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[Chemical Knowledge]：TCPP manufacturing methods and processes.

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TCPP (tris (2-chloroethyl) phosphate) is an important raw material for chemical production, which is widely used in flame retardants, plastic plasticizers, pesticides and other fields. The following is TCPP manufacturing method:

1. raw materials to prepare

1. Phosphoric acid: industrial grade phosphoric acid is selected, which requires high purity. Generally, the mass fraction of phosphoric acid is not less than 85%.
2. Chloroethane: industrial grade chloroethane, with high purity requirements, generally requires the mass fraction of chloroethane not less than 99%.

2. reaction process

1. add phosphoric acid into the reaction kettle and start the stirrer to make the phosphoric acid evenly dispersed.
2. While stirring, slowly add ethyl chloride dropwise to control the dropping rate to make the reaction proceed smoothly.
3. After the addition is completed, continue stirring for a certain period of time to complete the reaction.
4. After the reaction is completed, stand and separate layers, and take out the upper liquid, that is, the crude TCPP.

3. post-treatment

1. Crude TCPP needs to go through washing, dehydration, distillation and other steps to obtain TCPP products with higher purity.
2. Washing: The crude TCPP was washed with alkaline water to remove acidic impurities therein.
3. Dehydration: The washed TCPP is dehydrated with a desiccant to reduce its water content.
4. Distillation: Distillation of the dehydrated TCPP to collect the target boiling point fraction to obtain a TCPP product with higher purity.

4. Precautions

1. In the manufacturing process, it is necessary to strictly control the reaction temperature and dropping speed to avoid excessive reaction and cause safety accidents.
2. In the post-processing process, it is necessary to ensure the operation specifications of washing, dehydration and distillation steps to ensure product quality.
3. The waste gas and waste water generated in the manufacturing process need to be effectively treated to avoid pollution to the environment.

In summary, the TCPP manufacturing method requires strict control of the operating conditions of each step to ensure product quality and production safety. At the same time, it is necessary to strengthen the environmental protection treatment of waste water and waste gas to protect the environment and protect the health of workers.

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