DIE VERWENDUNG VON POLYCARBONAT ENTHALTENDEN SEMIPERMABLE MEMBRANEN FUER DIE TRENNUNG VON GASEN

• Main Authors: ANADA, JOGINDER N., CLAYTON CALIFORNIA 94517, US, JEANES, THOMAS O., ANTIOCH CALIFORNIA 94509, US, BALES, STEPHEN E., MIDLAND MICHIGAN 48640, US, FEAY, DARRELL C., ORINDA CALIFORNIA 94563, US
• Format: Patent
• Language: German
• Published: 25.03.1993
• Edition: 5
• 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

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.