PROCESS FOR CO2/NATURAL GAS SEPARATION

摘要

THE INVENTION INCLUDES A PROCESS FOR SEPARATING CO2 FROM NATURAL GAS INCLUDING : CONTACTING A MIXTURE OF CO2 AND NATURAL GAS WITH A FIRST SIDE OF A CARBON MEMBRANE IN A MANNER TO CAUSE A PORTION OF THE MIXTURE TO PASS THROUGH THE CARBON MEMBRANE TO A PERMEATE SIDE . THE RESULTING MIXTURE ON THE PERMEATE SIDE BECOMES ENRICHED IN CO2 OVER THAT OF THE MIXTURE ON THE FIRST SIDE . THE CARBON MEMBRANE INCLUDES AN ASYMMETRIC HOLLOW FILAMENTARY CARBON MEMBRANE, INCLUDING A PARTIAL CARBONIZATION PRODUCT OF AN ASYMMETRIC HOLLOW FILAMENT INCLUDING AN AROMATIC IMIDE POLYMER MATERIAL . THE CARBON MEMBRANES IS AT LEAST 95 WEIGHT PERCENT CARBON , AND HAS A DENSE LAYER LOCATED IN THE OUTSIDE SURFACE PORTION OF THE HOLLOW FILAMENTARY MEMBRANE AND A POROUS BASE LAYER CONTINUED FROM THE DENSE LAYER AND LOCATED IN THE INSIDE PORTION OF THE HOLLOW FILAMENTARY MEMBRANE. THE CONTACTING IN STEP OCCURS AT A PRESSURE OF AT LEAST ABOUT 200 PSIA .