METHOD OF REFINING HEAVY OIL AND REFINING APPARATUS

摘要

A method of petroleum refining which comprises a solvent extraction step in which a heavy oil is subjected to solvent extraction to obtain an extracted oil and a hydrotreating step in which the extracted oil is hydrotreated in the presence of hydrogen and a catalyst to obtain a hydrorefined oil, wherein the concentration of polyaromatics in the extracted oil obtained in the solvent extraction step is used as an index to control conditions for the solvent extraction in order that the concentration of heptane insolubles in the extracted oil be in a certain range. Thus, the hydrotreating can be conducted under relatively mild conditions.