Treatment of hydrocarbon oils

Claim 1

A PROCESS FOR TREATING SULFUR-BEARING HYDROCARBON OILS WHICH COMPRISES CONTACTING A SULFUR-BEARING HYDROCARBON OIL OF UNSATURATED NATURE UNDER HYDROGENATION CONDITIONS AT A PRESSURE OF AT LEAST 10 ATMOSPHERES AND AT A TEMPERATURE BETWEEN 350* C. AND 500* C. IN THE PRESENCE OF AN ADDED GAS CONSISTING LARGELY OF HYDROGEN WITH AN IMPREGNATED TYPE MOLYBDENUM OXIDE CATALYST CONSISTING ESSENTIALLY OF AN ALUMINA CARRIER WHICH CATALYST HAS BEEN TREATED WITH A STRONG INORGANIC ACID FOR AT LEAST 16 HOURS AT A TEMPERATURE OF ABOUT 90* C. AND IMPREGNATED WITH FROM 4 TO 8% MOLYBDENUM AND ABOUT 12% COBALT AND BETWEEN ABOUT 2.5 AND 25% OF POTASSIUM EACH BASED ON THE MOLYBDENUM, SAID CATALYST HAVING BEEN CALCINED IN THE PRESENCE OF OXYGEN AT A TEMPERATURE OF FROM ABOUT 700* C. TO ABOUT 800* C. FOR A PERIOD OF FROM 2 TO ABOUT 40 HOURS.