7.溶剤脱灰法を用いた低品位炭の改質効果

抄録

This study concerns with applying the Hyper-coal process for the low rank coal upgrading. Hyper-coal process has been developed based on the solvent de-ashing technology. Coal is extracted with coal derivative 2-ring aromatic recycle solvent and insoluble matter is removed by gravity settling. From the coal extraction examination with a number of coals, we found that the Hyper-coal yields of brown coals were not higher (20-40wt.% daf), but the heat values of both Hyper-coal and the insoluble coal were highly increased by the effects of the elimination reactions of the oxygen containing functional groups. It was observed that the carboxyl group and the hydroxyl group were constantly decreased with the increase in temperature, but the ether linkage was suddenly increased at 350-400℃. There was a possibility that such a bridge formation inhibited the coal dissolving.