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AssigneesChina Petroleum & Chemical Corporation, Research Institute of Petroleum Processing, Sinopec
InventorsYouhao Xu, Shouye Cui, Zhigang Zhang, Weimin Lu
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The object of the present invention is to provide a catalyst regeneration process which can improve catalyst selectivity. 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 optional steam to carry out a coke combustion reaction, wherein the resultant mixture of the partially regenerated catalyst and flue gas is introduced into a second fluidized bed regenerator and contacted with steam and an optional 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. The inventive processes result in a more uniform distribution of the regenerated catalyst activity; due to the exposure of the catalyst to a low temperature for a long time, a part of the heavy metals are buried by the matrix and the remaining are passivated. Thereby dry gas and coke yields decrease sharply when hydrocarbons are subjected to a catalytic cracking reaction on the regenerated catalyst.
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:
A catalyst regeneration process which improves catalyst selectivity, 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 under the regeneration conditions including a temperature ranging from 550° C. to 750° C., a catalyst average residence time ranging from 4 mins to 30 mins, and a steam:
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