Preparation and evaluation of CO2-permselective membrane for high temperature gas separation

Abstract

With the greenhouse effect in mind, we have been studying the CO2 recovery thermal power generation system. In this system, it is necessary to recover CO2 from LNG reformed fuel gas using a high temperature gas separation system. By a trial calculation of the efficiency of a power generation plant with CO2 recovery system, it is appeared that membrane separation offered low power and low cost. A homogeneous silica-base membrane was obtained by the advanced sol-gel method with a polymer-hybrid. The gas separation factor of H2 to CO2 and the factor of N2 to CO2 was larger than 100 at 673 K. H2 permeability was on the order of 10-7 mol/m2·s·Pa order. This performance remained almost constant for 720 hours.