56.褐炭の熱分解特性に及ぼす高圧アルコール蒸気膨潤 : 爆砕処理の影響

概要

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Morwell brown coal was heat-treated at 260℃ and 300℃ under a vapor of lower alcohols at 1.5-5.8MPa. Then the pressure was instantaneously released, and the swollen coal was rapidly quenched. Predominant absorption in FT-i.r. spectra of coal treated with vapor of methanol and 2-propanol were attributed to aryl-methyl abd aryl-isopropyl ethers, respectively. The combination of explosion and rapid quenching was indispensable for introducing such ethers and disrupting hydrogen bonds irreversibly. The effect of the explosion on thermal degradability of the coal was evaluated by means of the rapid pyrolysis at 764℃ in a Curie-point pyrolyzer. The explode-quenched coal with methanol or 2-propanol yielded 33kg of tar per 100kg of the original coal, 17kg higher than did the untreated coal. The enhanced tar evolution was explained by suppression of cropss-linking reactions as well as donation of hydrogen and alkyl radicals from introduced aryl-alkyl ethers to coal fragment radicals.
一般社団法人日本エネルギー学会の論文
1995-10-26