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) feeding organic oxides to a dense-phase bed reaction section in a fluidized bed reactor to contact the organic oxides with an aromatization catalyst to carry out an aromatization reaction; b) feeding oil gas which entrains less amount of a catalyst and is reacted in the dense-phase bed reaction section into a reactor dilute phase section in the upper part of the fluidized bed reactor, separating reaction products from a to-be-regenerated catalyst in the reactor dilute phase section, and feeding the separated reaction product to a follow-up product recovery and separation system; and c) coking the to-be-regenerated catalyst after the reaction into the lower part of the dense-phase bed reaction section to contact the coked catalyst with the organic oxides from the dense-phase bed reaction section. The method is used for producing the aromatic hydrocarbon through catalytic conversion of the organic oxides. The method satisfies yield and selectivity of product, and reduces catalyst loss and stably controls reactor temperature.

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 the applications of their end products include synthetic resin, synthetic fiber, synthetic Rubber, paint, dye, medicine 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: naphtha catalytic reforming, ethylene cracking 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 101823929 B mainly propose the influence of cyclic aromatization of reaction products on the yield of aromatic hydrocarbons, but these patents still Does not involve organic oxide to aromatics reaction system

[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 two There are pipelines and solid delivery devices for catalyst delivery, but the patent does not propose the specific form of the reactor, and there are some problems: the reactor is only equipped with a one-stage gas-solid separation system, and the recovery rate of the catalyst is low, resulting in expensive Catalyst running loss is serious; the patent proposes that the aromatization reactor needs to be provided with heat, and the heat supply of the reactor is provided by the inner coil of the reactor, but in fact, the process of catalytic conversion of organic oxides to aromatics is an exothermic reaction, and the reactor Heating measures should be set instead of heating measures

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