Effects of heavy solvent (bp.300-420℃) recycling and partial pressure of H_2S with iron/sulfur catalysts on coal liquefaction were investigated using bench scale unit (BSU). Process operations such as gas recycling and CLB (bp.420℃+) recycling were effective to increase distillate (C_5〜420℃) yield. It was confirmed that applying heavy solvent recycling to the operations, content of lighter fraction in product distillate was increased in maximum distillate yield of Victorian brown coal over than 60%mafc. Furthermore, it was proved that the amount of catalyst addition could be reduced to 1% by using γ-FeOOH as catalyst with excess sulfur to keep suitable partial pressure of H_2S in reactors.
