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[Chemical Knowledge]：Manufacturing method and process flow of trichloroacetone

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The manufacturing method
of trichloroacetone
1. Introduction

Trichloroacetone is an important raw material for the production of chemical products, widely used in medicine, pesticides, dyes and other fields. This article will introduce the manufacturing method of trichloroacetone, including raw material preparation, reaction process, post-treatment and other steps, aiming to provide readers with a comprehensive and detailed manufacturing method.

2. Raw Material Preparation

The manufacture of trichloroacetone requires the preparation of the following raw materials: acetone, chlorine and sodium hydroxide. Among them, acetone as the main raw material, chlorine as chlorinating agent, sodium hydroxide as catalyst.

3. reaction process

1. chlorination reaction

acetone and chlorine gas according to a certain proportion into the reaction kettle, control the reaction temperature at 40-60 ℃, the reaction pressure at 0.2-0.4MPa, into the sodium hydroxide solution as a catalyst, chlorination reaction. During the chlorination reaction, the reactants need to be constantly stirred to ensure uniform reaction. The chlorination reaction produces a mixture of monochloroacetone, dichloroacetone and trichloroacetone.

2. Separation and purification of

After the chlorination reaction was completed, the reaction solution was cooled to room temperature, diluted by adding an appropriate amount of water, and then the pH value was adjusted to acidic with hydrochloric acid to precipitate trichloroacetone. Crude trichloroacetone was obtained by filtration.

3. Refined

Add the crude trichloroacetone into a refining kettle, add an appropriate amount of sodium hydroxide solution, and heat to reflux to remove acidic impurities. After cooling to room temperature, the pH was adjusted to neutral and purified trichloroacetone was precipitated. Filtration, washing and drying gave the final trichloroacetone product.
Precautions for
4.

1. During the chlorination reaction, the temperature and pressure should be strictly controlled to avoid safety accidents caused by excessive temperature or excessive pressure.
2. In the process of separation and purification, the pH value should be controlled to fully precipitate trichloroacetone.
3. In the refining process, the amount of sodium hydroxide solution should be controlled to avoid excessive introduction of impurities.

5. Conclusion

Through the above manufacturing method, we can obtain trichloroacetone products with higher purity. In the actual production process, the manufacturing method should be adjusted and optimized according to the specific situation to improve production efficiency and product quality. At the same time, the safety protection measures in the production process should be strengthened to ensure the smooth progress of production safety.

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