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[Chemical Knowledge]：Production and manufacturing method and process flow of diphenyl phosphite

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The manufacturing method

of diphenyl phosphite. Diphenyl phosphite is an important organophosphorus compound, which is widely used in pesticide, medicine, plastic, dye and other fields. This article will introduce the manufacturing method of diphenyl phosphite, including raw material preparation, reaction process, post-treatment and other links.

1. Raw Material Preparation

The main raw materials for the manufacture of diphenyl phosphite are phenol and phosphorous acid. In order to ensure the smooth progress of the reaction, it is necessary to add phenol and phosphorous acid into the reactor according to a certain molar ratio. At the same time, it is also necessary to add a certain catalyst to promote the reaction. Commonly used catalysts are sulfuric acid, phosphoric acid, etc.

2. reaction process

in the reaction kettle, phenol and phosphorous acid in the role of the catalyst esterification reaction, the formation of diphenyl phosphite and water. It is necessary to control certain temperature and pressure in the reaction process to ensure the smooth progress of the reaction. At the same time, it is also necessary to constantly stir the reactants to promote the uniform progress of the reaction.

3. Post-Treatment
After the end of the
reaction, the reaction product needs to be post-treated. First, the reaction solution needs to be cooled to room temperature, and then a certain alkaline absorbent is added to neutralize the acidic substances generated during the reaction. Commonly used alkaline absorbent with sodium hydroxide, potassium hydroxide and so on.

Next, the reaction liquid needs to be separated and purified. Commonly used methods are distillation, extraction, crystallization, etc. Through separation and purification, high purity diphenyl phosphite products can be obtained.
Precautions for
4.

In the process of manufacturing diphenyl phosphite, the following matters need to be paid attention to:

1. Control the reaction temperature and pressure to avoid overheating or overpressure;
2. Select the appropriate Catalyst to ensure the smooth progress of the reaction;
3. In the post-treatment process, attention should be paid to the amount and neutralization degree of alkaline absorbent to avoid affecting the purity of the product;
4. In the process of separation and purification, it is necessary to select appropriate methods and equipment according to the nature and actual conditions of the product to ensure the purity and yield of the product.

In short, the manufacturing method of diphenyl phosphite needs to control the process parameters and operation points of each link to ensure the quality and output of the product. At the same time, it is necessary to pay attention to safety and environmental protection during the production process, comply with relevant laws, regulations and standard requirements, and ensure the legality and sustainability of production.

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