Abstract
Slurry concentration is one of the effective way to improve the efficiency of coal liquefaction process. But it is difficult to make highly concentrated slurry especially in the case of treating a porous coal such as brown coal. The Dual Peaks Solvent System, one of core stages in the BCL Advanced Process^<1)>, has been developed to concentrate the coal slurry in the reactor by removing the lighter solvent after dewatering and thermal treatment of coal. The influence of slurry concentration in the method of Dual Peaks Solvent System was examined by using a gas flow type autoclave with Indonesian BANKO coal. The increasing of distillate yield was strongly appeared by the combined effects of decreasing in CLB and hydrocarbon gases. Hydrogen consumption was also decreased with the increase of coal concentration.
