Method for producing light fuel oil

Claim 1

A METHOD FOR PRODUCING LIGHT CYCLE OIL FROM HIGHER BOILING HYDROCARBON FEED MATERIALS WHICH COMPRISES, PASSING A RELATIVELY HIGH BOILING HYDROCARBON FEED MATERIAL WITH A CRACKING CATALYST OF LIMITED ACTIVITY THROUGH A FIRST CONVERSION ZONE MAINTAINED UNDER CONDITIONS TO LIMIT CONVERSION OF THE HYDROCARBON FEED TO GASOLINE AND LOWER BOILING PRODUCTS, RECOVERING A HYDROCARBON PHASE FROM SAID FIRST CONVERSION ZONE AND SEPARATING IN A FRACTIONATION ZONE SAID HYDROCARBON PHASE INTO A DESIRED LIGHT FUEL OIL PRODUCT, AN INTERMEDIATE CYCLE OIL PRODUCT AND A HIGHER BOILING CYCLE OIL PRODUCT, PASSING SAID HIGHER BOILING CYCLE OIL PRODUCT TO SAID FIRST CONVERSION ZONE, PASSING SAID INTERMEDIATE CYCLE OIL PRODUCT TO A SECOND CONVERSION ZONE FOR CONTACT WITH A CRACKING CATALYST OF LIMITED ACTIVITY UNDER LIMITED CONVERSION CONDITIONS PARTICULARLY SELECTED TO PRODUCE LIGHT FUEL OIL PRODUCT, AND RECOVERING SAID LIGHT FUEL OIL PRODUCT IN SAID FRACTIONATION ZONE, PASSING CATALYST SEPARATED FROM SAID SECOND CONVERSION ZONE TO SAID FIRST CONVERSION ZONE, AND REDUCING THE POUR POINT OF SAID LIGHT OIL PRODUCT RECOVERED FROM SAID CONVERSION OPERATIONS BY CONTACT WITH A ZSM-5 TYPE OF CRYSTALLINE ZEOLITE.

Claim 2

A METHOD FOR PRODUCING LIGHT CYCLE OIL FROM HIGHER BOILING HYDROCARBON FEED MATERIALS WHICH COMPRISES, PASSING A RELATIVELY HIGH BOILING HYDROCARBON FEED MATERIAL WITH A CRACKING CATALYST OF LIMITED ACTIVITY THROUGH A FIRST CONVERSION ZONE MAINTAINED UNDER CONDITIONS TO LIMIT CONVERSION OF THE HYDROCARBON FEED TO GASOLINE AND LOWER BOILING PRODUCTS, RECOVERING A HYDROCARBON PHASE FROM SAID FIRST CONVERSION ZONE AND SEPARATING IN A FRACTIONATION ZONE SAID HYDROCARBON PHASE INTO A DESIRED LIGHT FUEL OIL PRODUCT, AN INTERMEDIATE CYCLE OIL PRODUCT AND A HIGHER BOILING CYCLE OIL PRODUCT, PASSING SAID HIGHER BOILING CYCLE OIL PRODUCT TO SAID FIRST CONVERSION ZONE, PASSING SAID INTERMEDIATE CYCLE OIL PRODUCT TO A SECOND CONVERSION ZONE FOR CONTACT WITH A CRACKING CATALYST OF LIMITED ACTIVITY UNDER LIMITED CONVERSION CONDITIONS PARTICULARLY SELECTED TO PRODUCE LIGHT FUEL OIL PRODUCT, AND RECOVERING SAID LIGHT FUEL OIL PRODUCT IN SAID FRACTIONATION ZONE, PASSING CATALYST SEPARATED FROM SAID SECOND CONVERSION ZONE TO SAID FIRST CONVERSION ZONE, AND REDUCING THE POUR POINT OF SAID LIGHT OIL PRODUCT RECOVERED FROM SAID CONVERSION OPERATIONS BY CONTACT WITH A ZSM-5 TYPE OF CRYSTALLINE ZEOLITE.

Claim 11

A method for producing light fuel oil product of desired pour point which comprises, separating an intermediate cycle oil product of cracking higher boiling than desired fuel oil product obtained as hereinafter defined, recracking said separated intermediate cycle oil product in a first riser cracking operation in the presence of freshly regenerated catalyst of restricted activity under conditions selected to restrict conversion thereof to less than 30 vol. percent, separating the product of said recracking operation to recover a hydrocarbon phase from a first catalyst phase and passing said hydrocarbon phase to a product fractionation zone, passing catalyst from said first catalyst phase to a second riser conversion zone, passing freshly regenerated catalyst along with fresh gas oil feed and heavy cycle oil product of cracking to said second riser cracking zone, effecting cracking of the hydrocarbon feed passed to said second riser cracking operation under conversion condition restricted to less than about 40 vol. percent, separating the product of said second riser cracking operation into a hydrocarbon phase and a second catalyst phase, passing the hydrocarbon phase to said product fractionation zone, and reducing the pour point of a light cycle oil separated from the product of cracking operation by contacting a ZSM-5 type of crystalline zeolite under selected conversion conditions.

Claim 12

A method for producing light fuel oil product of desired pour point which comprises, separating an intermediate cycle oil product of cracking higher boiling than desired fuel oil product obtained as hereinafter defined, recracking said separated intermediate cycle oil product in a first riser cracking operation in the presence of freshly regenerated catalyst of restricted activity under conditions selected to restrict conversion thereof to less than 30 vol. percent, separating the product of said recracking operation to recover a hydrocarbon phase from a first catalyst phase and passing said hydrocarbon phase to a product fractionation zone, passing catalyst from said first catalyst phase to a second riser conversion zone, passing freshly regenerated catalyst along with fresh gas oil feed and heavy cycle oil product of cracking to said second riser cracking zone, effecting cracking of the hydrocarbon feed passed to said second riser cracking operation under conversion condition restricted to less than about 40 vol. percent, separating the product of said second riser cracking operation into a hydrocarbon phase and a second catalyst phase, passing the hydrocarbon phase to said product fractionation zone, and reducing the pour point of a light cycle oil separated from the product of cracking operation by contacting a ZSM-5 type of crystalline zeolite under selected conversion conditions.