Hydrocracking process with the use of a y type crystalline zeolite and a nitrogen containing hydrocarbon oil

Claim 1

A PROCESS FOR THE LOW-TEMPERATURE CATALYTIC HYDROCRACKING OF NITROGEN-CONTAMINATED MINERAL OIL FEEDSTOCKS OVER LONG PERIODS OF TIME WITHOUT CATALYST REGENERATION, WHICH COMPRISES CONACTING A MIXTURE OF HYDROGEN AND A MINERAL OIL FEEDSTOCK CONTAINING AROMATIC HYDROCARBONS AND BETWEEN ABOUT 1 AND 2,000 PARTS PER MILLION OF ORGANIC NITROGEN WITH A FIXED BED OF GRANULAR HYDROCRACKING CATALYST COMPRISING A MINOR PROPORTION OF A GROUP VIII METAL HYDROGENATING COMPONENT DEPOSITED UPON A CRYSTALLINE, ZEOLITIC, ALUMINO-SILICATE MOLECULAR SIEVE CRACKING BASE HAVING A SIO2/AL2O3 MOLE-RATIO GREATER THAN ABOUT 3, A RELATIVELY UNIFORM CRYSTAL PORE DIAMETER BETWEEN ABOUT 6 AND 14 A., AND WHEREIN AT LEAST ABOUT 20 PERCENT OF THE ION-EXCHANGE CAPACITY OF SAID MOLECULAR SIEVE CRACKING BASE IS SATISFIED BY HYDROEN IONS; SAID CONTACTING BEING INITIATED AND CONTINUED WITHOUT CATALYST REGENERATION FOR A RUN LENGTH OF AT LEAST ABOUT 3 MONTHS AT TEMPERATURES BETWEEN ABOUT 500* AND 750*F., PRESSURES BETWEEN ABOUT 500 AND 3,000 P.S.I.G., LIQUID HOURLY SPACE BOILING POINT OF THE FEEDSTOCK WHILE PERIODICALLY RAISING THE HYDROCRACKING TEMPERATURES TO MAINTAIN THE DESIRED CONVERSION LEVEL AND COMPENSATE FOR CATALYST DEACTIVATION, AND TERMINATING SAID HYDROCRACKING RUN AT A TEMPERATURE BELOW ABOUT 850*F. BOILING POINT OF THE FEEDSTOCK WHILE PERIODICALLY RAISING THE HYDROCRACKING TEMPRATURES TO MAINTAIN THE DESIRED CONVERSION LEVEL AND COMPENSATE FOR CATALYST DEACTIVATION, AND TERMINATING SAID HYDROCRAKING RUN AT A TEMPERATURE BELOW ABOUT 850*F.