A kind of regeneration method of organic oxide catalytic conversion to aromatics catalyst

Abstract

The invention discloses a regeneration method of a catalyst for producing aromatic hydrocarbon from an organic oxide through catalytic conversion. The regeneration method includes the steps of: 1) feeding a to-be-regenerated catalyst from a system of producing the aromatic hydrocarbon from the organic oxide through the catalytic conversion to a first regenerator to contact the catalyst with first regenerator oxygen-poor main air to perform first regeneration to obtain a semi-regenerated catalyst and a first regeneration flue gas; and 2) feeding the semi-regenerated catalyst to a second regenerator to contact the catalyst with second regenerator oxygen-poor main air to perform second regeneration. On the basis of volume, the content of oxygen in the first regenerator oxygen-poor main air and the second regenerator oxygen-poor main air are both lower than the content of oxygen in air. Compared with a regeneration method in the prior art, the regeneration method effectively increases the volume of the regenerators and ensures coking time and coking effect of the to-be-regenerated catalyst. The method also adapts different treatment load and coking load in reactors.

Description

technical field [0001] The invention relates to a regeneration method of a catalyst for producing aromatic hydrocarbons by catalytic conversion of organic oxides. Background technique [0002] Aromatics is an important organic chemical basic raw material, among which benzene, toluene and xylene (including o-xylene, m-xylene and p-xylene) are widely used, and the applications of its end products include synthetic resin, synthetic fiber, synthetic rubber , coatings, dyes and pharmaceuticals and other fields. With the development of my country's economy and society, the demand for aromatics is also increasing. At present, the annual consumption of aromatics in my country exceeds 20 million tons, and half of them need to be imported from abroad. [0003] Benzene, toluene and xylene mainly come from the petrochemical industry. Domestic petrochemical routes produce aromatics accounting for more than 85% of the total aromatics production. Production technologies mainly include: na...

AI Technical Summary

Problems solved by technology

[0007] Due to the low amount of regenerated flue gas, in order to maintain the fluidized state of the catalyst in the regenerator, the diameter of the regenerator is only 1 / 4 to 1 / 3 of the reactor diameter; on the other hand, the characteristics of the coke produced by catalytic conversion of organic oxides to aromatics determine In addition, the spent catalyst must have enough residence time to completely burn off the coke entrained by the spent catalyst, which requires that the volume of the regenerator must be large enough; thus, the regenerator may be thin and long, and the height of the dense bed is very high. High, resulting in the increase of the outlet pressure of the main air for coking, difficulties in the facade layout of reactors and regenerators, etc.

Images