Regeneration method of catalyst for producing aromatic hydrocarbon from organic oxide through catalytic conversion

Abstract

The invention discloses a regeneration method of a catalyst for producing aromatic hydrocarbon from organic oxide through catalytic conversion. The 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 a first oxygen-containing gas to perform first regeneration at 500-650 DEG C 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 a second oxygen-containing gas to perform second regeneration at 600-750 DEG C to obtain the regenerated catalyst and a second regeneration flue gas, and then feeding the regenerated catalyst back into a system of producing the aromatic hydrocarbon from the organic oxide through catalytic conversion, wherein the two regenerators are arranged in an up-and-down manner and the first regenerator is arranged above the second regenerator. Compared with the prior art, the method is safer and is low in hydrothermal deactivation and loss rate of the catalyst.

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 their end products are used in 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, but half of them need to be imported from abroad. [0003] Benzene, toluene and xylene mainly come from the petrochemical industry. The aromatics produced by domestic petrochemical routes account for more than 85% of the total aromatics production. The production technologies mainly include: naphtha ...

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Problems solved by technology

The above-mentioned patents also focus on investigating the influence of different catalyst compositions and the modification of rare metals and rare earth metals on the aromatization process. CN 1880288A and CN 101823929B mainly propose the influence of cyclic aromatization of reaction products on the yield of aromatic hydrocarbons, but these patents have not yet Reaction regeneration system involving organic oxides to aromatics

[0006] Chinese patent CN 101244969A discloses a device and method for continuous aromatization and catalyst regeneration, the device includes an aromatization fluidized bed and a fluidized bed for continuous catalyst regeneration and is arranged between the two fluidized beds The pipeline and solid conveying device used for catalyst transportation, but the patent does not propose the specific form of the regeneration system, and there are some problems: the regenerator only has a gas-solid separation system, and the catalyst recovery rate is low, resulting in expensive catalyst run-off Serious damage; the regenerator type is single-stage bed regeneration. In order to ensure the catalyst regeneration efficiency, the regeneration temperature can reach up to 750°C. Since the coke entrained by the catalyst contains part of hydrogen, water will be generated after combustion. Under the action of high temperature and water vapor, the catalyst The hydrothermal deactivation is serious, which leads to the reduction of catalyst activity; the heat extraction method of the regenerator is internal heat extraction, and only one heat extraction coil is installed. When the coil bursts, a large amount of heat extraction medium enters the regenerator, which will cause pressure on the regenerator. Rise rapidly, and even cause an explosion in severe cases

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