Hydrotreating of the mixed oils of coal liquid and petroleum gas oil (gas oil) have been carried out to clarify the relationship between the properties of product oils and the ratio of coal liquid to gas oil. The coal liquid was the distillate produced from 1 ton/day solvent-coal liquefaction plant. The gas oil was commercial gas oil without additives. Ni-Mo-Al2O3 commercial catalyst (KF-840) was used as a hydrotreating catalyst. Four mixed oils were prepared as feedstocks; 10, 30, 50 and 100 vol % of coal liquid were mixed with 90, 70, 50 and 0 vol % of gas oil, respectively.
The smaller ratio of coal liquid to gas oil resulted in the higher per cent denitrogenation and the higher per cent hydrogenation of product oils.
The hydrotreating of model compound, quinoline, has been carried out as well. The lower concentration of quinoline gave the higher per cent denitrogenation of quinoline. The higher aromaticity of solvent gave the lower per cent denitrogenation of quinoline.