Hydrotreating of Three Kinds of Coal-derived Liquids and the Properties of Their Upgraded Oils

Abstract

Coal-derived liquids obtained from three different coals were hydrotreated over a presulfided Ni-W/Al₂O₃ catalyst, and their HDN reactivities were compared with each other. The coal liquid with the lower boiling range and with the lower content of nitrogen has the higher HDN reaction rate because of the smaller retarding effect of polyaromatics and ammonia. The cetane index of the two-step hydrotreated oils were around 36, which indicates that the cetane number would be below 45. Then the coal-derived oils should be mixed with conventional petroleum gas oil fractions for the economical uasage as a diesel fuel.