In this study, differences of coal liquefaction characteristics of Wandoan and Tanitoharum coals are discussed with considering of chemical structure of oil fraction. For Tanitoharum coal, the yield of gas and oil is lower than that of Wandoan coal, reflecting the contents of hydroaromatics in oil fraction from the former lower than that in Wandoan coal. The average molecular weight of oil remains almost constant for both coals, while the content of methane gradually increases with the progress of the reaction, suggesting that oil is gradually dealkylated.
