Abstract: The eco-friendly light white oil was prepared by hydrogenation of coal direct liquefaction diesel in a 30 mL continuous hydrogenation device using Pd-Pt hydrogenation catalyst at 80～240 ℃,6～12 MPa，LHSV 0.4～1.2 h－1. The results showed that no significant changes in the boiling range, viscosity，density of the diesel oil after hydrogenation was observed. However，the mass fraction of aromatics in the oil is reduced to ＜0.01 % under certain hydrogenation conditions. It was also found that the brand of light white oil produced from direct liquefied diesel is mainly concentrated in the range of WI 40～WI 110.

Key words: direct coal liquefaction, diesel, hydrogenation, light white oil