Process for preparing an improved lubricating oil

Claim 1

THE PROCESS FOR PREPARING A MULTIGRADE LUBRICATING OIL FROM A HYDROCARBON CHARGE STOCK COMPISING ESSENTIALLY A MIXTURE OF (1) A HIGH BOILING PETROLEUM FRACTION SELECTED FROM THE GROUP CONSISTING OF DEASPHALTED RESIDUM AND UNPRESSABLE DISTILLATE HAVING A V.I. BETWEEN ABOUT 60 AND 100 AND A VISCOSITY AT 210*F. OF BETWEEN ABOUT 70 AND 25 0 S.U.S. AND A (2) HYDROCARBON WAX, THE HYDROCARBON WAX COMPONENT HAVING A MELTING POINT ABOVE ABOUT 120*F. AND CONSTITUTING BETWEEN ABOUT 12 AND 80 PERCENT OF THE HYDROCARBON MIXTURE WHICH PROCESS COMPRISES CONTACTING SAID CHARGE STOCK WITH HYDROGEN AT A PRESSURE ABOVE ABOUT 1750 P.S.I., AT A TEMPERATURE BETWEEN ABOUT 715* AND 825*F., AT A SPACE VELOCITY BETWEEN ABOUT 0.2 AND 4.0 IN THE PRESENCE OF A MIXTURE OF A SULFIDE OF A METAL OF GROUP VI AND A SULFIDE OF A METAL OF THE IRON GROUP COMPOSITED WITH A CRACKING CATALYST HAVING A CRACKING ACTIVITY ABOVE ABOUT I2 ON THE KELLOGG SCALE, WHEREBY NON-WAX HYDROCARBONS CONTAINED IN THE ORIGINAL CHARGE STOCK AND THE HYDROCARBON WAX COMPONENTS ARE CONVERTED INTO LIQUID HYDROCARBONS HAVING THE PROPERTIES OF A MULTIGRADE LUBRICATING OIL, AND SUBJECTING THE PRODUCT TO A TREATMENT FOR SEPARATION OF MULTIGRADE LUBRICATING OIL COMPONENTS.