The quantity of heterocyclic compound is contained considerable in coal liquefied oil on the 1t/d PSU, therefore it is necessary to upgrade the oil for supplying commercial product oil. The heterocyclic compound in the liquefied oil causes forming sludge and coloring. At the 1t/d PSU, the process for decreasing heterocyclic compound in the liquefied oil has been investigated by mean of highly hydrogenation in the hydrotreat unit. However, as highly hydrogenated solvent is supplied to the liquefaction unit, it was predicted that the hydrogenated solvent affects the liquefaction reaction system. In this study, the effect of hydrogenated solvent on the coal liquefaction with batch-autoclave is reported.
