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US 6,664,302 B2Granted
Method of forming a feed for coal gasification
AssigneeGTL Energy
InventorsRobert French, Robert A. Reeves, Charles B. Benham
Life of this patent
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Abstract
The invention provides a method by which low-rank coal may be processed to provide a high-energy feedstock for coal gasification and synthesis gas production. Preliminary coal, preparation, which may include washing and drying, is followed by wax-impregnation to produce a high-energy, low-moisture, stable feedstock. The wax is preferably obtained from an on-site Fischer-Tropsch reactor that also produces diesel fuel and naptha.
Claims24
A method of producing a feedstock for coal gasification, comprising:
- a) contacting coal with a Fischer-Tropsch wax at a temperature between about 5° C. and about 30° C. greater than the melting point of said Fischer-Tropsch wax to form a Fischer-Tropsch wax-impregnated coal;
- and,
- b) introducing said Fischer-Tropsch wax-impregnated coal to a coal gasification operation.
A method for utilizing synthesis gas, comprising:
- a) contacting coal with Ficher-Tropsch wax at a temperature between about 5° C. and about 30° C. greater than the melting point of said Fischer-Tropsch wax to form a Fischer-Tropsch wax-impregnated coal,
- b) subjecting said Fischer-Tropsch wax-impregnated coal to coal gasification to produce a synthesis gas;
- c) liquefying said synthesis gas by Fischer-Tropsch synthesis to form products comprising diesel fuel and Fischer-Tropsch wax, wherein said Fischer-Tropsch wax is used in said contacting step of (a).
Dependencies are inferred from the claim text.