Process for hydrocracking of nitrogen containing hydrocarbon oils with countercurrent flow of the oil with hydrogen in the reactor

Claim 1

IN THE PROCESS FOR HYDROCRACKING A HYDROCARBON OIL CONTAINING A NITROGEN COMPOUND WHICH COMPRISES THE STEPS OF DISPOSING A SOLID HYDROCRACKING CATALYST WHOSE ACTIVITY IS REDUCED BY CONTACT WITH NITROGEN COMPOUNDS IN A SINGLE STAGE REACTION ZONE, MAINTAINING IS SAID ZONE A TEMPERATURE WITHIN THE RANGE OF ABOUT 675*F. TO 950*F. AND A PRESSURE OF ABOUT 750 TO 3,000 POUNDS PER SQUARE INCH, CONTACTING THE HYDROCARBON OIL WITH HYDROGEN IN SAID REACTION ZONE UTILIZING A SPACE VELOCITY BETWEEN ABOUT 0.2 AND 3, AND REMOVING THE HYDROCRACKED PRODUCTS FROM SAID REACTION ZONE WHEREBY A SUBSTANTIAL FRACTION OF THE HYDROCARBON IS HYDROCRACKED, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID HYDROCARBON OIL WITH HYDROGEN BY INTRODUCING THE HYDROCARBON OIL INTO THE UPPER PORTION OF SAID REACTION ZONE AND CAUSING IT TO FLOW DOWNWARDLY INTO SAID REACTION ZONE, INTRODUCING SAID HYDROGEN INTO THE LOWER PORTION OF SAID REACTION ZONE AND CAUSING IT TO FLOW UPWARDLY THROUGH SAID REACTION ZONE AND UTILIZING SPECIFIC TEMPERATURES AND PRESSURES WITHIN THE RANGES SPECIFIED WHICH RESULT IN THE REMOVAL OF AT LEAST 80 PERCENT OF THE HYDROCRACKED PRODUCT FROM THE TOP OF THE REACTION ZONE.