MULTISTAGE CASCADE-SWEEP PROCESS FOR MEMBRANE GAS SEPARATION

摘要

A cascade-sweep process for the production of a high purity gas using too or more membranes in combination, which entails: a) collecting a non-permeate stream of a stage N and using the same as a feed stream for a stage N+1, b) collecting a permeate stream of said stage N+1 and feeding the same to a permeate stream of a stage N by counter-current sweep, and c) collecting a permeate of a first stage and a non-permeate of a last stage.