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[Chemical Knowledge]：Manufacturing method and process of trichloroethylene

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Trichloroethylene is an important chemical raw material, widely used in the manufacture of plastics, rubber, coatings, solvents and other fields. This article will introduce the manufacturing method of trichloroethylene, including raw material preparation, reaction process, post-treatment and so on.

1. raw material preparation

manufacturing trichloroethylene need to prepare the following raw materials: vinyl chloride, chlorine gas and anhydrous aluminum chloride. Among them, vinyl chloride can be obtained by ethylene chlorination method or acetylene method, chlorine gas can be obtained by electrolytic salt water and other methods, anhydrous aluminum chloride can be obtained by metal aluminum and chlorine gas reaction.

2. reaction process

1. Add anhydrous aluminum chloride into the reactor and heat it to a certain temperature to melt it.
2. Introduce vinyl chloride and chlorine into the reactor, control a certain proportion and flow rate, and make the gas fully contact with anhydrous aluminum chloride.
3. Under the catalysis of anhydrous aluminum chloride, vinyl chloride and chlorine gas react to produce trichloroethylene and hydrogen chloride gas.
4. Control the reaction temperature and pressure to make the reaction proceed smoothly and avoid the formation of by-products.

3. post-treatment

1. after the end of the reaction, stop the introduction of vinyl chloride and chlorine, the reactor is cooled to room temperature.
2. Pour the reaction solution into a separatory funnel, add an appropriate amount of water, stir evenly, and stand for stratification.
3. The anhydrous aluminum chloride in the lower layer is separated and recycled; the trichloroethylene in the upper layer is separated from the aqueous layer.
4. Distillation of trichloroethylene to separate the pure trichloroethylene product.
Precautions for
4.

1. In the manufacturing process, the quality and proportion of raw materials must be strictly controlled to avoid the formation of impurities and by-products.
2. The control of reaction temperature and pressure has an important influence on the quality and yield of the product, and needs to be adjusted according to the actual situation.
3. Pay attention to safety during post-treatment and avoid contact with corrosive substances such as anhydrous aluminum chloride.

In short, the manufacturing method of trichloroethylene needs to strictly control the process parameters and operation process of each link to ensure the quality and yield of the product. At the same time, it is necessary to pay attention to production safety and environmental protection to avoid harm to operators and the environment.

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