9 溶剤中での熱処理を利用した低品位炭の改質(改質・処理・クリーン化(1))

抄録

We have previously presented a new coal solvent extraction method and have shown that the method is effective in separation and structural analysis of coals. In this study we applied this method as an upgrading method of low rank coals. The method treats low rank coals in 1-methylnaphthalene at lower than 350℃ for a certain period and subsequently separates an extract from the residual coal by filtration at that temperature. The extract dissolved in the solvent at room temperature was composed of the compounds whose molecular weights were less than 500. The elemental composition of the low-molecular substances was surprisingly almost the same as those of bituminous coals. Furthermore, the extraction yield was much larger than that obtained through a heat treatment in a nitrogen atmosphere under the same heating condition followed by extraction at 350℃. Thus, it was clarified that the method not only can extract a large amount of low-molecular substances from the low rank coal but also can upgrade those molecules significantly.