Fluid coking process

Claim 1

A PROCESS FOR UPGRADING HEAVY PETROLEUM OILS TO OBTAIN MAXIMUM QUANTITIES OF LIGHT AND MIDDLE DISTALLATES WITH A MINIMUM OF DEGRADATION PRODUCTS, COMPRISING INCONTAINING A FLUIDIZED BED OF PARTICULATE COKE MAINTAINED AT A COKING TEMPERATURE IN THE RANGE OF 950* TO 1200*F., WHEREBY SAID HIGH BOILING PETROLEUM OIL IS PYROLYTICALLY UPGRADED DEPOSITING CARBONACEOUS RESIDUE ON SAID PARTICULATE COKE AND EVOLING RELATIVELY LIGHTER HYDROCARBON VAPORS, WITHDRAWING AND SEPARATING FROM SAID RELATIVELY LIGHTER HYDROCARBON VAPORS, PRODUCTS HAVING AN END BOILING POINT IN THE RANGE OF 600* TO 950*F., AND INTERMEIDATE HEAVY DISTILLATE FRACTION BOILING ABOVE SAID END BOILING POINT AND RESIDUE BOILING ABOVE A TEMPERATURE IN THE RANGE OF 950* TO 1150*F., RECYLING SAID RESIDUE TO SAID COKINH ZONE FOR FURTHER TREATMENT THEREIN, INJECTIN SAID HEAVY DISTILLATE FRACTION INTO A MILDER THERMAL CRACKING ZONE CONTAINING ANOTHER FLUIDIZED BED OF PARTICULATE COKE MAINTAINED AT A THERMAL CRACKING TEMPERATURE IN THE RANGE OF 600* TO 850*F., WHEREBY SAID HEAVY DISTILLATE FRACTION IS CONVERTED PREDOMINANTLY IN LIQUID DISTILLATE FRACTION LOWER BOILING HYDROCARBONS, RECOVERING SAID RELATIVELY LOW BOILING HYDROCARBONS, AND CIRCULATING PORTIONS OF THE FLUDIZED COKE IN SAID COKING AND THERMAL CRACKING ZONE TO AN EXTERNAL HEATING ZONE AND BACK TO MAINTAIN SAID COKING AND THERMAL TERMPERATURES.