Hydrogenation and distillation of lubricating oils

Claim 1

THE PROCESS FOR PREPARING AN IMPROVED LUBRICATING OIL FROM A CRUDE LUBRICATING OIL STOCK WHICH CONTAINS ASPHALTIC MATERIALS AND WAX WHICH COMPRISES IN COMBINATION SUBJECTING THE LUBRICATING OIL STOCK TO VACUUM DISTILLATION TO SEPARATE AN UNPRESSABLE DISTILLATE AND AN UNDISTILLED RESIDUE WHICH CONTAINS ASPHALTIC MATERIALS, DE ASPHALTING THE RESIDUE, COMBINING THE DEASPHALTED RESIDUE WITH THE UNPRESSABLE DISTILLATE, CONTACTING THE COMBINATION OF DEASPHALTED RESIDUE AND UMPRESSABLE DISTILLATE WITH HYDROGEN IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF A SULFIDE OF A METAL OF THE LEFTHAND COLUMN OF GROUP VI METALS OF THE PERIODIC SYSTEM AND A MIXTURE OF A SULFIDE OF A METAL OF THE PERIODIC SYSTEM COLUMN GROUP VI METALS OF THE PERIODIC SYSTEM WITH A SULFIDE OF A METAL OF THE ION GROUP AT A PRESSURE BETWEEN ABOUT 2000 AND 4000 P.S.I., AT A TEMPERATURE BETWEEN ABOUT 685* AND 750* F., AT A SPACE VELOCITY BETWEEN ABOUT 0.25 AND 2, THE SPECIFIC REACTION CONDITIONS THAT ARE USED BEING SELECTED WITHIN THESE LIMITS TO RESULT IN EXTENSIVE HYDROGENATION OF AROMATIC HYDROCARBONS INTO NAPHTHENIC HYDROCARBONS, DEWAXING THE HYDROGEN TREATED PRODUCT, SUBJECTING THE HYDROGEN TREATED AND DEWAXED PRODUCT TO VACUUM DISTILLATION TO SEPARATE A PLURALITY OF LUBRICATING OIL FRACTIONS HAVING THE DESIRED SAE VISCOSITY AND SEPARATELY SUBJECTING THESE FRACTIONS TO TREATMENT WITH HYDROGEN IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF A SULFIDE OF A METAL OF THE LEFT-HAND VOLUMN, GROUP VI METALS OF THE PERIODIC SYSTEM, A SULFIDE OF A METAL OF THE LEFT-HAND COLUMN GROUP VI METALS OF THE PERIODIC SYSTEM MIXED WITH A SULFIDE OF A METAL OF THE IRON GROUP, AND OXIDE OF A METAL OF THE LEFT-HAND COLUMN GROUP VI METALS OF THE PERIDOIC SYSTEM, AND OXIDE OF A METAL OF THE IRON GROUP AND MIXTURES OF AN OXIDE OF THE LEFT-HAND COLUMN GROUP VI METALS OF THE PERIODIC SYSTEM WITH AN OXIDE OF A METAL OF THE IRON GROUP AT A PRESSURE BETWEEN ABOUT 500 AND 1000 P.S.S., A TEMPERATURE BETWEEN ABOUT 500* AND 600* F. AND A SPACE VELOCITY BETWEEN ABOUT 0.5 AND 4, SAID CONDITIONS BEING SELECTED WITHIN THESE LIMITS SO THAT SUBSTANTIALLY ALL OLEFINS, DIOLEFINS AND COLOR BODIES ARE HYDROGENATED WITHOUT CAUSING SUBSTANTIAL FORMATION OF LOWER BOILING HYDROCARBONS BY A MEMBER OF THE GROUP CONSISTING OF THERMAL CRACKING AND HYDROCRACKING.