As the development of advanced coal Liquefaction Process, increase in liquefied oil yield and improvement of oil quality were investigated by applying the temperature staged Liquefaction Reaction using Victorian brown coal (Yalloum coal) and Banko coal. From the liquefaction tests using Yalloum coal with process solvent derived from BSU, it was found that middle fraction (boiling point: 180-420℃) was mainly increased approximately 10wt% as the effect of thermal pretreatment at 380℃ before liquefaction reaction. Regarding to the Banko coal, similar effect was conformed although treatment condition is little different from those of Yalloum coal case, due to the difference in the characteristics of thermal decomposition.
