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Process for CO.sub.2 capture using zeolites from high pressure and moderate temperature gas streams

United States Patent

March 6, 2012
View the Complete Patent at the US Patent & Trademark Office
National Energy Technology Laboratory - Visit the Technology Transfer Website
A method for separating CO.sub.2 from a gas stream comprised of CO.sub.2 and other gaseous constituents using a zeolite sorbent in a swing-adsorption process, producing a high temperature CO.sub.2 stream at a higher CO.sub.2 pressure than the input gas stream. The method utilizes CO.sub.2 desorption in a CO.sub.2 atmosphere and effectively integrates heat transfers for optimizes overall efficiency. H.sub.2O adsorption does not preclude effective operation of the sorbent. The cycle may be incorporated in an IGCC for efficient pre-combustion CO.sub.2 capture. A particular application operates on shifted syngas at a temperature exceeding C. and produces a dry CO.sub.2 stream at low temperature and high CO.sub.2 pressure, greatly reducing any compression energy requirements which may be subsequently required.
Siriwardane; Ranjani V. (Morgantown, WV), Stevens; Robert W. (Morgantown, WV)
The United States of America as represented by the United States Department of Energy (Washington, DC), N/A (
12/ 582,760
October 21, 2009
STATEMENT OF GOVERNMENTAL SUPPORT The United States Government has rights in this invention pursuant to the employer-employee relationship of the Government to the inventors as U.S. Department of Energy employees at the National Energy Technology Laboratory.