Multiunit catalytic cracking

Claim 1

THE METHOD OF EFFECTING CATALYST CRACKING WITH SOLID CRACKING CATALYST IN SEPARATE CRACKING UNITS EACH OF WHICH CONTAINS ITS RESPECTIVE CRACKING ZONE AND REGENERATION ZONE, WHICH METHOD COMPRISES CONTINUOUSLY CIRCULATING A FIRST CATALYST STREAM IN A FIRST UNIT CYCLE WHICH INCLUDES A FIRST CRACKING ZONE AND A FIRST REGENERATION ZONE AND FROM WHICH THERE IS AN AVERAGE DAILY CATALYST DEPLETION AMOUNTING TO ONLY A FRACTION OF A PER CENT OF THE CATALYST CIRCULATED, CONTINUOUSLY CIRCULATING A SECOND CATALYST STREAM IN A SECOND UNIT CYCLE WHICH INCLUDES A SECOND CRACKING ZONE AND A SECOND REGENERATION ZONE AND FROM WHICH THERE IS AN AVERAGE DAILY CATALYST DEPLETION AMOUNTING TO ONLY A FRACTION OF A PER CENT OF THE CATALYST CIRCULATED, BOTH CYCLES REQUIRING ADDITION OF MAKE-UP CATALYST TO COMPENSATE FOR CATALYST DEPLETION, INTRODUCING INTO THE FIRST CRACKING ZONE A CHARGING STOCK CONTAINING CONTAMINANTS WHICH TEND TO DEACTIVATE THE CATALYST, INTRODUCING INTO SAID SECOND CRACKING ZONE A CHARGING STOCK WHICH IS SUBSTANTIALLY FREE FROM SAID CONTAMINANTS, TRANSFERRING PARTIALLY DEACTIVATED CATALYST FROM SAID FIRST UNIT CYCLE AS MAKE-UP CATALYST TO SAID SECOND UNIT CYCLE DURING THE CONTINUOUS OPERATION THEREOF IN AMOUNTS AT LEAST SUFFICIENT TO COMPENSATE FOR CATALYST DEPLETION IN THE SECOND CYCLE AND INTRODUCING FRESH CATALYST TO THE FIRST UNIT CYCLE IN AMOUNTS SUFFICIENT TO COMPENSATE FOR TOTAL CATALYST DEPLETION IN BOTH OF SAID CYCLES.

Claim 2

THE METHOD OF EFFECTING CATALYST CRACKING WITH SOLID CRACKING CATALYST IN SEPARATE CRACKING UNITS EACH OF WHICH CONTAINS ITS RESPECTIVE CRACKING ZONE AND REGENERATION ZONE, WHICH METHOD COMPRISES CONTINUOUSLY CIRCULATING A FIRST CATALYST STREAM IN A FIRST UNIT CYCLE WHICH INCLUDES A FIRST CRACKING ZONE AND A FIRST REGENERATION ZONE AND FROM WHICH THERE IS AN AVERAGE DAILY CATALYST DEPLETION AMOUNTING TO ONLY A FRACTION OF A PER CENT OF THE CATALYST CIRCULATED, CONTINUOUSLY CIRCULATING A SECOND CATALYST STREAM IN A SECOND UNIT CYCLE WHICH INCLUDES A SECOND CRACKING ZONE AND A SECOND REGENERATION ZONE AND FROM WHICH THERE IS AN AVERAGE DAILY CATALYST DEPLETION AMOUNTING TO ONLY A FRACTION OF A PER CENT OF THE CATALYST CIRCULATED, BOTH CYCLES REQUIRING ADDITION OF MAKE-UP CATALYST TO COMPENSATE FOR CATALYST DEPLETION, INTRODUCING INTO THE FIRST CRACKING ZONE A CHARGING STOCK CONTAINING CONTAMINANTS WHICH TEND TO DEACTIVATE THE CATALYST, INTRODUCING INTO SAID SECOND CRACKING ZONE A CHARGING STOCK WHICH IS SUBSTANTIALLY FREE FROM SAID CONTAMINANTS, TRANSFERRING PARTIALLY DEACTIVATED CATALYST FROM SAID FIRST UNIT CYCLE AS MAKE-UP CATALYST TO SAID SECOND UNIT CYCLE DURING THE CONTINUOUS OPERATION THEREOF IN AMOUNTS AT LEAST SUFFICIENT TO COMPENSATE FOR CATALYST DEPLETION IN THE SECOND CYCLE AND INTRODUCING FRESH CATALYST TO THE FIRST UNIT CYCLE IN AMOUNTS SUFFICIENT TO COMPENSATE FOR TOTAL CATALYST DEPLETION IN BOTH OF SAID CYCLES.