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[Chemical Knowledge]：Epichlorohydrin production method and process

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Manufacturing method

of epichlorohydrin Epichlorohydrin is an important organic chemical raw material, which is widely used in epoxy resin, solvent, surfactant and other fields. This article will introduce the manufacturing method of epichlorohydrin, including raw material preparation, reaction process, post-treatment and precautions.

1. Raw Material Preparation

The main raw materials for the manufacture of epichlorohydrin are propylene, chlorine and milk of lime. Among them, propylene is a carbon three olefin, chlorine is a kind of active gas, lime milk is used as a neutralizing agent. Before preparation, the quality of raw materials needs to be inspected to ensure compliance with production requirements.

2. reaction process

The manufacturing process of epichlorohydrin mainly includes the following steps:

1. Chlorination reaction: Under the action of an initiator, propylene and chlorine gas undergo an addition reaction to generate 3-chloropropene. This reaction needs to be carried out at a certain temperature and pressure to ensure the smooth progress of the reaction.
2. Epoxidation reaction: 3-chloropropene reacts with hydrogen peroxide in alkaline absorption solution to generate epichlorohydrin. This reaction requires proper pH and temperature control to facilitate the epoxidation reaction.
3. Neutralization reaction: The generated epichlorohydrin reacts with lime milk to generate epichlorohydrin salt. This step is to remove the acidic substances in the reaction system and ensure the purity of the product.

3. post-treatment

After the above reaction is completed, the product needs to be post-treated, including distillation, extraction, crystallization and other steps, so as to obtain epichlorohydrin with higher purity. At the same time, the waste liquid and waste gas are properly treated to prevent environmental pollution.
Precautions for
4.

1. Strictly control the quality of raw materials to ensure that the reaction generates the required substances.
2. In the process of chlorination reaction and epoxidation reaction, it is necessary to control the appropriate temperature and pressure to ensure the smooth progress of the reaction. At the same time, we should also pay close attention to the exothermic reaction to prevent safety accidents caused by high temperature.
3. During the neutralization reaction, it is necessary to control the appropriate pH value to ensure the complete neutralization reaction. At the same time, we should also pay attention to the speed of adding milk of lime to prevent excessive local alkali caused by adding too fast.
4. During the entire manufacturing process, it is necessary to pay close attention to the operating conditions of the equipment to ensure the normal operation of the equipment and avoid equipment failures affecting production.
5. For the waste liquid and waste gas, it is necessary to properly handle, comply with environmental protection laws and regulations, and prevent pollution to the environment.

In short, the manufacturing process of epichlorohydrin needs to strictly control the process parameters of each link to ensure the quality and purity of the product. At the same time, it is also necessary to pay attention to environmental protection and production safety issues, comply with relevant regulations and standards, and provide protection for the sustainable development of enterprises.

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