Catalyst regeneration zone divided into sectors for regenerative catalytic units

A process for the regeneration of a coked catalyst moving in moving bed mode, comprising at least one zone for the combustion of coke deposited on the catalyst, said combustion zone having an annular shape and being divided into at least two combustion stages, each stage being divided into a number N of radial sectors, wherein N is in the range of 2 to 4, which are substantially equal, the catalyst flowing under gravity from one sector of the first combustion stage to the sector in vertical alignment of the second combustion stage by drop legs, and the movement of combustion gas being substantially perpendicular to that of the catalyst, and such that the combustion gas passes in succession through all of the sectors of the first combustion stage, then through all of the sectors of the second combustion stage in the following order,

• in which the number of sectors is 4 at each stage of the combustion zone, and by numbering the sectors of the first stage 1,2,3,4 and the facing sectors of the second stage 1′,2′,3′,4′, the fuel gas follows the circuit 1,2,3,4,4′,3′,2′,1′, or
• in which the number of sectors is 2 at each stage of the combustion zone, and by numbering the sectors of the first stage 1, 2 and the facing sectors of the second stage 1′,2′, the fuel gas follows the circuit 1,2,2′,1′,
• the molar flow rate of fuel having the same first value for all of the sectors of the first stage, said first value allowing the combustion of a quantity of coke in the range 50% to 90% of the total coke deposited on the catalyst and a second value, distinct from the preceding value, for all of the sectors of the second combustion stage, said second value allowing complete combustion of residual coke with an excess of oxygen in the fuel gas in the range 0.1% to 0.5%, the inlet temperature for all of the sectors of the first stage of the combustion zone being in the range 460° C. to 490° C. and the inlet temperature for all of the sectors of the second stage of the combustion zone being in the range 470° C. to 510° C.