TCPP (tris (2-chloroethyl) phosphate) is an important raw material for chemical production, widely used in flame retardants, plastic plasticizers, pesticides and other fields. The following is the manufacturing method of TCPP:
I. Preparation of raw materials
1. Phosphoric acid: industrial grade phosphoric acid is used, which is required to have high purity, and the mass fraction of phosphoric acid is generally required to be not less than 85%.
2. Ethyl chloride: industrial grade ethyl chloride, the purity is required to be high, generally require that the mass fraction of ethyl chloride is not less than 99%.
2. Reaction process
1. Add phosphoric acid into the reactor, turn on the stirrer to make the phosphoric acid evenly dispersed.
2. While stirring, slowly add ethyl chloride, control the rate of dropping, so that the reaction proceeds smoothly.
3. After dropping, continue stirring for a certain period of time to make the reaction complete.
4. After the end of the reaction, let it stand and stratify, take out the upper layer of liquid, which is the crude product of TCPP.
3. Post-treatment
1. Crude TCPP needs to be washed, dehydrated and distilled to obtain TCPP products with higher purity.
2. Washing: Wash the crude TCPP with alkaline water to remove the acidic impurities in it.
3. Dehydration: Dehydrate the washed TCPP with desiccant to reduce its water content.
4. Distillation: Distill the dehydrated TCPP and collect the fractions at the target boiling point to obtain the TCPP product with higher purity.
4. Precautions
1. During the manufacturing process, the reaction temperature and titration rate need to be strictly controlled in order to avoid overly violent reactions that may cause safety accidents.
2. In the post-treatment process, it is necessary to ensure the operation specification of washing, dehydration and distillation steps to ensure the product quality.
3. The waste gas and waste water generated during the manufacturing process need to be effectively treated to avoid pollution to the environment.
In conclusion, the manufacturing method of TCPP needs to strictly control the operating conditions of each step to ensure product quality and production safety. At the same time, environmental protection treatment of wastewater and exhaust gas needs to be strengthened to protect the environment and safeguard workers' health.
