Patent ID: 8791038
Filing Date: 2014-07-29
Classification: B01J,C10G

Abstract:
1. A catalyst regeneration process which improves catalyst selectivity, characterized in that a spent catalyst from a reactor is introduced into a first fluidized bed regenerator and contacted with an oxygen-containing gas stream and optional steam to carry out a coke combustion reaction under the regeneration conditions including a temperature ranging from 550° C. to 750° C., a catalyst average residence time ranging from 0.5 min to 6 mins, and a steam: oxygen-containing gas stream ratio by weight ranging from 0 to 0.1, wherein a mixture of the resultant partially regenerated catalyst and flue gas is introduced into a second fluidized bed regenerator and contacted with steam and an oxygen-containing gas stream to carry out a further regeneration reaction under the regeneration conditions including a temperature ranging from 550° C. to 700° C., a catalyst average residence time ranging from 3 mins to 30 mins, and an oxygen-containing gas stream: steam ratio by weight ranging from greater than 0 to 500, wherein the steam and the oxygen-containing gas stream are introduced into the second fluidized bed separately from the partially regenerated catalyst and the flue gas, and then the regenerated catalyst is introduced into the reactor.