Preparation system and method of halogenated benzaldehyde
A halogenated benzaldehyde and preparation system technology, which is applied in the preparation of organic compounds, carboxylate salts, carbon-based compounds, etc., can solve the problems of difficult waste gas treatment and low oxygen utilization rate, and achieve high utilization rate and improved Concentration and temperature distribution, high safety effect
Pending Publication Date: 2020-12-08
NANJING YANCHANG REACTION TECH RES INST CO LTD
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[0004] In the process of producing o- and p-halobenzaldehydes by selective oxidation of halotoluene, traditional gas-liquid reactors, such a
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[0058] refer to figure 1 As shown, take the selective oxidation of chlorotoluene to generate chlorobenzaldehyde as an example, specifically including:
[0059] Step 1: Pass chlorinated toluene, solvent (acetic acid), catalyst (Co / Mn / Br composite catalyst), cocatalyst (alkali metal compound) into the batching tank 10 and mix; The pipeline enters the gas-liquid intensified reactor 20; oxygen enters the bottom of the gas-liquid intensified reactor 20 through the oxygen inlet 201; the gas-liquid intensified reactor 20 is a gas-liquid intensified reactor 20 without tail gas discharge, which can improve the oxygen utilization rate and Reduce energy consumption; After the reaction is completed, the mixed material (chlorinated toluene, chlorobenzaldehyde, chlorobenzoic acid, catalyst, solvent) mixed material outlet 202 is sent into the rectifying tower 30 by the mixed material pump 100 through the pipeline, and the subsequent refining process is carried out. distillation separation; ...
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The invention provides a preparation system and method of halogenated benzaldehyde. The preparation system comprises a batching tank and a 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 enhanced reactor; 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 preparation 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 bebetter realized, and the preparation system has the advantages of high reaction efficiency, low energy consumption and less three wastes.
Description
technical field [0001] The invention relates to the field of selectively catalytically synthesizing halogenated benzaldehydes from halogenated toluenes, in particular to a preparation system and method for halogenated benzaldehydes. Background technique [0002] The main product of halotoluene oxidation 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 intermediates in medicine and dyes. In recent years, with th...
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Login to View More IPC IPC(8): C07C45/36C07C45/82C07C47/55C07C51/265C07C51/44C07C63/70B01J27/128B01J8/08B01J8/00
CPCC07C45/36C07C45/82C07C51/265C07C51/44B01J27/128B01J8/08B01J8/0035B01J8/008C07C47/55C07C63/70
Inventor 张志炳张锋杨建魏世明罗华勋周政
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD