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[Chemical Knowledge]：Production and manufacturing method and process of dioctyl phthalate (DOP)

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of Dioctyl Phthalate (DOP) Manufacturing Method
Dioctyl Phthalate (DOP) is a common plasticizer, widely used in plastics, rubber, paint, coatings and other fields. This article will introduce the manufacturing method of DOP.

1. Raw Material Preparation
The manufacture of
DOP requires the following raw materials: phthalic anhydride, octanol.

2. reaction principle

DOP is produced by esterification of phthalic anhydride and octanol to produce dioctyl phthalate and water.

3. process

1. phthalic anhydride and octanol in accordance with a certain proportion of the reactor, heating to a certain temperature, start the esterification reaction.
2. In the reaction process, it is necessary to add catalyst in time to promote the reaction. At the same time, it is also necessary to constantly remove the water generated by the reaction to keep the reaction going.
3. When the reaction is completed, the heating is stopped, the reaction solution is cooled to room temperature, and then allowed to stand and separate into layers.
4. After layering, the upper liquid was poured off to obtain a crude DOP product. The crude DOP product contains impurities such as unreacted raw materials and catalysts, and further treatment is required.
5. The crude DOP product is refined, usually by distillation, washing and other methods to remove impurities and obtain pure DOP products.
Precautions for
4.

1. In the production process, it is necessary to strictly control the reaction temperature and time to ensure the complete progress of the reaction.
2. It is necessary to regularly test the quality indicators of the product, such as acid value, chroma, moisture, etc., to ensure the quality and stability of the product.
3. In the production process, attention should be paid to safety to avoid accidents such as fire and explosion.

In short, the manufacture of DOP needs to master certain chemical technology and operation methods, and at the same time, it needs to strictly control the production process to ensure product quality and safety.

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