Manufacturing method of trichloroacetone
I. Introduction
Trichloroacetone is an important raw material for the production of chemicals, which is widely used in the fields of pharmaceuticals, pesticides, dyes and so on. In this paper, we will introduce the manufacturing method of trichloroacetone, including the steps of raw material preparation, reaction process, and post-processing, aiming to provide readers with a comprehensive and detailed manufacturing method.
II. Raw material preparation
The manufacture of trichloroacetone requires the preparation of the following raw materials: acetone, chlorine gas and sodium hydroxide. Among them, acetone is used as the main raw material, chlorine gas is used as the chlorinating agent, and sodium hydroxide is used as the catalyst.
III. Reaction process
1. Chlorination reaction
Acetone and chlorine gas are added into the reaction kettle according to a certain proportion, the reaction temperature is controlled at 40-60℃, the reaction pressure is at 0.2-0.4MPa, and sodium hydroxide solution is passed in as the catalyst to carry out the chlorination reaction. During the chlorination reaction, the reactants need to be stirred constantly to ensure a uniform reaction. The chlorination reaction produces a mixture of monochloroacetone, dichloroacetone and trichloroacetone.
2. Separation and purification
After the chlorination reaction, the reaction solution was cooled to room temperature, diluted by adding an appropriate amount of water, and then the pH was adjusted to acidic with hydrochloric acid to precipitate the trichloroacetone. Filter to get the crude trichloroacetone.
3. Refining
Add the crude trichloroacetone into the refining kettle, add appropriate amount of sodium hydroxide solution, heat and reflux to remove the acidic impurities. Then cool to room temperature, adjust the pH to neutral, precipitate the refined trichloroacetone. Filter, wash and dry to get the final trichloroacetone product.
4. Precautions
1. During the chlorination reaction, the temperature and pressure should be strictly controlled to avoid safety accidents caused by too high temperature or too high pressure.
2. In the process of separation and purification, pH value should be controlled so that trichloroacetone can be fully precipitated and precipitated out.
3. In the refining process, the addition of sodium hydroxide solution should be controlled to avoid excessive introduction of impurities.
V. Conclusion
Through the above manufacturing method, we can get the product of trichloroacetone with high purity. In the actual production process, the manufacturing method should be adjusted and optimized appropriately according to the specific situation in order to improve the production efficiency and product quality. Meanwhile, the safety protection measures in the production process should be strengthened to ensure the production safety and smooth progress.
