Stripping of oil from spent cracking catalyst

Claim 1

IN THE FLUID CATALYST PROCESS FOR THE CONVERSION OF HYDROCARBONS WHEREIN A FINELY DIVIDED CATALYST SUSPENDED IN CHARGE OIL IS PASSED TO A REACTION ZONE, SPENT CATALYST FROM THE REACTION ZONE IS STRIPPED OF OIL, REGENERATED CATALYST ING THE CATALYST, AND THE REGENERATED CATALYST RETURNED TO THE REACTION ZONE, THE IMPROVEMENT WHICH COMPRISES STRIPPING THE OIL FROM THE SPENT CATALYST BY PASSING THE CATALYST DOWNWARDLY THROUGH AN ENCLOSED VERTICAL ELONGATED STRIPPING CHAMBER CONSISTING OF A PLURALITY OF SUCCESSIVE COMMUNICATING ZONES, PASSING THE CATALYST FROM EACH ZONE, EXCEPT THE LOWERMOST ZONE, TO A LOWER ZONE AS A DENSE PHASE FLUDIZED BODY, RESUSPENDING THE CATALYST AS IT ENTERS EACH LOWER ZONE IN A CURRENT OF FRESH STEAM DIRECTED TRANSVERSELY ACROSS THE STREAM OF CATALYST AS IT ENTERS SAID LOWER ZONE, RETURNING A PORTION OF THE CATALYST IN SUSPENSION IN THE STEAM IN THE FORM OF A PLURALITY OF DIVIDED CATALYST STREAMS TO A HIGHER ZONE AND WITHDRAWING STRIPPED CATALYST FROM THE LOWERMOST ZONE OF THE STRIPPED CHAMBER.