Abstract
Coal-derived liquid, from Japanese Taiheiyo coal, obtained under mild hydrogenation was analysed to elucidate the chemical structure of parent coal. The n-hexane soluble neutral part was fractionated into 7 parts by vacuum distillation. The analysis of the lower three fractions has already been reported. The higher boiling three fractions, DS04 (5.1 wt% of neutral oil), DS05 (27.3 wt%) and DS06 (27.7 wt%) were separated by liquid chromatography according to hydrocarbon types and each sub-fraction was analysed by g.c. and g.c.-m.s. Saturates were most abundant and in the distribution of n-alkanes, even carbon number saturates were greater than those of odd carbon. Some sub-fractions contained tricyclic diterpanes, steranes and hopane type triterpanes. Mono-, di- and tri-aromatic diterpanes were also found. Two aromatic ring hydrocarbons with some naphthene rings were the most abundant type.
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