Abstract
The basic mathematical equations required to analyze the performance of gas separation membranes are introduced, and the design methods for membrane modules are explained for four flow models: perfect mixing, co–current flow, cross flow, and counter–current flow. As specific calculations, the results of three cases of biomethane enrichment, N2 and O2 enrichment by air separation, and H2 and CO2 separation from reformed gas are presented, and the subjects and prospects are discussed. In addition, the paper introduces a high–efficiency process that improves separation performance and provides examples of calculations for efficiency comparisons.
