Modified fluid coking process

Claim 1

IN A PROCESS FOR RECOVERING OIL FROM FROTH OBTAINED FROM TAR SAND AND COMPRISING A MIXTURE OF OIL, WATER AND MINERAL SOLIDS, THE STEPS WHICH COMPRISE INTRODUCING SAID FROTH INTO A LOW SEVERITY COKING ZONE WHEREIN IT IS CONTACTED WITH A FLUIDIZED DENSE TURBULENT BED OF HOT COKE-CONTAINING MINERAL SOLID PARTICLES TO REMOVE WATER AND OIL AND TO CONVERT THE OIL TO LOWER BOILING HYDROCARBONS, FRACTIONATING THE HYDROCARBONS INTO A LIGHT STREAM BOILING UP TO ABOUT 500*F., A MIDDLE BOILING STREAM BOILING BETWEEN ABOUT 400 AND 950*F. AND A HEAVY 950* F.+ FRACTION, PASSING SAID HEAVY FRACTION TO A SECOND FLUID COKING UNIT TO PRODUCE GAS AND LIQUID HYDROCARBON PRODUCTS AND A HIGH VALUE COKE, DEPOSITING COKE ON THE SAID MINERAL SOLID PARTICLES IN SAID FIRST COKING ZONE, REMOVING A PORTION OF THE SAID COKE-CONTAINING MINERAL SOLID PARTICLES AND PASSING THEM TO A FIRST BURNING ZONE TO INCREASE THE TEMPERATURE OF THE SAID MINERAL SOLID PARTICLES, ADDING SUPPLEMENTARY FUEL TO SAID FIRST BURNING ZONE SO THAT BETWEEN ABOUT 5 TO 50% OF THE COKE ON SAID COKE-CONTAINING MINERAL SOLIDS REMAINS UNBURNED, PASSING A PORTION OF SAID HEATED COKE-CONTAINING MINERAL PARTICLES BACK TO SAID FIRST COKING ZONE, PASSING ANOTHER PORTION OF SAID HEATED COKE-CONTAINING MINERAL PARTICLES FROM SAID FIRST BURNING ZONE TO A HIGH TEMPERATURE SHORT TIME SECOND BURNER ZONE MAINTAINED AT A HIGHER TEMPERATURE BETWEEN ABOUT 1500 TO 3000*F. TO BURN SUBSTANTIALLY ALL THE SAID COKE ON SAID COKE-CONTAINING MINERAL PARTICLES TO CARBON DIOXIDE TO PRODUCE HOT FLUE GAS AND HOT MINERAL SOLIDS, REMOVING SAID HOT FLUE GAS OVERHEAD AND RECOVERING HEAT THEREFROM, PASSING SAID HOT MINERAL SOLIDS TO A COOLING ZONE TO RECOVER HEAT THEREFROM AND THEN DISCARDING SAID COOLED MINERAL SOLIDS.