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Permeation of carbon dioxide has been measured for two types of composite polymeric hollow fiber membranes for feed pressures up to 18MPa at a temperature of 313K. The membranes consist of a polyamide copolymer (IPC) layer or a polyvinyl alcohol (PVA) layer on top of a polyethersulfone (PES) support membrane. For both membranes, the carbon dioxide permeance has a maximum as a function of the feed...