Process for producing light fuel oil

Claim 1

A METHOD FOR PRODUCING LIGHT FUEL OIL AND LOWER BOILING HYDROCARBONS WHICH COMPRISES: COMBINING A HEAVY CYCLE OIL PRODUCT OF CATALYTIC CRACKING WITH FRESHLY REGENERATED CATALYST PARTICLES TO FORM A SUSPENSION AT A TEMPERATURE IN THE RANGE OF 900*F. TO 1000*F., PASSING THE SUSPENSION UPWARDLY THROUGH A RISER CONVERSION ZONE UNER LIMITED CONVERSION CONDITIONS DESIGNED TO PRODUCE LIGHT FUEL OIL PRODUCT AND DEPOSIT FROM ABOUT 0.5 TO ABOUT 1.2 WEIGHT PERCENT CARBON ON THE SUSPENDED CATALYST PARTICLES, COMBINING A FRESH GAS OIL FEED WITH SAID SUSPENSION OF CARBOND CONTAINING CATALYST AND CYCLE OIL CONVESION PRODUCTS IN AN AMOUNT TO FORM A SECOND SUSPENSION OF REDUCED TEMPERATURE WITHIN THE RANGE OF ABOUT 80/*F. TO ABOUT 900*F., PASSING THE SECOND SUSPENSION THROUGH A RISER CONVERSION ZONE UNDER CONVERSION CONDITIONS SELECTED TO PARTICULARLY PRODUCE LIGHT FUEL OIL PRODUCT, SEPRATING THE HYDROCARBON PRODUCT OF SAID CYCLE OIL AND SAID GAS OIL CONVERSION FROM CATALYST PARTICLES AND THEN INTO HYDROCARBON FRACTIONS COMPRISING GASOLINE AND LOWER BOILING COMPNENTS, A LIGHT FUEL OIL PRODUCT FRACTION, A HEAVY CYCLE OIL PRODUCT FRACTION AND A HIGH BOILING RESIDUAL MATEIAL, AND RECRACKING THE SEPARATED HEAVY CYCLE OIL FRACTION WITH FRESHLY REGENERATED CATALYST AS ABOVE DEFINED.

Claim 2

A METHOD FOR PRODUCING LIGHT FUEL OIL AND LOWER BOILING HYDROCARBONS WHICH COMPRISES: COMBINING A HEAVY CYCLE OIL PRODUCT OF CATALYTIC CRACKING WITH FRESHLY REGENERATED CATALYST PARTICLES TO FORM A SUSPENSION AT A TEMPERATURE IN THE RANGE OF 900*F. TO 1000*F., PASSING THE SUSPENSION UPWARDLY THROUGH A RISER CONVERSION ZONE UNER LIMITED CONVERSION CONDITIONS DESIGNED TO PRODUCE LIGHT FUEL OIL PRODUCT AND DEPOSIT FROM ABOUT 0.5 TO ABOUT 1.2 WEIGHT PERCENT CARBON ON THE SUSPENDED CATALYST PARTICLES, COMBINING A FRESH GAS OIL FEED WITH SAID SUSPENSION OF CARBOND CONTAINING CATALYST AND CYCLE OIL CONVESION PRODUCTS IN AN AMOUNT TO FORM A SECOND SUSPENSION OF REDUCED TEMPERATURE WITHIN THE RANGE OF ABOUT 80/*F. TO ABOUT 900*F., PASSING THE SECOND SUSPENSION THROUGH A RISER CONVERSION ZONE UNDER CONVERSION CONDITIONS SELECTED TO PARTICULARLY PRODUCE LIGHT FUEL OIL PRODUCT, SEPRATING THE HYDROCARBON PRODUCT OF SAID CYCLE OIL AND SAID GAS OIL CONVERSION FROM CATALYST PARTICLES AND THEN INTO HYDROCARBON FRACTIONS COMPRISING GASOLINE AND LOWER BOILING COMPNENTS, A LIGHT FUEL OIL PRODUCT FRACTION, A HEAVY CYCLE OIL PRODUCT FRACTION AND A HIGH BOILING RESIDUAL MATEIAL, AND RECRACKING THE SEPARATED HEAVY CYCLE OIL FRACTION WITH FRESHLY REGENERATED CATALYST AS ABOVE DEFINED.

Claim 3

A method for cracking gas oils and higher boiling material which comprises: initially catalytically cracking a heavy cycle oil product of cracking in a riser conversion zone at a temperature above 900*F. under conversion conditions restricted to limit conversion of the cycle oil charge and deposit from about 0.8 to about 1.2 weight percent carbon on the catalyst, combining a fresh gas oil feed with the cycle oil conversion product containing catalyst with said deposited carbon to form a suspension at a temperature below 900*F. maintained at a contact time within the range of 2 to 4 seconds to restrict conversion of the fresh gas oil feed, separating the suspEnsion into a hydrocarbon phase and a catalyst phase, regenerating the catalyst phase, separating the hydrocarbon phase into desired product fractions comprising a heavy cycle oil and recycling said heavy cycle oil product of cracking as charge for contact with freshly regenerated catalyst in the initial portion of the riser conversion zone.

Claim 4

A method for cracking gas oils and higher boiling material which comprises: initially catalytically cracking a heavy cycle oil product of cracking in a riser conversion zone at a temperature above 900*F. under conversion conditions restricted to limit conversion of the cycle oil charge and deposit from about 0.8 to about 1.2 weight percent carbon on the catalyst, combining a fresh gas oil feed with the cycle oil conversion product containing catalyst with said deposited carbon to form a suspension at a temperature below 900*F. maintained at a contact time within the range of 2 to 4 seconds to restrict conversion of the fresh gas oil feed, separating the suspEnsion into a hydrocarbon phase and a catalyst phase, regenerating the catalyst phase, separating the hydrocarbon phase into desired product fractions comprising a heavy cycle oil and recycling said heavy cycle oil product of cracking as charge for contact with freshly regenerated catalyst in the initial portion of the riser conversion zone.

Claim 5

A method for converting hydrocarbons to gasoline and fuel oil products which comprises: passing a cracking catalyst suspended in a hydrocarbon phase upwardly through a riser conversion zone under decreasing temperature and catalyst activity conditions, the hydrocarbon phase in the lower portion of the riser conversion zone initially limited to a heavy cycle oil product of the conversion operation, the hydrocarbon phase in an upper portion of the riser conversion zone comprising fresh gas oil feed material, restricting conversion of the gas oil feed in the upper portion of the riser conversion zone by limiting the conversion condition to a temperature within the range of 800* to 900*F., separating the product of said riser conversion operation to recover light fuel oil and lower boiling products from higher boiling material comprising heavy cycle oil, and recycling the heavy cycle oil to the lower portion of said riser conversion zone.

Claim 6

A method for converting hydrocarbons to gasoline and fuel oil products which comprises: passing a cracking catalyst suspended in a hydrocarbon phase upwardly through a riser conversion zone under decreasing temperature and catalyst activity conditions, the hydrocarbon phase in the lower portion of the riser conversion zone initially limited to a heavy cycle oil product of the conversion operation, the hydrocarbon phase in an upper portion of the riser conversion zone comprising fresh gas oil feed material, restricting conversion of the gas oil feed in the upper portion of the riser conversion zone by limiting the conversion condition to a temperature within the range of 800* to 900*F., separating the product of said riser conversion operation to recover light fuel oil and lower boiling products from higher boiling material comprising heavy cycle oil, and recycling the heavy cycle oil to the lower portion of said riser conversion zone.