Hydrocracking of Wandoan Coal Liquids (I):The Relation between Hydrocracking and Hydrodenitrogenation

概要

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In order to determine the mechanism of hydrocracking of coal liquids, heavy fractions of Wandoan coal liquids were hydrocracked in tetralin solvent containing a small amount of 14C-labeled naphthalene. Wandoan coal liduids were separated into hexane-solubles (HS), toluene-solublehexane-insolubles (HIS-TS) and toluene insolubles (TIS). Hydrocracking of these fractionswas performed with a fixed bed flow microreactor on Ni-Mo-Al2O3 catalyst.Reaction conditions were as follows the temperature was 400°C, pressure 9.8 MPa, H2flow 25 1/h, and WHSV 0 .68/h. The distributions of reaction products and nitrogenconcentrations were determined. The amount of the rehydrogenation of naphthalenesolvent during the hydrocracking was examined by 14C tracer method. The results are summarized as follows; 1) When HS was hydrocracked, it was hydrodenitrogenated and hydrocracked to light oil. Furthermore, the rehydrogenation of naphthalene solvent proceeded considerably. 2) In the case of hydrocracking of HIS, HS was produced by hydrogenation and denitrogenation of HIS. But the nitrogen content of HIS did not decrease and the solvent was not rehydrogenated. 3) In the case of hydrocracking of SRC, HIS was hydrocracked faster than HS, but the hydrocracking of HS and the rehydrogenation of naphthalene solvent did not occur. Therefore, the hydrogenation of each separated fraction is effective to produce light oil.
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