Taiheiyo, Akabira and Miike Coal pulverized under 100mesh or 24-42 mesh were degradeted thermally using a free fall reactor at the temperature from 450℃ to 800℃. H/C of produced char was measured by the ultimate analysis and the amount of THE solubles remained in the produced char was measured by the extraction. Produced char was also observed by SEM. These experimental results showed clearly that Taiheiyo Coal melted only at the surface, and that THE solubles in the char from Taiheiyo Coal were not so much as those in the chars from Akabira and Miike Coal which melted like ball and stuck together.
