METHOD FOR RECOVERING SOLVENT IN DEASHING SOLVENT-PURIFIED COAL

摘要

PURPOSE:To recover efficiently an organic solvent, by adding the organic solvent to solvent-purified coal obtained by a coal liquefaction process and subjecting the resultant settled and separated sludge to steam distillation. CONSTITUTION:An organic solvent is added to a solvent-purified coal obtained by the liquefaction process of coal, and the resultant settled and separated waste sludge is subjected to steam distillation to recover the organic solvent. The resultant distillate obtained by the steam distillation is a mixture of the recovered organic solvent with water. The former is an oily material and the oil-water separation is readly carried out to circulate the oily material as the organic solvent for use. On the other hand, the residue after the steam distillation is in the state of solid dispersed in water and the solid is separated from the water.