溶融塩化亜鉛存在下でのベンゾチオフェンおよびジベンゾチオフェンの水素化分解反応

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タイトル別名
  • Hydrocracking of benzothiophene and dibenzothiophene over molten zinc chloride.

抄録

Hydrocracking of benzothiophene was performed to study the catalytic activity of zinc chloride in the desulfurization reaction. Basing on the satisfactory yields of both gaseous and liquid products obtained at 350°C, most of the experiments were made at that temperature. Structural analyses of liquid products confirmed that over the molten zinc chloride, hydrogenation of the sulfur-containing ring took place to yield dihydrobenzothiophene, followed by ring opening at the C-S bond of the saturated part and hydrogenation to produce o-ethylthiophene which then cracked to ethylbenzene, toluene, thiophenol and o-methylthiophenol, releasing H2S and C1-C2 hydrocarbons. The coke formation was suppressed by improving the mixing of benzothiophene, hydrogen and melt; raising the H2/benzothiophene ratio; and diluting the concentration of zinc chloride on the surface of the melt by addition of KCl or LiCl. The presence of a hydrogen-transfer solvent like tetralin also greatly suppressed the coke formation. Thus, it is suggested in view of the high yield of H2S that ZnCl2-NiCl2-LiCl (1:1:1mol ratio) melt is superior to the other catalysts examined in this study.

収録刊行物

  • 石油学会誌

    石油学会誌 23 (6), 390-396, 1980

    公益社団法人 石油学会

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