HYDROGENATION TREATMENT OF HEAVY OIL

摘要

PROBLEM TO BE SOLVED: To provide a method for operating stably for a long period a hydrogenation treatment system for petroleum-based heavy hydrocarbons containing metals and sulfur. SOLUTION: This hydrogenation treatment method comprises the 1st process where stock heavy oil comprising petroleum-based hydrocarbons containing both sulfur and metals is mainly hydrodemetallied using reaction column(s) and the 2nd process where the product thus obtained is mainly desulfurized using reaction column(s); wherein the aromaticity index ([the number of the aromatic carbon atoms in the asphaltene]/[the total number of the carbon atoms in the asphaltene]) of the asphaltene in the stock heavy oil is brought to >=0.50, and that of the asphaltene in the product oil from the 1st process to <=0.65.