Mechanism of High Pressure Coal Hydrogenolysis of Taiheiyo Coal

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Abstract
As a result of studies of reaction kinetics and the characteristics of oil products of Taiheiyo Coal, it was surmised that this particular coal has a unique chemical structure with special behaviors as compared against other Hokkaido Coals. Based on this, mild hydrogenolysis under pressure was conducted, and a follow up of the changes of the proceedings of the reaction products ° structural parameters were made. Based on these results, discusions were made on the reaction mechanisms of high pressure hydrogenolysis of Taiheiyo Coal ° the chemical structure thereof. In the chemical reaction occuring in the reaction course, it was noted that (1) the cleavage of the linkage between the mean structural unit, (2) the dealkylation of side chains, and also dealkylation in the direction of shortening the length of side chains, (3) the hydrogenation of condensed aromaticrings was small. It was also noted that in the mean structural unit of the skeletal structure of the main portion of Taiheiyo Coal with regards to condensed aromatic rings was within a degree of two condensed aromatic rings or thereabouts, while the degree of substitutions of aliphatic side chains was around 0.3 and the length of the side chains measured with H0/Hα was over 1. 4. It was also surmized that the linkage of the structural units was stronger than other Hokkaido Coals. For instance, whereas other Hokkaido Coals show a 2 dimensional linkage it was surmized that Taiheiyo Coal has a 3 dimensional linkage. This hypothesis seems to give a satisfactory explanation for the fact that whereas the reaction rate of Taiheiyo Coal is slow the resulting product oil has, in the majority of cases, a low boiling point.

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