Catalytic gasification particulate compositions
First Claim
1. A particulate composition having a particle distribution size suitable for gasification in a fluidized bed zone, the particulate composition comprising an intimate mixture of (a) a biomass char leachate comprising one or more soluble alkali metal compounds, and (b) a non-biomass carbonaceous feedstock, wherein:
- (i) the biomass char leachate comprises an aqueous extract of a biomass char;
(ii) the particulate composition comprises a gasification catalyst which, in the presence of steam and under suitable temperature and pressure, exhibits gasification activity whereby a plurality of gases comprising methane and one or more gases selected from the group consisting of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons are formed;
(iii) the gasification catalyst comprises a source of at least one alkali metal and is present in an amount sufficient to provide, in the particulate composition, a ratio of alkali metal atoms to carbon atoms ranging from 0.01 to about 0.10; and
(iv) the gasification catalyst comprises the one or more soluble alkali metal compounds from the biomass char leachate.
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Abstract
Particulate compositions are described comprising a carbonaceous material, such as petroleum coke and/or coal, treated or otherwise associated with a gasification catalyst, where the catalyst is at least in part derived from a leachate from a biomass char, for gasification in the presence of steam to yield a plurality of gases including methane and at least one or more of hydrogen, carbon monoxide, and other higher hydrocarbons are formed. Processes are also provided for the preparation of the particulate compositions and converting the particulate composition into a plurality of gaseous products.
340 Citations
17 Claims
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1. A particulate composition having a particle distribution size suitable for gasification in a fluidized bed zone, the particulate composition comprising an intimate mixture of (a) a biomass char leachate comprising one or more soluble alkali metal compounds, and (b) a non-biomass carbonaceous feedstock, wherein:
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(i) the biomass char leachate comprises an aqueous extract of a biomass char; (ii) the particulate composition comprises a gasification catalyst which, in the presence of steam and under suitable temperature and pressure, exhibits gasification activity whereby a plurality of gases comprising methane and one or more gases selected from the group consisting of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons are formed; (iii) the gasification catalyst comprises a source of at least one alkali metal and is present in an amount sufficient to provide, in the particulate composition, a ratio of alkali metal atoms to carbon atoms ranging from 0.01 to about 0.10; and (iv) the gasification catalyst comprises the one or more soluble alkali metal compounds from the biomass char leachate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14, 15, 16, 17)
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9. A process for preparing a particulate composition having a particle size distribution suitable for gasification in a fluidized bed zone, the process comprising the steps of:
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(a) providing particulates of a biomass char and a particulate non-biomass carbonaceous feedstock, the biomass char comprising a source of one or more soluble alkali metal compounds as a gasification catalyst; (b) contacting the biomass char with water under suitable temperature and pressure so as to substantially extract the alkali metal compounds from the biomass char and form a leachate, the leachate comprising one or more soluble alkali metal compounds; (c) contacting the carbonaceous feedstock with the leachate to form a slurry; (d) dewatering the slurry to form a wet cake; and (e) thermally treating the wet cake with an inert dry gas to provide a particulate composition, wherein; (i) the gasification catalyst, in the presence of steam and under suitable temperature and pressure, exhibits gasification activity whereby a plurality of gases comprising methane and one or more gases selected from the group consisting of hydrogen, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia and other higher hydrocarbons are formed; (ii) the gasification catalyst is present in an amount sufficient to provide, in the gasification catalyst-loaded carbonaceous feedstock, a ratio of alkali metal atoms to carbon atoms ranging from 0.01 to about 0.10. - View Dependent Claims (10, 11, 12, 13)
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Specification