Recovery of carbon dioxide plant vent gas using membranes.

摘要

A process for recovering CO2 from a CO2 liquifaction plant vent gas, which comprises feeding vent gas from a CO2 liquifaction plant to a first semi-permeable gas separation membrane through which and at a pressure at which CO2 is capable of diffusing therethrough, to form a CO2-enriched permeate, and then returning the CO2-enriched permeate to a feed side of said CO2 liquifaction plant at a pressure capable of effecting the same.