Process for the desulfurization and hydrogenation of a cycle oil

Claim 1

A METHOD FOR HYDROGENATING AND DESULFURIZING A CYCLE OIL FROM THE CRACKING OF PETROLEUM STOCKS, SAID CYCLE OIL BOILING ABOVE 415* F. AND CONTAINING HIGHLY AROMATIC HYDROCARBONS AND FROM 0.5 TO 3.0 WT. PERCENT SULFUR WHICH COMPRISES CONTACTING THE CYCLE OIL IN THE FORM OF A SLURRY FOR ABOUT 10 TO 60 MINUTES WITH A PARTICULATE, PLATINUM CATALYST IN A REACTION ZONE, INTRODUCING SAID CYCLE OIL AND SAID CATALYST WITHIN SAID REACTION ZONE AT RATES ADAPTED TO PROVIDED AT LEAST 1 ATOM OF PLATINUM FOR EVERY 2 ATOMS OF SULFUR, INTRODUCING HYDROGEN WITHIN SAID REACTION ZONE AT A RATE OF BETWEEN 500 AND 1000 S.C.F. PER BARREL OF CYCLE OIL, MAINTAINING THE PRESSURE AND TEMPERATURE WITHIN SAID REACTION ZONE TO RETAIN SAID CYCLE OIL SUBSTANTIALLY IN THE LIQUID PHASE, KEEPING SAID PRESSURE BELOW ABOUT 300 P.S.I.G. AND SAID TEMPERATURE BELOW 700* F., PASSING THE GASEOUS, LIQUID AND SOLID PRODUCTS FROM THE REACTION ZONE TO A SEPARATION ZONE, SEPARATELY WITHDRAWING GASES INCLUDING HYDROGEN AND HYDROGEN SULFIDE, DESULFURIZED LIQUID HYDROCARBON AND SPENT SULFUR-CONTAINING CATALYST FROM SAID SEPARATION ZONE AND CONTACTING THE SPENT CATALYST WITH HYDROGEN IN A REACTIVATION ZONE AT ABOUT 600* TO 1300* F., AND LESS THAN 300 P.S.I.G. FOR 1/3 TO 5 HOURS TO REACTIVATE THE CATALYST.

Claim 2

A METHOD FOR HYDROGENATING AND DESULFURIZING A CYCLE OIL FROM THE CRACKING OF PETROLEUM STOCKS, SAID CYCLE OIL BOILING ABOVE 415* F. AND CONTAINING HIGHLY AROMATIC HYDROCARBONS AND FROM 0.5 TO 3.0 WT. PERCENT SULFUR WHICH COMPRISES CONTACTING THE CYCLE OIL IN THE FORM OF A SLURRY FOR ABOUT 10 TO 60 MINUTES WITH A PARTICULATE, PLATINUM CATALYST IN A REACTION ZONE, INTRODUCING SAID CYCLE OIL AND SAID CATALYST WITHIN SAID REACTION ZONE AT RATES ADAPTED TO PROVIDED AT LEAST 1 ATOM OF PLATINUM FOR EVERY 2 ATOMS OF SULFUR, INTRODUCING HYDROGEN WITHIN SAID REACTION ZONE AT A RATE OF BETWEEN 500 AND 1000 S.C.F. PER BARREL OF CYCLE OIL, MAINTAINING THE PRESSURE AND TEMPERATURE WITHIN SAID REACTION ZONE TO RETAIN SAID CYCLE OIL SUBSTANTIALLY IN THE LIQUID PHASE, KEEPING SAID PRESSURE BELOW ABOUT 300 P.S.I.G. AND SAID TEMPERATURE BELOW 700* F., PASSING THE GASEOUS, LIQUID AND SOLID PRODUCTS FROM THE REACTION ZONE TO A SEPARATION ZONE, SEPARATELY WITHDRAWING GASES INCLUDING HYDROGEN AND HYDROGEN SULFIDE, DESULFURIZED LIQUID HYDROCARBON AND SPENT SULFUR-CONTAINING CATALYST FROM SAID SEPARATION ZONE AND CONTACTING THE SPENT CATALYST WITH HYDROGEN IN A REACTIVATION ZONE AT ABOUT 600* TO 1300* F., AND LESS THAN 300 P.S.I.G. FOR 1/3 TO 5 HOURS TO REACTIVATE THE CATALYST.