1-4-3 350℃程度の穏和な溶剤処理を利用した褐炭の改質(1-4 コークス1,Session 1 石炭・重質油等,研究発表)

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Recently, we proposed degradative solvent extraction at around 350°C as an efficient upgrading method of 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 yields of the three fractions respectively ranged from 17wt% 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 solid fuels and compounds having very similar chemical and physical properties.
2010-08-02