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On the coking process of caking coal, addition of non- or slightly-caking coal decreased the caking properties of coal since dehydrogenation of caking coal occurred by the hydrogen acceptable property of non- or slightly-caking coal. Therefore, the effect of hydrogenation of coal tar pitch (CP) additive on the caking property of Enshu coal was discussed in this study. As a result, the fluidity of Enshu coal was enhanced by the addition of pyridine soluble but toluene insoluble (PSTI) constituent from the hydrogenated CP. It was considered that the hydrogenation of CP enhanced the additive effect of PSTI constituent on the fluidity of Enshu coal because the decreasing weight of PSTI constituent was relatively low on the temperature range of thermal plasticity.
