41.ハイパーコール製造における有機溶媒抽出条件の検討(3) : 亜瀝青炭への適用 [in Japanese] 41. Study on Extraction Condition for HyperCoal Production (3) : Application to Subbituminous Coals [in Japanese]
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Thermal extractions of subbituminous coals were performed to obtain "HyperCoal" (ashless-coal) in a high yield. The extraction yield reached 60% for Pasir coal with an industrial solvent, crude methylnaphthalene oil (CMNO). Acid-treatment prior to the extraction was carried out to enhance the thermal relaxation of the coals. The extraction yield increased; especially the effect was significant when a polar industrial solvent was used.