Method for thermal recycle cracking

Claim 2

A PROCESS FOR THE CRACKING OF A RESIDUAL OIL RECOVERED FROM A PROCESS IN WHICH AN OIL HAS BEEN CRACKED TO CONVERT THE SAME INTO HIGHER BOILING AND LOWER BOILING OIL PORTIONS WHICH COMPRISES; OBTAINING A RESIDUAL CRACKED OIL FROM SAID CRACKED OIL, FURTHER CRACKING SAID RESIDUAL CRACKED OIL IN THE PRESENCE OF A BROAD OILING RANGE AROMATIC OIL CONTAINING AROMATIC COMPONENTS OF RELATIVELY HIGH MOLECULAR WEIGHT AND AROMATIC COMPONENTS OF RELATIVELY LOW MOLECULAR WEIGHT UNDER CONDITIONS WHICH IN THE ABSENCE OF SAID AROMATIC OIL WOULD BE COKING CONDITIONS FOR SAID OBTAINED CRACKED RESIDUAL OIL, AND RECOVERING A CRACKED CRACKED RESIDUAL OIL SUBSTANTIALLY MORE AROMATIC THAN SAID OBTAINED RESIDUAL CRACKED OIL, SAID CRACKED CRACKED RESIDUAL OIL CONTAINING COMPONENTS BOILING HIGHER AND COMPONENTS BOILING LOWER THAN SAID OBTAINED CRACKED RESIDUAL OIL.

Claim 3

A PROCESS FOR THE CONVERSION OF A RESIDUAL OIL WHICH COMPRISES; SUBJECTING SAID RESIDUAL OIL TO A THERMAL CRACKING STEP, RECOVERING A FRACTION CONTAINING GASOLINE AND GAS OIL FROM SAID THERMAL CARCKING STEP, PASSING A SECOND FRACTION COMPRISED SUBSTANTIALLY OF A CRACKED RESIDUE FROM SAID THERMAL CARCKING STEP TO A SEVERE THERMAL CARCKING ZONE, ADDING A BROAD BOILING RANGE AROMATIC GAS OIL CONTAINING AROMATIC COMPONENTS OF RELATIVELY HIGH MOLECULAR WEIGHT AND AROMATIC COMPONENTS OF RELATIVELY LOW MOLECULAR WEIGHT TO SAID CRACKED RESIDUE AS A DILUENT THEREFOR, SEVERELY CRACKING SAID CRACKED RESIDUE UNDER CONDITIONS WHICH IN THE ABSENCE OF SAID ADDED AROMATIC GAS WOULD BE COKING CONDITIONS, RECOVERING A FRACTION CONTAINING GASOLINE AND GAS OIL FROM SAID SEVERE CRACKING ZONE, PASSING RESIDUAL FUEL OIL FROM SAID SEVERE CRACKING ZONE TO A VACUUM DISTILLATION ZONE, VACUUM DISTILLING SAID FUEL OIL, RECOVERING AN IMPROVED PETROLEUM PITCH FROM SAID VACUUM DISTILLATION ZONE, RECOVERING A GAS OIL AS OVERHEAD PRODUCT FROM SAID VACUUM DISTILLATION ZONE, SEPARATING SAID OVERHEAD GAS OIL PRODUCT INTO A PORTION OF RELATIVELY LOW MOLECULAR WEIGHT AND A PORTION OF RELATIVELY HIGH MOLECULAR WEIGHT, AND RETURNING SAID PORTION OF RELATIVELY HIGH MOLECULAR WEIGHT TO SAID SEVERE CRACKING ZONE AS A PORTION OF SAID DILUENT THERIN.

Claim 4

A PROCESS FOR THE CONVERSION OF A RESIDUAL OIL WHICH COMPRISES; SUBJECTING SAID RESIDUAL OIL TO A THERMAL CRACKING STEP, RECOVERING A FRACTION CONTAINING GASOLINE AND GAS OIL FROM SAID THERMAL CARCKING STEP, PASSING A SECOND FRACTION COMPRISED SUBSTANTIALLY OF A CRACKED RESIDUE FROM SAID THERMAL CARCKING STEP TO A SEVERE THERMAL CARCKING ZONE, ADDING A BROAD BOILING RANGE AROMATIC GAS OIL CONTAINING AROMATIC COMPONENTS OF RELATIVELY HIGH MOLECULAR WEIGHT AND AROMATIC COMPONENTS OF RELATIVELY LOW MOLECULAR WEIGHT TO SAID CRACKED RESIDUE AS A DILUENT THEREFOR, SEVERELY CRACKING SAID CRACKED RESIDUE UNDER CONDITIONS WHICH IN THE ABSENCE OF SAID ADDED AROMATIC GAS WOULD BE COKING CONDITIONS, RECOVERING A FRACTION CONTAINING GASOLINE AND GAS OIL FROM SAID SEVERE CRACKING ZONE, PASSING RESIDUAL FUEL OIL FROM SAID SEVERE CRACKING ZONE TO A VACUUM DISTILLATION ZONE, VACUUM DISTILLING SAID FUEL OIL, RECOVERING AN IMPROVED PETROLEUM PITCH FROM SAID VACUUM DISTILLATION ZONE, RECOVERING A GAS OIL AS OVERHEAD PRODUCT FROM SAID VACUUM DISTILLATION ZONE, SEPARATING SAID OVERHEAD GAS OIL PRODUCT INTO A PORTION OF RELATIVELY LOW MOLECULAR WEIGHT AND A PORTION OF RELATIVELY HIGH MOLECULAR WEIGHT, AND RETURNING SAID PORTION OF RELATIVELY HIGH MOLECULAR WEIGHT TO SAID SEVERE CRACKING ZONE AS A PORTION OF SAID DILUENT THERIN.