PURPOSE: To remarkably reduce the formation of carbonaceous substances, prolong the period of continuous running, and increase the yield of a light liq. product in the process for converting a heavy oil into a light oil.
CONSTITUTION: 100 pts.wt. heavy oil is mixed with 0.1-50 pts.wt. at least one hydrogen-donating substance selected from the group consisting of a hydrogenated oil which is obtd. by subjecting an oil boiling at 200°C or higher and obtd. by the thermal cracking of petroleum at 430-600°C to nuclear hydrogenation to a degree of nuclear hydrogenation of 20-90% and another hydrogenated oil which is obtd. by thermally treating at 430-600°C an oil boiling at 200°C or higher and obtd. by the catalytic cracking or reformation of petroleum and subjecting the resulting oil boiling at 200°C or higher to nuclear hydrogenation to a degree of nuclear hydrogenation of 20-90%.
YAMASHITA CHUICHI
KATO OSAMU
