SEMI-PERMEABLE MEMBRANES CONSISTING PREDOMINANTLY OF POLYCARBONATES DERIVED FROM TETRAHALOBISPHENOLS

• Main Authors: DARREL C. FEAY, JOGINDER N. ANADA, THOMAS O. JEANES, STEPHEN E. BALES
• Format: Patent
• Language: English
• Published: 31.12.1991
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOUNDS THEREOF; GENERAL PROCESSES OF COMPOUNDING; 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; WORKING-UP

THE INVENTION IS AN IMPROVED GAS SEPARATION MEMBRANCE COMPRISING A THIN DISCRIMINATING LAYER CONSISTING PREDOMINATLY OF A CARBONATE POLYMER DERIVED FROM A BISPHENOL CORRESPONDING TO FORMULA I(FORMULA I)WHEREIN R AT EACH OCCURENCE IS INDEPENDENTLY H, CI, BR OR C1-C4 ALKYL AND R1 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 CI, SAID GAS SEPARATION MEMBRANCE EXHIBITING A SEPARATION FACTOR FOR OXYGEN AND NITROGEN AT THE AMBIENT TEMPERATURE OF AT LEAST 6.1. IN ANOTHER ASPECT THIS INVENTION RELATES TO A PROCESS FOR SEPARATING OXYGEN FROM NITROGEN, OR A NITROGEN-CONTAINING GAS.