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US 8,502,007 B2Granted
Char methanation catalyst and its use in gasification processes
AssigneeGreatpoint Energy, Inc.
InventorsEdwin J. Hippo, Vincent G. Reiling, Earl T. Robinson, Pattabhi K. Raman, Jeffery Smith, Charles Mims, Nicholas Charles Nahas
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Abstract
The invention provides processes for generating a methane-enriched gas from a gas mixture comprising carbon monoxide and hydrogen such as gas streams generated by gasification of an alkali metal catalyst-loaded carbonaceous feedstock, and a char methanation catalyst useful in such processes.
Claims10
A process for the production of a methane-enriched gaseous product, comprising the steps of:
- (a) gasifying a carbonaceous material in a gasifying reactor, in the presence of steam and an alkali metal gasification catalyst, to produce a gaseous product stream and an alkali metal-containing solid char product, wherein the gaseous product stream comprises methane, carbon monoxide, carbon dioxide and hydrogen;
- (b) withdrawing the alkali metal-containing solid char product from the gasifying reactor;
- (c) introducing a gaseous mixture comprising hydrogen and carbon monoxide into a reaction zone containing at least a portion of the alkali metal-containing solid char product as a methanation catalyst,
- (d) reacting at least a portion of the hydrogen with at least a portion of the carbon monoxide in the reaction zone, under suitable temperature and pressure, in the presence of the alkali metal-containing solid char product to produce a methane-enriched gaseous product, and
- (e) recovering a methane-enriched gaseous product from the reaction zone.
2 more elements
Dependencies are inferred from the claim text.