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- W4251446543 abstract "Acid-catalysed reaction of selected coal model compounds in trifluoromethanesulfonic acid (TFMS) in the presence of isopentane at 30–150°C was studied, to clarify the catalytic function of TFMS in coal depolymerization reactions. Diphenylmethane (DPM) and benzyl phenyl ether (BPE) were almost completely converted, producing alkylated monocyclic compounds at 30°C. Compounds with a phenolic hydroxyl group easily reacted with benzyl cations, leading to a recombination reaction. In contrast, even at 150°C diphenyl ether (DPE) and biphenyl (BP) gave conversion of only 27 and 86% respectively, suggesting that aromatic ether and phenyl-phenyl linkages are more difficult to cleave in the superacidic medium. Although only 14wt% of Taiheiyo coal is pyridine-soluble (PS), 34wt% of this coal was solubilized by reaction with TFMS in the presence of isopentane at 30°C for 3 days. The increased solubility is mainly ascribed to cleavage of the methylene bridges in the coal. Reaction at 150°C increased the solubility in pyridine to 90wt%. The partial cleavage of phenyl-phenyl and aryl-aryl ether bonds at 150°C contributes to this increase in solubility." @default.
- W4251446543 created "2022-05-12" @default.
- W4251446543 date "1997-01-01" @default.
- W4251446543 modified "2023-10-17" @default.
- W4251446543 title "97/00104 Study on supercritical compressed-gas extraction of coal" @default.
- W4251446543 doi "https://doi.org/10.1016/s0140-6701(97)89880-3" @default.
- W4251446543 hasPublicationYear "1997" @default.
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