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Calcium looping process for high purity hydrogen production integrated with capture of carbon dioxide, sulfur and halides

United States Patent

July 30, 2013
View the Complete Patent at the US Patent & Trademark Office
A process for producing hydrogen comprising the steps of: (i) gasifying a fuel into a raw synthesis gas comprising CO, hydrogen, steam, sulfur and halide contaminants in the form of H.sub.2S, COS, and HX, wherein X is a halide; (ii) passing the raw synthesis gas through a water gas shift reactor (WGSR) into which CaO and steam are injected, the CaO reacting with the shifted gas to remove CO.sub.2, sulfur and halides in a solid-phase calcium-containing product comprising CaCO.sub.3, CaS and CaX.sub.2; (iii) separating the solid-phase calcium-containing product from an enriched gaseous hydrogen product; and (iv) regenerating the CaO by calcining the solid-phase calcium-containing product at a condition selected from the group consisting of: in the presence of steam, in the presence of CO.sub.2, in the presence of synthesis gas, in the presence of H.sub.2 and O.sub.2, under partial vacuum, and combinations thereof.
Ramkumar; Shwetha (Columbus, OH), Fan; Liang-Shih (Columbus, OH)
The Ohio State University Research Foundation (Columbus, OH)
13/ 123,746
October 13, 2009
STATEMENT REGARDING FEDERALLY-SPONSORED RESEARCH OR DEVELOPMENT The present invention was made with United States Government support under Grant No. DE-FC26-03NT41853 by the Department of Energy. The United States Government may have certain rights to this invention under 35 U.S.C. .sctn.200 et seq.