It is the catalytic converter regenerative manner which improves the catalytic converter regenerative

摘要

PROBLEM TO BE SOLVED: To provide a catalyst regeneration process which can improve catalyst selectivity.;SOLUTION: A first aspect of the invention is 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 optionally introduced steam to carry out a coke combustion reaction, the mixture of the partially regenerated catalyst and flue gas generated as a result is introduced into a second fluidized bed regenerator and contacted with steam and an optionally introduced oxygen-containing gas stream to carry out a further regeneration reaction, and then the regenerated catalyst is introduced into the reactor. A second aspect of the invention is characterized in that a spent catalyst from a reactor is introduced into a fluidized dense bed regenerator and contacted with an oxygen-containing gas stream and steam to carry out a coke combustion reaction, and then the regenerated catalyst is introduced into the reactor. By the processes, the distribution of regenerated catalyst activity is made more uniform, and due to the exposure of the catalyst to a low temperature for a long time, a part of heavy metals is buried by a matrix and the remaining are passivated.;COPYRIGHT: (C)2011,JPO&INPIT