The invention is a process involving membrane-based gas separation for separating and recovering carbon dioxide emissions from combustion processes in partially concentrated form, and then transporting the carbon dioxide and using or storing it in a confined manner without concentrating it to high purity. The process of the invention involves building up the concentration of carbon dioxide in a gas flow loop between the combustion step and a membrane separation step. A portion of the carbon dioxide-enriched gas can then be withdrawn from this loop and transported, without the need to liquefy the gas or otherwise create a high-purity stream, to a destination where it is used or confined, preferably in an environmentally benign manner.
STATEMENT OF GOVERNMENTAL SUPPORT
The invention was made in part with U.S. Government support under SBIR Award No. DE-NT-000-5312, awarded by the U.S. Department of Energy. The U.S. Government has certain rights in this invention.