Regeneration method of dehydrogenating catalyst of alkyl benzene

Abstract

The invention relates to an in-reactor generative method of an alkyl benzene dehydrogenation catalyst, and mainly solves the problems that the in-reactor generative method of alkyl benzene dehydrogenation catalyst in the unsaturated aromatic hydrocarbon production method is not related in the former documents or the generative method introduced in the former document is poor in the generative effect, therefore the prolonging of the service life of the catalyst, the reaction transformation ratio and the reaction yield coefficient are influenced, and the long down time of the device caused by the catalyst replacement influences the output of the device. The method better solves the problems by adopting the technical proposal that firstly the catalyst is swept by superheated steam at 350 to 600 DEG C and then swept by the gas mixture of air and aqueous vapor, then the amount of the aqueous vapor is gradually reduced while the amount of the air is increased, and the generation is performed to the dehydrogenation catalyst in a reactor. The method can be applied to the industrial production for preparing the unsaturated aromatic hydrocarbon by performing dehydrogenation to alkyl aromatics.

Description

technical field [0001] The invention relates to an in-vessel regeneration method for an alkylbenzene dehydrogenation catalyst, in particular to an in-vessel regeneration method for an alkylethylbenzene dehydrogenation, cumene dehydrogenation or dialkylbenzene dehydrogenation catalyst. Background technique [0002] The production of alkenylbenzene is well known in terms of the dehydrogenation process and the various catalysts used in the process. The main research objective at present is to improve the efficiency of this process. Especially known is the dehydrogenation process of alkylbenzenes, wherein the dehydrogenation is carried out in a set comprising at least two dehydrogenation reactors in series and placed between the reactors, wherein the reaction effluent is heat exchanged with steam to Carried out in a heated heating device. According to this process, steam is first used to heat the reaction effluent, which is then mixed with the alkylbenzene at the inlet of the ...