Temperature control for transfer line reactors

Claim 1

IN A PROCESS OF CONVERTING A HEAVY HYDROCARBON OIL TO COKE AND LOWER BOILING MATERIALS INCLUDING LOW MOLECULAR WEIGHT NORMALLY GASEOUS UNSATURATED HYDROCARBONS BY CONTACTING THE HEAVY HYDROCARBON OIL WITH A DISPERSED SUSPENSION OF HOT PARTICULATE SOLIDS IN A ONE-STAGE TRANSFER LINE REACTION ZONE FOR A RELATIVELY SHORT TIME AT A HIGH TEMPERATURE, RECOVERING THE SOLIDS AND CIRCULATING THE SOLIDS TO AN EXTERNAL HEATING ZONE TO INCREASE THEIR TEMPERATURE AND RETURNING HEATED SOLIDS TO THE TRANSFER LINE REACTION ZONE SUBJECT TO POSITIVE CONTROL TO A SLIDE VALVE, THE IMPROVEMENT WHICH COMPRISES SEPARATING SOLIDS FROM GASEOUS PRODUCTS LEAVING SAID TRANSFER LINE REACTION ZONE AND DISCHARGING THE SO SEPARATED SOLIDS DIRECTLY INTO A SOAKING ZONE WHEREIN THEY ARE MAINTAINED IN THE FORM OF A DENSE TURBULENT FLUIDIZED BED BEFORE BEING RETURNED TO SAID EXTERNAL HEATING ZONE, DETERMINING THE TEMPERATURE OF THE SOLIDS IN SAID DENSE TURBULENT FLUIDIZED BED TO OBTAIN AN INDICATION OF THE TEMPERATURE IN SAID TRANSFER LINE REACTION ZONE AND CONTROLLING THE HOT SOLIDS FLOW TO SAID TRANSFER LINE REACTION ZONE BY THE SLIDE VALVE IN RESPONSE TO THE TEMPERATURE DETERMINATION TO MAINTAIN THE DESIRED TEMPERATURE IN SAID TRANSFER LINE REACTION ZONE.