Process of obtaining lubricating oils from the hydrocracking of asphaltic hydrocarbon oils

Claim 1

A PROCESS FOR PRODUCING AN IMPROVED LUBRICATING OIL WHICH COMPRISES CONTACTING A PETROLEUM HYDROCARBON FRACTION BOILING ABOVE ABOUT 650*F. AND CONTAINING ABOUT 2 TO ABOUT 70 VOLUME PERCENT ASPHALT WITH A RECYCLE STOCK BOILING IN THE RANGE FROM ABOUT 400*F. TO ABOUT 700*F. OBTAINED FROM HYDROCRACKING SAID ASPHALTCONTAINING PETROLEUM HYDROCARBON FRACTION, IN WHICH THE VOLUMETRIC RATIO OF SAID FRACTION RANGES FROM ABOUT 1:1 RESPECTIVELY, TO ABOUT 5:1 RESPECTIVELY, WITH A CATALYST HAVING HYDROGENATION AND CRACKING PROPERTIES IN THE PRESENCE OF HYDROGEN AT PRESSURES IN THE RANGE FROM ABOUT 1700 POUNDS PER SQUARE INCH GAUGE TO ABOUT 4000 POUNSD PER SQUARE INCH GAUGE AT TEMPERATURES IN THE RANGE FROM ABOUT 725*F. TO ABOUT 850*F., A HYDROGEN CIRCULATION RATE IN THE RANGE FROM ABOUT 1000 TO ABOUT 10,000 S.C.F. PER BARREL OF CHARGE, AND A LIQUID HOURLY SPACED VELOCITY FROM ABOUT 0.1 TO ABOUT 2.0 TO OBTAIN A HYDROCRACKED HYDROCARBON OIL AND SEPARATING FROM SAID HYDROCARCKED HYDROCARBON OIL AN IMPROVED LUBRICATING OIL HAVING A VISCOSITY AT 210*F. IN THE RANGE FROM ABOUT 35 TO ABOUT 125 S.S.U. AND A FLASH POINT IN THE RANGE FROM ABOUT 310*F. TO ABOUT 510*F.