Skip to Content
Find More Like This
Return to Search

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

United States Patent

November 3, 2015
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)
13/ 892,681
May 13, 2013
STATEMENT REGARDING FEDERALLY-SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under Grant No. DE-FC26-03NT41853 awarded by the Department of Energy. The government has certain rights to the invention.