PURPOSE: To obtain cracked petroleum in a high yield and coke having a high solid carbon content, by adding a metal salt of dithioic acid, an org. phosphate ester, benzothiazole or a disulfide to petroleum heavy oil, and heat-treating the mixture.
CONSTITUTION: In the production of petroleum coke comprising heat-treating petroleum heavy oil, tar sand oil or oil shale oil, at least one member selected from the metal salts of a dialkyl-dithiocarbamic acid, a diaryldithiocarbamic acid, an alkylxanthogenic acid, an arylxanthogenic acid, a dialkyldithiophosphoric acid and a diaryldithiophosphoric acid, org. phosphate esters, benzothiazoles, and disulfides as an additive and raw heavy oil are continuously supplied to a coke drum and heat-treated at 400W550°C. Since said additives are usually used as sntioxidants for lubricating oil, it is thought that the purpose is achieved by stabilizing radicals resulting from heat decomposition in the above reaction system.
MUKOUDA HEIHACHIROU
IDA MASATO
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