Process for upgrading lignitic-type coal as a fuel

Details Process for upgrading lignitic-type coal as a fuel Process for upgrading lignitic-type coal as a fuel

C - Chemistry, Metallurgy

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C10L 9/08 (2006.01) C10L 9/00 (2006.01) C10L 9/02 (2006.01)

Patent

CA 1066054

PROCESS FOR UPGRADING LIGNITIC-TYPE COAL AS A FUEL Abstract of the Disclosure A process for upgrading lignitic-type coal including brown coals, lignite and subbituminous coals to render it more suitable as a solid fuel in which the moist lignitic-type coal in an as-mined condition is subjected to an autoclaving treatment at a controlled elevated temperature and under high pressure for a period of time to convert the moisture and a portion of the volatile organic constituents therein to a gaseous phase and to effect a con- trolled thermal restructuring of the chemical structure thereof. In accordance with a preferred practice, the autoclaved upgraded car- bonaceous product during or after cooling is contacted with the gaseous phase to effect a deposition of at least a portion of the con- densible organic constituents thereon. The upgraded carbonaceous product is stable and resistant to weathering, and is of an increased heating value approaching that of bituminous coal.

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