GB667584A - Methods and systems for reactivation and regeneration of solid contact masses containing combustible deposit therein - Google Patents

Abstract

<PICT:0667584/III/1> Hydrocarbon conversion catalyst is regenerated by moving it downwardly as a compact bed in countercurrent to an oxygen-contained regenerating gas through a plurality of combustion zones, the regenerating gas and the gaseous combustion product being separately supplied to and withdrawn from each zone so as to prevent admixture of the gases in adjacent zones. Increased gas pressure obtains in each succeeding combustion zone and the combustion products are discharged from one zone at a pressure substantially equal to that of the regenerating gas entering the immediately preceding zone. As shown, catalyst is treated with steam in hopper 1, then falls through pipe 4 to hydrocarbon conversion zone 2 where it moves in concurrent or countercurrent direction to the reactant vapours, and finally falls through pipe 5 to the regenerator 3 which it leaves at 7 and is returned in a closed system or otherwise by an elevator to the hopper 1. The regenerator is divided into two separate combustion zones in the lower of which regenerating gas enters at 22 through distributer 25 and combustion products leave at 27, and in the upper of which regenerating gas enters at 21 through distributer 23 and combustion products leave at 15. Cooling coils 20, 31 are supplied in the respective zones. Seal gas is fed to the top of the regenerator at 14 and to the top of the reactor at 46 and the difference of pressure between the foot of the elevator and the discharge outlet of the regenerator may be made up by admission of pressure gas through line 39. Differential pressure control means 17, 30 are provided to prevent admixture of gases between the reactor and regenerator and between the different zones of the regenerator.