Fluid coking

Claim 1

IN A PROCESS WHEREIN HIGH BOILING HYDROCARBONS ARE THERMALLY CRACKED IN A FLUID COKING PROCESS AND COKE PARTICLES ARE CIRCULATED BETWEEN A COKING ZONE AND A COKE BURNING ZONE TO PARTIALLY BURN THE COKE PARTICLES TO SUPPLY HEAT DRAWN FROM SAID BURNING ZONE AND WHEREIN COKE FINES ARE SEPARATED FROM ADMIXTURE WITH COARSE COKE PARATICLES AND THE COKE FINES ARE RETURNEDTO SAID BURNING ZONE AND COARSE COKE PARATICLES ARE WITHDRAWN AS PRODUCT COKE, THE IMPROVEMENT WHICH COMPRISES WITHDRAWING A PORTION OF THE COKE MIXTURE FROM SAID BURNING ZONE AND PASSING IT TO THE UPPER PORTION OF A VERTICALLY ARRANGED CENTRAL CONFINED ELUTRIATING PASSAGEWAY SURROUNDED BY AN ANNULAR CHAMBER, SAID ELUTRIATING PASSAGEWAY AND SAID ANNULAR CHAMBER COMMUNICATING AT THE BOTTOM TO FORM A QUENCHING ZONE, INTRODUCING SAID MIXTURE OF COKE FINES AND COARSE COKE PARTICLES INTO THE UPPER PORTION OF SAID CENTRAL CONFINED ELUTRIATING PASSAGEWAY, ELUTRIATING COKE FINES FROM SAID COKE MIXTURE BY THE COUTERCURRENT ACTION OF UPFLOWING STEAM INTRODUCED AS A SEPARATELY CONTROLLED STREAM INTO THE LOWER PORTION OF SAID CONFINED ELONGATED ELUTRIATING PASSAGEWAY TO SEPARATE COKE FINES OVERHEAD FROM COARSE COKE PARTICLES, PASSING THE SEPARATED COARSE COKE PARTICLES INTO SAID QUENCHING ZONE, INJECTING WATER INTO SAID COARSE COKE PARTICLES AND FORM STEAM WHICH PASSES UPWARDLY THROUGH SAID ANNULAR ZONE AND WHICH ENTRAINS COKE FINES FROM THE COARSE COKE PARTICLES, COMBINING THE LAST MENTIONED STEAM CONTAINING ENTRAINED COKE FINES WITH THE STEAM AND COKE FINES LEAVING SAID CENTRAL CONFINED ELONGATED ELUTRIATING ZONE OVERHEAD AND PASSING THE COMBINED STREAM TO SAID BURNER ZONE AND REMOVING COARSE COKE PARTICLES AS PRODUCT COKE FROM SAID QUENCHING ZONE.