Method of continuously oxidizing 3,5-dichlorotoluene for producing 3,5-dichlorobenzaldehyde

By using cobalt, molybdenum, and bromine metal ion complexes to catalyze the reaction of 3,5-dichlorotoluene and hydrogen peroxide in a tubular reactor, the existing technology problems of large catalyst usage, long reaction time, and many side reactions are solved. problem, achieving efficient and safe production of 3,5-dichlorobenzaldehyde and reducing production costs.

CN106588606AInactive Publication Date: 2017-04-26CHANGZHOU UNIV
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Patent Information

Application Number
CN201610972093.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2016-11-07
Publication Date
2017-04-26
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing methods for producing 3,5-dichlorobenzaldehyde have problems such as large amounts of catalysts, long reaction times, many side reactions, low safety, and poor mass and heat transfer effects, making it difficult to achieve industrialized continuous production.

Method used

Using a tubular reactor with a specific structure, 3,5-dichlorotoluene and hydrogen peroxide are used to perform continuous oxidation reactions under the catalysis of cobalt, molybdenum, and bromine metal ion complexes. The reaction temperature and solvent are controlled by adjusting the flow rate and reaction residence time. Proportion to achieve efficient mixing and heat transfer of reaction materials and reduce the occurrence of side reactions.

Benefits of technology

The reaction time is shortened, the stability and selectivity of the product are improved, the usage of oxidants and catalysts is reduced, the use of cocatalysts is avoided, production efficiency and safety are improved, and production costs are reduced.

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Abstract

The invention provides a method of continuously oxidizing 3,5-dichlorotoluene for producing 3,5-dichlorobenzaldehyde and belongs to the technical field of organic synthesis process. In the method, 3,5-dichlorobenzaldehyde is used as a raw material, one or more metal ionic complexes of cobalt, molybdenum, bromine serve as a catalyst, H2O2 serves as an oxidant and acetic acid serves as a solvent, and then the 3,5-dichlorotoluene is continuously oxidized in a tubular reactor to prepare the 3,5-dichlorobenzaldehyde. The method has mild conditions, short reaction time and high raw material utilization rate, can achieve effective control during the reaction process, is safe and stable, allows continuous operation and has high production efficiency.
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