Seed coke production in fluid coking systems

Claim 1

AN IMPROVED HYDROCARBON OIL FLUID COKING PROCESS, COMPRISING INJECTING A CHANGING STOCK INTO A COKING ZONE CONTAINING FLUIDIZED PARTICLES COKE HAVING A SIZE SUBSTANTIALLY IN THE RANGE OF 40 TO 800 MICRONS MAINTAINED AT A COKING TEMPERATURE TO FORM RELATIVELY LIGHTER HYDROCARBON VAPORS AND COKE WHICH IS DEPOSITED ON SAID PARTICULATE COKE CAUSING THE PARTICLES TO GROW IN SIZE, REMOVING SAID VAPORS AS PRODUCT, CIRCULATING STRIPPED COKE PARTICLES FROM THE LOWER PORTION OF SAID COKING ZONE TO A HEATING ZONE WHEREIN THE PARTICLES ARE HEATED TO A TEMPERATURE 50* TO 400*F. ABOVE SAID COKING TEMPERATURE, COMMINUTING THE REHEATED COKE PARTICLES AT A CONVERSION TO MINUS 74 MICRON MATERIAL PER PASS IN THE RANGE OF 1 TO 5% BY IMPELLING ALL OF THE PARTICLES WITHDRAWN FROM THE HEATING ZONE WITHOUT SUBSTANTIAL COOLING BY MEANS OF A HIGH VELOCITY GAS STREAM AGAIST AN IMPACT SURFACE ELUTRIATING THE STILL HOT COMMINUTED PARTICLES UTILIZING THE IMPELLING GAS TO SEPARATE RELATIVELY FINE MINUS 74 MICRON PARTICLES, PASSING THE REMAINING HOT COMMINUTED PARTICLES TO SAID COKING ZONE TO SUPPLY HEAT AND GROWTH NUCLEI THERTO, AND REMOVING SAID RELATIVELY FINE PARTICLES FROM SAID PROCESS AS NET COKE PRODUCT IN AN AMOUNT OF FROM 5 TO 30 WT. PERCENT OF THE HYDROCARBON OIL CHARGING STOCK.