Two stage fluidized catalytic conversion system with multiple stripping zones

Claim 1

A CATALYTIC CRACKING PROCESS WHICH COMPRISES PASSING A VAPOROUS HYDROCARBON MATERIAL AND FINELY DIVIDED FLUIDIZED CATALYST UPWARDLY THROUGH A FIRST REACTION ZONE UNDER CRACKING CONDITIONS WHEREBY THE CATALYST BECOMES CONTAMINATED WITH CARBONACEOUS DEPOSITS, SEP ARATING CATALYST FROM PRODUCTS OF REACTION IN THE UPPER PORTION OF SAID FIRST REACTION ZONE, TRANSFERRING SAID SEPARATED CATALYST FROM THE UPPER PORTION OF SAID FIRST REACTION ZONE TO THE UPPER PORTION OF A DENSE FLUIDIZED BED OF CRACKING CATALYST IN A SECOND REACTION ZONE ADJACENT TO SAID FIRST REACTION ZONE AND IN OPEN COMMUNICATION WITH ONE ANOTHER IN THE UPPER PORTION THEREOF, PASSING A VAPOROUS HYDROCARBON UPWARDLY THROUGH SAID DENSE FLUIDIZED BED OF CATALYST IN SAID SECOND REACTION ZONE UNDER CONVERSION CONDITIONS WHEREBY THE CATALYST BECOMES SPENT DUE TO CARBONACEOUS DEPOSITS THEREON, WITHDRAWING SPENT CATALYST FROM SAID DENSE FLUIDIZED BED AND PASSING THE SAME DOWNWARDLY THROUGH A FIRST STRIPPING ZONE, PARTIALLY STRIPPING THE CATALYST IN SAID FIRST STRIPPING ZONE, PASSING PARTIALLY STRIPPED CATALYST FROM THE LOWER PORTION OF SAID FIRST STRIPPING ZONE UPWARDLY AS A SUSPENSION IN A GASEOUS MATERIAL THROUGH AN ELONGATED CONFIRNED SECOND STRIPPING ZONE TO A THIRD STRIPPING ZONE, STRIPPING CATALYST IN SAID THIRD STRIPPING ZONE IN A DENSE FLUIDIZED CONDITION, PASSING STRIPPED CATALYST FROM SAID THIRD STRIPPING ZONE SUBSTANTIALLY VERTICALLY DOWNWARDLY AS A CONFINED STREAM INTO A REGENERATION ZONE, REGENERATING THE CATALYST IN SAID REGENERATION ZONE, PASSING REGENERATED CATALYST FROM THE LOWER PORTION OF SAID REGENERATION ZONE SUBSTANTIALLY VERTICALLY DOWNWARDLY AS A CONFINED STREAM THROUGH SAID FIRST REACTION ZONE TO THE LOWER PORTION THEREOF AND RECOVERING A MIXTURE OF CRACKED PRODUCTS FROM THE FIRST AND SECOND REACTION ZONES AS A PRODUCT OF THE PROCESS.