Method to upgrade low rank coal stocks
First Claim
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1. A method of treating coal comprising:
- a. contacting a coal with an aqueous Fischer-Tropsch waste; and
, b. separating the coal from at least a portion of the aqueous Fischer-Tropsch waste, wherein ash present in the coal is removed in the aqueous Fischer-Tropsch waste.
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Abstract
The ash content of raw coals, lignite, and other carbonaceous materials is reduced by leaching the high-ash material with an aqueous acidic waste product produced by a Fischer-Tropsch reaction. The acidic aqueous waste is mixed with coal and process conditions are described. The claim takes advantage of using otherwise uneconomic coal, lignite or other carbonaceous material by upgrading the material to a suitable feedstock for combustion in a power plant or gasifier.
27 Citations
20 Claims
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1. A method of treating coal comprising:
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a. contacting a coal with an aqueous Fischer-Tropsch waste; and
,b. separating the coal from at least a portion of the aqueous Fischer-Tropsch waste, wherein ash present in the coal is removed in the aqueous Fischer-Tropsch waste. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of preparing a coal slurry comprising:
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a. crushing a coal; and
b. contacting the crushed coal with an aqueous Fischer-Tropsch waste. - View Dependent Claims (18)
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19. A method of coal gasification comprising:
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a. mixing crushed coal with an acidic aqueous Fischer-Tropsch waste to form a slurry;
b. feeding the slurry to a gasifier to produce a syngas; and
c. directing the syngas to a Fischer-Tropsch reactor wherein an acidic aqueous Fischer-Tropsch waste is produced. - View Dependent Claims (20)
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Specification