Ash in coal is a major problem in utilizing of coals. In order to make ashless coal (Hypercoal, HPC) with high production yield, solvent extraction at 360-380℃ was carried out using various organic solvents. The effects of different coals and solvents on the HPC yield and the ash content were investigated. When various coals was treated with dimethylnaphthalene at 360℃ for 60min in a batch reactor, the extraction yields of 21-39% was obtained regardless of coal rank. We succeeded in obtaining HPC under 0.1% of ash for several coals.
