published 07.06.1984
Subjects
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
GENERAL PROCESSES OF COMPOUNDING
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
WORKING-UP
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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.
Bibliography:Application Number: JP19820210384