No.57 溶剤を用いた350℃程度の分解抽出による低品位炭の炭種非依存成分への転換(改質・処理・クリーン化(1))

概要

論文の詳細を見る
We have recently proposed degradative solvent extraction at around 350°C as an efficient method of upgrading low rank coals. In this study eight low rank coals including lignites and subbituminous coals were thermally treated and fractionated by using 1-methylnaphthalene at 350°C. The coals were partly decomposed and were separated into three fractions having different molecular weights, Soluble, Deposit and Upgraded Coal. The yield of the three fractions respectively ranged from 18wt% to 27wt%, 4 wt% to 17 wt%, and 47 wt% to 64 wt% on d.a.f. coal basis. The carbon contents of the three fractions were much larger than those of the raw coals, suggesting that a significant amount of oxygen was effectively removed from the coal during the treatment. The interesting findings were that the Solubles obtained from the eight coals were very close to each other in elemental composition, chemical structure, molecular weight distribution, pyrolysis behavior, and softening/melting behavior. It was also the case with all the Deposits obtained from the eight coals. Thus, the proposed degradative solvent extraction method was found to be effective in converting low rank coals into compounds having very similar chemical and physical properties.
2010-09-21