MEMBRANE PROCESS FOR PRODUCING CARBON DIOXIDE

摘要

A process for producing carbon dioxide from a gas stream containing same pretreats the incoming raw gas to remove contaminants and particularly to protect degradation of the membranes utilized for separation. The temperatur es of the various gas streams are carefully controlled to reduce water from the stream. By-product and other gas streams of the process are recycled in orde r to increase efficiency by utilizing the heating or cooling properties of the streams. In addition, streams containing minor portions of carbon dioxide ar e returned to the system for recovery.