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Adsorption process to recover hydrogen from feed gas mixtures having low hydrogen concentration

United States Patent

April 13, 2010
View the Complete Patent at the US Patent & Trademark Office
A process for selectively separating hydrogen from at least one more strongly adsorbable component in a plurality of adsorption beds to produce a hydrogen-rich product gas from a low hydrogen concentration feed with a high recovery rate. Each of the plurality of adsorption beds subjected to a repetitive cycle. The process comprises an adsorption step for producing the hydrogen-rich product from a feed gas mixture comprising 5% to 50% hydrogen, at least two pressure equalization by void space gas withdrawal steps, a provide purge step resulting in a first pressure decrease, a blowdown step resulting in a second pressure decrease, a purge step, at least two pressure equalization by void space gas introduction steps, and a repressurization step. The second pressure decrease is at least 2 times greater than the first pressure decrease.
Golden; Timothy Christopher (Allentown, PA), Weist, Jr.; Edward Landis (Macungie, PA), Hufton; Jeffrey Raymond (Fogelsville, PA), Novosat; Paul Anthony (Emmaus, PA)
Air Products and Chemicals, Inc. (Allentown, PA)
11/ 685,992
March 14, 2007
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under Cooperative Agreement Number DE-FC36-01GO11087 between Air Products and Chemicals, Inc. and the U.S. Department of Energy. Such government support does not constitute an endorsement by the U.S. Department of Energy. The U.S. Government has certain rights to this invention.