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

Patent · 30 July 2013

OSTI ID:1088984

Ramkumar, Shwetha; Fan, Liang-Shih

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.

• Research Organization: The Ohio State University Research Foundation (Columbus, OH)
• Sponsoring Organization: USDOE
• DOE Contract Number: FC26-03NT41853
• Assignee: The Ohio State University Research Foundation (Columbus, OH)
• Patent Number(s): 8,496,909
• Application Number: 13/123,746
• OSTI ID: 1088984
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY