Back to results
US 4,069,304 AGranted
Hydrogen production by catalytic coal gasification
AssigneeTRW Inc.
InventorsJohn A. Starkovich, Jack L. Blumenthal
Life of this patent
Estimating the term…
Abstract
Coal is catalytically reacted with steam to produce hydrogen. Various Group I metal salts such as K.sub.2 CO.sub.3, Na.sub.2 CO.sub.3 and borax are used as catalysts. These catalysts are stabilized with fluoride containing salts such as CaF.sub.2 to thereby extend their life. Alternatively, NaF was found to be a thermally stable catalyst for the reaction.
Claims12
A process for producing hydrogen comprising the steps of:
- a. reacting steam, carbonaceous material and lime with a catalyst to produce hydrogen, residual carbon and CaCO.sub.3, the catalyst being selected from the group consisting of (1) NaF and (2) a salt of a Group I metal stabilized with a fluoride of a Group II metal;
- b. regenerating CaCO.sub.3 to lime, converting the residual char to combustion products;
- c. reusing the catalyst and regenerated lime for further reaction with steam and carbonaceous material to produce additional hydrogen, and
- d. drawing off product, including hydrogen.
1 more element
A process for producing hydrogen by the CSCL process comprising the steps of:
- a. reacting steam, carbonaceous material and lime with a catalyst in a first reaction zone, said catalyst being selected from the group consisting of (1) NaF and (2) a salt of a Group I metal stabilized with a fluoride salt of a Group II metal;
- b. removing catalyst, CaCO.sub.3, steam and residual char to a second reaction zone;
- c. regenerating CaCO.sub.3 to lime and converting residual char to combustion products in said second reaction zone;
- d. recycling the catalyst and regenerated lime to the first reaction zone and
- e. taking a product stream, including H.sub.2, from the first reaction zone.
2 more elements
Dependencies are inferred from the claim text.