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Sulfur control in ion-conducting membrane systems

United States Patent

August 5, 2003
View the Complete Patent at the US Patent & Trademark Office
A method for controlling the sulfur dioxide partial pressure in a pressurized, heated, oxygen-containing gas mixture which is contacted with an ion-conducting metallic oxide membrane which permeates oxygen ions. The sulfur dioxide partial pressure in the oxygen-depleted non-permeate gas from the membrane module is maintained below a critical sulfur dioxide partial pressure, p.sub.SO2 *, to protect the membrane material from reacting with sulfur dioxide and reducing the oxygen flux of the membrane. Each ion-conducting metallic oxide material has a characteristic critical sulfur dioxide partial pressure which is useful in determining the required level of sulfur removal from the feed gas and/or from the fuel gas used in a direct-fired feed gas heater.
Stein; VanEric Edward (Allentown, PA), Richards; Robin Edward (Lansdale, PA), Brengel; David Douglas (Schnecksville, PA), Carolan; Michael Francis (Allentown, PA)
Air Products and Chemicals, Inc. (Allentown, PA)
10/ 015,892
November 15, 2001
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under Contract No. DE-FC26-98FT40343 between Air Products and Chemicals, Inc. and the U.S. Department of Energy. The Government has certain rights to this invention.