Method of producing aromatic hydrocarbon through catalytic conversion of organic oxides

Abstract

The invention discloses a method of producing aromatic hydrocarbon through catalytic conversion of organic oxides. The method includes the steps of: a) contacting the organic oxides in a dense-phase bed reaction section with a regenerated catalyst from a second regenerator to perform an aromatization reaction; b) discharging the reaction product from a reactor dilute-phase section, wherein to-be-regenerated catalyst successively passes through a first regenerator and the regenerator and then is fed back to the reactor for the reaction. The method has safe and stable process, achieves continuous operation, reduces usage amount of oxygen-containing gas for coking, catalyst loss and hydrothermal deactivation, is low in operation cost and has low environment pollution.

Description

technical field [0001] The invention relates to a method for preparing aromatics 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 catalytic reforming, ethylene cracking ...

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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 101823929 B mainly propose the influence of cyclic aromatization of reaction products on the yield of aromatic hydrocarbons, but these patents still A reaction regeneration system that does not involve organic oxides to aromatics

[0006] Chinese patent CN 101244969 A 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 pipelines and solid conveying devices used for catalyst transportation, but the patent does not propose the specific form of the regeneration system, and there are some problems: the regenerator is only equipped with a gas-solid separation system, and the catalyst recovery rate is low, resulting in expensive catalysts. Severe running loss; 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 some hydrogen, water will be generated after combustion. Under the action of high temperature and water vapor The hydrothermal deactivation of the catalyst is serious, which leads to the reduction of the catalyst activity; the regenerator takes internal heat, and only one heat-taking coil is installed. When the coil bursts, a large amount of heat-taking medium enters the regenerator, which will cause the regenerator The pressure rises rapidly, and it may even cause an explosion in severe cases

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