Hydrocracking process

Abstract

Abstract A PROCESS FOR HYDROCRACKING LUBRICATING OIL STOCKS TO LUBRICATING OILS OF HIGHER VISCOSITY INDEX IN WHICH THE PORTIONS OF A CRUDE SUITABLE FOR HYDROCRACKING ARE FRACTIONATED INTO A PLURALITY OF FRACTIONS COMMENSURATE WITH THE BOILING POINT, MOLECULAR WEIGHT, OR POLYFUSED-RING AROMATIC CONTENT AND EACH OF SAID FRACTIONS IS SUBJECTED TO HYDROCRACKING CONDITIONS COMMENSURATE WITH THE POLYFUSED-RING AROMATIC CONTENT OVER A HYDROCRACKING CATALYST AT A TEMPERATURE IN THE RANGE OF ABOUT 650* TO 875* F. AND A HYDROGEN PARTIAL PRESSURE OF AT LEAST ABOUT 1500 P.S.I. PREFERABLY, THE CHARGE STOCK S FRACTIONATED INTO THREE FRACTIONS, THE FIRST FRACTION BOILING IN THE RANGE OF ABOUT 650* TO 850*F., THE SECOND FRACTION BOILING IN THE RANGE OF ABOUT 850* TO 1000*F., AND THE THIRD FRACTION CONTAINING ALL THE MATERIAL BOILING ABOVE ABOUT 1000* F. WHICH HAS BEEN DEASPHATED; AND EACH OF THE FOREGOING FRACTIONS IS SEPARATELY HYDROCRACKED FOR AT LEAST A PORTION OF THE TOTAL TIME IT IS HYDROCRACKED, PREFERABLY OVER A HYDROCRACKING CATALYST COMPRISED OF A SULFIDE OF A GROUP VI METAL, LEFT-HAND COLUMN, AND/OR AN IRON GROUP METAL, AND MOST PREFERABLY A MIXTURE OF NICKEL SULFIDE AND TUNGSTEN SULFIDE IN A 1/1 TO 4.''1 METAL ION RATIO, AT A TEMPERATURE IN THE RANGE OF ABOUT 735* TO 825*F. AND A HYDROGEN PARTIAL PRESSURE OF ABOUT 2500 TO ABOUT 4000 P.S.I.

Inventors

• 👤 Albert T Olenzak
• 👤 Sheldon L Thompson

Bibliographic Details