Method for liquefying low rank coal
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United States of America Patent
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Oct 25, 1983
Grant Date -
N/A
app pub date -
Feb 10, 1982
filing date -
Feb 10, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An economical method for liquefying low rank coal is proposed. The method comprises steps of providing water-coal slurry by mixing crushed coal with water, heating the slurry under a pressure to a temperature which is lower than the saturated temperature under the pressure to thereby remove water from the coal with a result that coal content in the slurry be decreased, separating liquid in the slurry from solids, performing heat exchange between the separated liquid and the said pressurized water-coal slurry, then mixing the liquid with crushed coal to provide a further water-coal slurry, mixing the separated solids with a solvent to provide a fluid, evaporating water contents in the fluid, cooling the evaporated water to thereby condense it so as to recover volatile material, heating and pressurizing residual part of the fluid to a temperature and pressure suitable for liquefaction reaction with addition of hydrogen to obtain a liquefaction reactant then subjecting the reactant to a heat exchange with the water-coal slurry to cool the reactant to a temperature suitable for distillation, recirculating at least a part of the liquefaction reactant so that it is used at least a part of the solvent.
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