Cracking of reduced crude with the use of inert and catalyst particles

Claim 1

A HEAVY RESIDUAL PETROLEUM OIL CONVERSION PROCESS WHICH COMPRISES COMBINING A PREHEATED RESIDUAL OIL WITH A STEAM OF CATALYTICALLY INERT PARTICLES AT A COKING TEMPERTURE IN A TRANSFER LINE IN THE SUBSTANTIAL ABSENCE OF CATALYST PARTICLES, TO VAPORIZE SAID SOIL AND TO DEPOSIT ASHFORMING AND CATALYST CONTAMINATION CONSTITUENTS OF SAID OIL ON SAID INERT PARTICLES THEREAFTER ADDING TO THE RESULTING SUSPENSION A STREAM OF CATALYST PARTICLES OF SUFFICIENTLY SMALLER PARTICLE SIZE THAN SAID INERT PARTICLES TO GIVE A BASIS FOR SEPARATION OF THE PARTICLES BY ELUTRIATION, THEN INTRODUCING THE SUSPENSION OF OIL VAPORS, CATALYST PARTICLES AND INERT PARTICLES INTO A FLUIDIZED COKING BED MAINTAINED AT A COKING TEMPERATURE IN THE LOWER PORTION OF A REACTION ZONE, SAID COKING BED COMPRISING FROM 1 TO 20% OF SAID CATALYST PARTICLES, ELURTIATING CATALYST PARTICLES FROM SAID COKING BED BY ENTRAINMENT IN OIL VAPORS TO AN UPPER FLUIDIZED CRACKING BED MAINTAINED AT A CRACKING TEMPERATURE IN SAID REACTION ZONE TO COMPLETE THE CONVERSION OF THE OIL, SAID CRACKING BED COMPRISING FROM 95 TO 99% CATALYST PARTICLES, RECOVERING OVERHEAD FROM SAID CRACKING BED VAPOROUS CONVERSION PRODUCTS, REGENERATING CATALYST PARTICLES WITHDRAWN FROM SAID CRACKING BED AND SEPARATELY REHEATING INERT PARTICLES WITHDRAWN FROM SAID COKING BED.