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[Chemical Knowledge]：Production and manufacturing method and process of chloroacetic acid (sulfur method)

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The manufacturing method
of chloroacetic acid (sulfur method)
chloroacetic acid is an important organic chemical raw material, which is widely used in pesticides, pharmaceuticals, dyes, plastics and other fields. There are many manufacturing methods of chloroacetic acid, among which sulfur method is a common production method. This article will detail the manufacturing method of chloroacetic acid (sulfur method).

1. raw materials and equipment

1. raw materials: acetic acid, chlorine, sulfur, sodium hydroxide.
2. Equipment: reaction kettle, condenser, storage tank, agitator, pump, thermometer, pressure gauge, etc.

2. Manufacturing Steps

1. Add acetic acid to the reactor, start the stirrer, and maintain a certain stirring speed.
2. Pour chlorine gas and add sulfur at the same time to make chlorine gas and sulfur react in acetic acid to generate chloroacetic acid and sulfuric acid.
3. Control the reaction temperature, generally in the range of 30-50 ℃, to avoid the formation of by-products caused by excessive temperature.
4. The pH value of the reaction solution is continuously monitored during the reaction. When the pH value drops to a certain value, the reaction is basically completed.
5. Sodium hydroxide solution is added to the reaction solution, and the pH value is adjusted to neutral or slightly acidic to precipitate chloroacetic acid as a salt.
6. The precipitate was filtered, washed and dried to give the chloroacetic acid product.
Precautions for
3.

1. Strictly control the reaction temperature and pH value to avoid the formation of by-products and the decline of product quality.
2. During the operation, the equipment should be kept well sealed to prevent chlorine leakage and environmental pollution.
3. Operators should wear protective equipment to avoid contact with toxic and harmful substances.
4. Waste shall be properly disposed of to avoid environmental and ecological hazards.

4. product quality control

1. product quality inspection, including purity, acidity, chlorine content and other indicators.
2. Monitor the production process to ensure stable and reliable product quality.
3. Deal with unqualified products to prevent them from entering the market.

In short, the manufacturing method of chloroacetic acid (sulfur method) requires strict control of reaction conditions and operating processes to ensure product quality and production safety. At the same time, it is necessary to strengthen waste disposal and environmental protection to achieve green production.

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