Combustion with fluidization and after-burning

Claim 1

IN THE PROCESS OF REGENERATING SPENT, FINELY DIVIDED METAL OXIDE CRACKING CATALYST BEARING CARBONACEOUS DEPOSITS WHERIN SAID SPENT CATALYST IS CONTINOUSLY ADMITTED INTO A CLOSED FLUIDIZATION-COMBUSTION ZONE, FLUIDIZING-COMBUSITO AIR IS CONTINUOUSLY FLOWED UPWARDLY THROUGH SAID CATALYST TO FORM A FLUIDIZED BED, SAID CARBONACEOUS DEPOSTIS ARE BURNED TO PRODUCE AN EXIT GAS WHICH IS DISCHARGED FROM THE TOP OF SAID BED AND CONTAINS ENTRAINED CATALYST, CARBON DIOXIDE AND CARBON MONOXIDE, SAID EXIT GAS BEING INCAPABLE OF SELF-SUSTAINED COMBUSTION AT THE EXIT TEMPERATURE WHEN MIXED WITH SUPPLEMENTAL AIR, AND REGENERATED CATALYST IS CONTINUOUSLY DISCHARED FROM SAID ZONE, THE IMPROVEMENT OF RECOVERING HEAT AND WORK ENERGY FROM SAID EXIT GAS SUFFICIENT TO SUPPLY THE SAID FLUIDIZING-COMBUSTION AIR BY A COMBINATION OF STEPS WHICH INCLUDES: MAINTAINING SAID DLUIDIZATION-COMBUSTION ZONE AT A SUBSTANTIAL SUPERATOMSPHERIC PRESSURE SUFFICIENT TO PERMIT EXPANSION OF THE EXIT GAS IN A GAS TURBIN, SUBSTANTIALLY SEPARATING SAID ENTRAINED CATALYST FROM THE EXIT GAS BY INERTIA WITHOUT SUBSTANTIALLY LOWERING THE EXIT GAS TEMPERATURE, MIXING THE RESULTING CLEAN GAS WITH SUPPLE-