Hydrogenation process for preparation of lubricating oils

Claim 1

THE PROCESS FOR PRODUCING AN IMPROVED LUBRICATING OIL HAVING A RELATIVELY HIGH VISCOSITY INDEX WHICH COMPRISES IN COMBINATION CONTACTING A LUBRICATING OIL CHARGE STOCK SELECTED FROM THE GROUP CONSISTING OF DEASPHALTED RESIDIUM AND UNPRESSABLE DISTILLATE WITH HYDROGEN AND A CATALYST CONSISTING ESSENTIALLY OF A MIXTURE OF A SULFIDE OF A METAL OF THE LEFT-HAND COLUMN GROUP VI WITH A SULFIDE OF A MEMBER OF THE GROUP CONSISTING OF IRON, COBALT AND NICKEL, SAID CATALYST BEING SUPPORTED UPON A CARRIER HAVING AN ACTIVITY FOR CRACKING CORRESPONDING TO A RATING OF BETWEEN ABOUT 12 PERCENT AND 80 PERCENT ON THE KELLOGG ACTIVITY SCALE, SAID CONTACTING TAKING PLACE AT A TEMPERATURE OF BETWEEN ABOUT 650* AND 825*F., AT A PRESSURE OF BETWEEN ABOUT 1500 AND 10,000 P.S.I.G., AT A SPACE VELOCITY OF BETWEEN 0.25 AND 3.0 LIQUID VOLUMES OF LUBRICATING OIL CHARGE STOCK PER HOUR PER VOLUME OF CATALYST, AT A HYDROGEN RECYCLE RATE OF BETWEEN ABOUT 2,000 AND 15,00 STANDARD CUBIC FEET OF HYDROGEN PER BARREL OF LUBRICATING OIL CHARGE STOCK, AND SEPARATING A HIGH QUALITY LUBRICATING OIL FRACTION FROM THE REACTION PRODUCT.