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Minimization of steam requirements and enhancement of water-gas shift reaction with warm gas temperature CO2 removal

United States Patent

December 31, 2013
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The disclosure utilizes a hydroxide sorbent for humidification and CO.sub.2 removal from a gaseous stream comprised of CO and CO.sub.2 prior to entry into a water-gas-shift reactor, in order to decrease CO.sub.2 concentration and increase H.sub.2O concentration and shift the water-gas shift reaction toward the forward reaction products CO.sub.2 and H.sub.2. The hydroxide sorbent may be utilized for absorption of CO.sub.2 exiting the water-gas shift reactor, producing an enriched H.sub.2 stream. The disclosure further provides for regeneration of the hydroxide sorbent at temperature approximating water-gas shift conditions, and for utilizing H.sub.2O product liberated as a result of the CO.sub.2 absorption.
Siriwardane; Ranjani V. (Morgantown, WV), Fisher, II; James C. (Morgantown, WV)
U.S. Department of Energy (Washington, DC)
12/ 887,827
September 22, 2010
GOVERNMENT INTERESTS 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 and site-support contractors at the National Energy Technology Laboratory.