Abstract
A hydrogenation reaction of Akabira coal with recycle solvent was car-ried out, using hydrogenated anthracene oil as a starting solvent. Also, one through exper-iment using anthracene oil as a solvent under the same reaction conditions was carried out as a comparisonThe compound type analyses on the product oil of one through experiment and recycle solvent were performed by means of HPLC-GC/MS method, which has been proposed pre-viously. The amounts of hydroaromatic compounds in recycle solvents decrease and those of aromatic compounds increase with the recycle number. But, with more than five recycling runs the amounts of hydroaromatic compounds seem to gradually increase.This is due to hydrogen donation of hydroaromatic compounds to fragments created by thermal rupture of the coal structure during the initial stage of the run. During further runs, hydroaromatic compounds were produced by hydrogenation of aromatic compounds in solvent and by hydrogenolysis of coal under Red mud-S as a catalyst. Therefore, an im-provement in hydrogen donor ability for solvents is expected again with further experimen-tal runs. In this experiment, in the last sixth recycle solvent, the donor ability did not rise to a satisfactory level and the composition of this solvent was still not in equilibrium.
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