THE USE OF POLYCARBONATE CONTAINING SEMIPERMEABLE MEMBRANES IN THE SEPARATION OF GASES

An improved gas separation membrane comprises a thin discriminating layer consisting predominantly of a carbonate polymer derived from a bisphenol corresponding to formula I wherein R at each occurrence is independently H, Cl, Br, or C1-C4 alkyl and R is -CO-, -S-, -SO2-, -O-, a C1-C6 divalent hydro...

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Bibliographic Details
Main Authors BALES, STEPHEN E, JEANES, THOMAS O, FEAY, DARRELL C, ANADA, JOGINDER N
Format Patent
LanguageEnglish
Published 02.09.1992
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
NON-METALLIC ELEMENTS
ORGANIC CHEMISTRY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
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Summary:An improved gas separation membrane comprises a thin discriminating layer consisting predominantly of a carbonate polymer derived from a bisphenol corresponding to formula I wherein R at each occurrence is independently H, Cl, Br, or C1-C4 alkyl and R is -CO-, -S-, -SO2-, -O-, a C1-C6 divalent hydrocarbon radical, or a C1-C6 divalent fluorocarbon radical, or inertly substituted C1-C6 divalent hydrocarbon radical, with the proviso that at least 25 weight percent of the moieties derived from the bisphenol of formula I present in the discriminating layer bear R groups which are exclusively Br or Cl, said gas separation membrane exhibiting a separation factor for oxygen and nitrogen at the ambient temperature of at least 6.1. The membrane has particular application to separating oxygen from nitrogen, or a nitrogen-containing gas.
Bibliography:Application Number: EP19870303173