Abstract
Hyper-coal (HPC) is an ash-free coal produced by the solvent de-ashing technology. Coal is thermally (360-420℃) extracted into the coal-derived solvent (two ring aromatics). HPC has excellent thermoplasticity and large potential for coke additive to make a strong coke. The yield of HPC depends on the coal solubility. And the solvent must be recovered completely by distillation. Therefore, it is important for HPC process to use a solvent that have not only high solubility of coal but also enough recovery ratio. In this study, we focused on the extraction heating rate condition. In conventional method, after coal and solvent are mixed, the slurry is heated. In this method, the heating rate is lower than 100 K/min. In order to increase the heating rate solvent is heated to higher temperature than the extraction temperature beforehand, and coal is thrown into high temperature solvent. The latter method enables to increase the heating rate at > 100 K/min., and the consequent coal extraction yield increased with increasing the heating rate.
