| 摘要 |
<p>A process for hydrotreating a heavy hydrocarbon oil, wherein the formation of coke is markedly reduced during operation whereby problems associated with the formation of coke, such as an increase in pressure drop in preheaters, a decrease in catalytic activity, clogging of apparatus and impairment of the quality of products, can be solved; therefore, a long-run operation of the hydrotreating plant in a stable state becomes possible. The present process is constituted of charging a heavy hydrocarbon oil feedstock to a hydrotreating reactor with a thermally treated hydrocarbon oil which is obtained by the thermal treatment of a hydrotreated heavy hydrocarbon oil boiling at above 250 DEG C, and/or with a thermally treated hydrocarbon oil which is obtained by the thermal treatment of a fluid catalytically cracked petroleum boiling at above 250 DEG C, and hydrotreating the charged feedstock in the presence of a hydrotreating catalyst, wherein said thermal treatment is accomplished at 400 to 600 DEG C, the amount of thermally treated hydrocarbon oil is 0.3 to 10% by weight on the basis of the heavy hydrocarbon oil feedstock, aromatic rings of said thermally treated hydrocarbon oil is partially hydrogenated prior to charging if necessary, and the hydrotreating catalyst is preferably a specific catalyst which satisfies a specific pore size distribution. <IMAGE></p> |
