Fluid hydroforming with catalyst recycle

Claim 1

IN AN ENDOTHERMIC PROCESS FOR THE CONVERSION OF A HYDROCARBON CHARGING STOCK OF THE NAPHTHA BOILING RANGE IN THE PRESENCE OF HYDROGEN BY MEANS OF FLUIDIZED SOLIDS CONVERSION CATALYST IN A HIGH PRESSURE ZONE WHICH IS SO NARROW IN CROSS SECTIONAL AREA WITH RESPECT TO ITS HEIGHT THAT THE UPPER PART OF SAID ZONE TENDS TO BE COOLER THAN THE LOWER PART BECAUSE OF THE ENDOTHERMIC NATURE OF THE PROCESS, THE IMPROVED METHOD OF OPERATION WHICH COMPRISES SUPPLYING HEAT TO THE LOWER PART OF SAID ZONE BY INTRODUCING THERETO A STREAM OF HYDROGEN WHICH HAS BEEN SUPERHEATED TO A TEMPERTURE ABOVE 1000* F., WITHDRAWING DENSE PHASE FLUIDIZED CATALYST DIRECTLY FROM AN INTERMEDIATE LEVEL IN THE REACTION ZONE, SUSPENDING SAID WITHDRAWN CATALYST IN A HOT OXYGEN-FREE GAS OF THE CLASS CONSISTING OF FLUE GAS, HYDROGEN AND MIXTURES THEREOF AT A HIGHER TEMPERATURE THAN THE TEMPERATURE OF THE WITHDRAWN CATALYST, CONVEYING SAID WITHDRAWN CATALYST TO A HIGHER ELEVATION THAN THE REACTION ZONE BY MEANS OF SAID HOT OXYGEN-FREE GAS, SEPARATING SAID HOT OXYGEN-FREE GAS FROM CATALYST WHICH HAS BEEN HEATED THEREBY AND RETURNING THE HEATED CATALYST, TO THE UPPER PART OF SAID ZONE.