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Preparation method of m-methyl benzoyl formyl chloride

A technology of toluoyl chloride and toluic acid, which is applied in the field of preparation of m-toluoyl chloride, can solve the problems of long processing reaction time, low production efficiency, and time-consuming, so as to facilitate industrial production and improve the market Competitiveness, the effect of simple and easy access to raw materials

Inactive Publication Date: 2010-12-08
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported preparation method of m-toluoyl chloride is to be synthesized by m-toluic acid and phosphorus pentachloride, the problems of this type of preparation method: 1, because this reaction generates phosphorus oxychloride when carrying out, and chlorination Oxyphos needs expensive equipment to process it. Therefore, there are many production equipment and high costs, resulting in high production costs.
2. Since the phosphorus oxychloride treatment step is essential and very time-consuming in the production of m-toluyl chloride, the treatment reaction time is long and the cost is extremely high. Therefore, the method has the problems of long production time and low production efficiency , the cost is extremely high, which is not conducive to the improvement of the economic benefits of the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of preparation method of m-toluoyl chloride, concrete steps are:

[0017] (1) Chlorination reaction steps:

[0018] In a 1000-liter reaction kettle with a heating device, an electric stirring device, and a thermometer, 400 kilograms of m-toluic acid and 850 kilograms of thionyl chloride are successively dropped into, and heated to 73 ° C under stirring to react simultaneously, and keep this temperature state. Stop heating until no more gas is discharged, and the chlorination reaction is completed.

[0019] (2) Distillation steps:

[0020] The oily liquid obtained by the chlorination reaction is distilled to obtain m-toluoyl chloride with a content of more than 98.5%.

Embodiment 2

[0022] A kind of preparation method of m-toluoyl chloride, concrete steps are:

[0023] (1) Chlorination reaction steps:

[0024] Add 400 kilograms of m-toluic acid and 855 kilograms of thionyl chloride successively in a 1000-liter reactor with a heating device, electric stirring, and a thermometer, and heat to 75° C. for reaction while stirring, and keep this temperature state until There are no more releases. Heating was stopped, and the chlorination reaction was completed.

[0025] (2) Distillation steps:

[0026] The oily liquid obtained by the chlorination reaction is distilled to obtain m-toluoyl chloride with a content of more than 98.5%.

Embodiment 3

[0028] A kind of preparation method of m-toluoyl chloride, concrete steps are:

[0029] (1) Chlorination reaction steps:

[0030] Add 400 kilograms of m-toluic acid and 955 kilograms of thionyl chloride successively in a 1000-liter reaction kettle with a heating device, electric stirring, and a thermometer, and heat to 77° C. for reaction under stirring, and keep this temperature state until There are no more releases. Heating was stopped, and the chlorination reaction was completed.

[0031] (2) Distillation steps:

[0032] The oily liquid obtained by the chlorination reaction is distilled to obtain m-toluoyl chloride with a content of more than 98.5%.

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Abstract

The invention relates to a preparation method of m-methyl benzoyl formyl chloride. The method comprises the following: (1), a step of chloric substitution reaction, namely adding methyl benzoic acid and thionyl chloride into a reaction kettle, heating to 70 to 85 DEG C with stirring, maintaining the temperature to react until no gas is exhausted, and stopping heating to finish the chloric substitution reaction; and (2), a step of distillation, namely distilling an oily liquid mixture obtained through the chloric substitution reaction to obtain the finished product of m-methyl benzoyl formyl chloride. Due to the adoption of the direct chloric substitution reaction in the preparation method of the m-methyl benzoyl formyl chloride, the reaction is easy. The method has the advantages that: the operation is convenient, simple and feasible; the realization of industrial production is convenient; and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of organic compound preparation, in particular to a preparation method of m-toluoyl chloride. Background technique [0002] In chemical industry production, m-toluoyl chloride, as an intermediate of important organic compounds, is more and more widely used. The reported preparation method of m-toluoyl chloride is to be synthesized by m-toluic acid and phosphorus pentachloride, the problems of this type of preparation method: 1, because this reaction generates phosphorus oxychloride when carrying out, and chlorination Oxonphosphorus needs expensive equipment to process, so there are many production equipment and high costs, resulting in high production costs. 2. Since the phosphorus oxychloride treatment step is essential and very time-consuming in the production of m-toluyl chloride, the treatment reaction time is long and the cost is extremely high. Therefore, the method has the problems of long production time and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/04C07C51/60
Inventor 张富强
Owner TIANJIN CHEM REAGENT RES INST
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