The effect of sulfur addition on coal liquefaction in tetralin.

概要

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To elucidate the mechanism of sulfur participation on coal liquefaction, Yallourn coal was liquefied at 400°C. Even in the absence of catalysts, the addition of sulfur was very effective in tetralin, and the increment of conversion to BS reached to 13%. It was confirmed that during heating up period, sulfur abstracted hydrogen from tetralin to produce hydrogen sulfide and naphthalene. Reaction intermediates such as tetralyl radical and hydrogen sulfide might act as hydrogen donor for coal. Sulfur in the liquefaction residue was three times that of original coal. It suggested the presence of reaction of sulfur with coal. Such a reaction and hydrogen abstraction reaction by sulfur from coal might be detrimental for coal liquefaction, especially without any donor. It was concluded that sulfur and sulfur-derived compounds played important roles as hydrogen donor, shuttler and consumer, and intermediate radicals might accelerate the rupture of chemical bonds in coal.
一般社団法人日本エネルギー学会の論文