Hydroconversion process for heavy hydrocarbon oil

摘要

Disclosed is a process for hydroconverting a heavy hydrocarbon oil in a reactor under high-temperature and high-pressure conditions, wherein said hydroconversion is carried out through using at least three desulfurization catalysts which each contains as active metals transition metals of Group VI and VIII in the Periodic Table supported on an alumina carrier and which have different SI of 40 or higher, 30 or higher and below 40, and lower than 30, respectively, and wherein said at least three catalysts are packed into the reactor in a descending order of SI from the inlet to the outlet of the reactor, with the proportion of the catalyst having SI of 40 or higher is at least 10% by volume, that of the catalyst having SI of 30 or higher and below 40 is at least 20% by volume, and that of the catalyst having SI of lower than 30 is at least 30% by volume.