Intelligent reaction system and method for preparing halogenated benzaldehyde by oxidizing halogenated toluene

Abstract

The invention provides an intelligent reaction system and method for preparing halogenated benzaldehyde by oxidizing halogenated toluene. The intelligent reaction system comprises a batching tank anda gas-liquid enhanced reactor which are connected in sequence, a solvent, halogenated toluene and a catalyst enter the batching tank to be uniformly mixed and then enter the gas-liquid enhanced reactor to be subjected to an enhanced reaction, an oxygen inlet is formed in the side wall of the gas-liquid enhanced reactor, and a mixed material outlet is formed in the bottom of the gas-liquid enhancedreactor; the mixed material outlet is connected with a rectifying tower for rectification separation, substances flowing out of the bottom of the rectifying tower enter a flash tower for separation,substances coming out of the top of the flash tower enter a product tower for product purification, and halogenated benzaldehyde is obtained. According to the intelligent reaction system provided by the invention, the utilization rate of raw materials is increased, halogenated benzaldehyde with the purity of 99wt% or above and halogenated benzoic acid with the purity of 98wt% or above can be obtained at the same time, the circulation of a catalyst and a solvent can be better realized, and the intelligent reaction system has the advantages of high reaction efficiency, low energy consumption andless three wastes.

Description

technical field [0001] The invention relates to the field of selectively catalytically synthesizing halogenated benzaldehydes from halogenated toluenes, in particular to an intelligent reaction system and method for preparing halogenated benzaldehydes by oxidizing halogenated toluenes. Background technique [0002] The main product of the oxidation of halotoluene is halobenzoic acid. Using MC catalyst and traditional process conditions, halotoluene can be completely oxidized to halobenzoic acid, but this reaction is difficult to bring economic benefits. Therefore, controlling the oxidation depth so that the oxidation product stays in the halogenated benzaldehyde has very important industrial realization value and significance. p-Halogenated benzaldehyde is used in the production of pharmaceuticals and pesticides, such as the preparation of pharmaceutical raw materials and intermediates such as sedative fennarol and phenylbutyric acid; halogenated benzaldehyde can be used as ...

AI Technical Summary

Problems solved by technology

[0004] In the process of producing o- and p-halobenzaldehydes by selective oxidation of halotoluene, traditional gas-liquid reactors, such as stirred reactors, bubbling reactors and stirred bubbling reactors, have low oxygen utilization, Difficult problems in waste gas treatment

[0005] In addition, with the rapid development of informatization, the application of intelligent systems is becoming more and more extensive. Moreover, it is easy to make mistakes and the labor cost is relatively high by adopting the method of artificially controlling the operation process.

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