UTILIZATION OF PETROLEUM WASTE IN COAL-LIQUEFACTION

Coprocessing of coal with a petroleum waste containing grease in waste oil was studied. Experimental parameters such as temperature, pressur e, reaction time, coal loading, and grease loading in the system were examined. Coal conversions were found to increase with temperature, hy drogen pressure, reaction time, and coal loading. Coal conversions in excess of 90% were obtained during coprocessing, with conversions to o il of over 50%. At a fixed coal loading, the presence of a higher amou nt of grease in the system was found to increase the conversion of coa l. This can be explained as due to the catalytic action of the heavy m etals such as molybdenum in the grease during coprocessing. The high a romaticity of waste grease made it a good solvent for coal liquefactio n. The waste oil and waste grease were demetalized during coprocessing , and the viscosity of the oil was reduced.