Conversion process and apparatus

Claim 1

A PROCESS FOR EFFECTING CATALYTIC CRACKING OF A GAS OIL WHICH COMPRISES PREHEATING IN A PREHEATING ZONE THE MATERIAL TO BE CONVERTED, ADDING SOLID PARTICULATE CATALYST TO SAID PREHEATED MATERIAL, THE TEMPERATURES AND PROPORTIONS OF SAID CATALYST AND SAID MATERIAL BEING SUCH THAT THE RESULTING COMBINED STREAM OF GAS OIL AND CATALYST HAS A TEMPERATURE WHICH IS SUBSTANTIALLY THE INITIAL TEMPERATURE EMPLOYED IN A SUBSEQUENT CONVERSION ZONE, PASSING SAID COMBINED STREAM ALONG A PETH THROUGH SAID SUBSEQUENT CONVERSION ZONE AND CRACKING SAID GAS OIL THEREIN TO A CONVERSION LOWER THAN ULTIMATELY DESIRED, ADDING HEAT BY RADIATION TO SAID GAS OIL ALONG SAID PATH OF SAID CONVERSION ZONE FROM EXTERNALLY OF SAID PATH, IN QUANTITIES, AND AT POINTS ALONG SAID PATH SUCH THAT TEMPERATURE OF THE CONVERSION IS PROGRESSIVELY INCREASSED DURING ITS FLOW ALONG SAID PATH; THAN IMMEDIATELY WITHDRAWING SAID PARTIALLY CRACKED MATERIAL FROM SAID CONVERSION ZONE AND CONDUCTING SAME, ALONG WITH SAID CATALYST MIXED THEREWITH, TO AN ADIABATIC CONVERSION ZONE OF THE FLUIDIZED BED TYPE AND COMPLETELY SAID CONVERSION THEREIN ADIABATICALLY.