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

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.
Issue Date:
OSTI Identifier:
The Ohio State University Research Foundation NETL
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2013 May 13
Research Org:
The Ohio State University Research Foundation, Columbus, OH (United States)
Sponsoring Org:
Country of Publication:
United States

Other works cited in this record:

Novel CO2 Absorbents Using Lithium-Containing Oxide
journal, November 2005
  • Kato, Masahiro; Nakagawa, Kazuaki; Essaki, Kenji
  • International Journal of Applied Ceramic Technology, Vol. 2, Issue 6, p. 467-475
  • DOI: 10.1111/j.1744-7402.2005.02047.x

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