| 摘要 |
A novel hydrotreating process is provided, which comprises hydrotreating a mixed oil of a heavy hydrocarbon oil feedstock and at least one additive oil or partially aromatic ring-hydrogenated oil thereof in an amount of 0.3 to 15% by weight with respect to the feedstock, at a temperature of 330 to 460.degree.C, a hydrogen partial pressure of 50 to 250 Kg/cm2, a liquid hourly space velocity (LHSV) of 0.1 to 4.0 hr-1 in the presence of a hydrotreating catalyst, the additive oil being selected from the group consisting of coal-tar oils, tar-sand oils, oil shale- or bitumen-derived oils, and oils obtained by coal liquefaction. According to the process, coke formation, which cause clogging of heat exchangers, an increase in the pressure drop of preheaters, and a decrease in catalytic activity, can be greatly reduced.
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