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[Chemical Knowledge]：The production and manufacturing method and process of dioctyl terephthalate.

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Dioctyl terephthalate (DOTP) is a widely used plasticizer, mainly used in polyvinyl chloride (PVC) and other plastic products. The following is the production method of dioctyl terephthalate:

1. raw material preparation

The main raw materials for the production of dioctyl terephthalate are terephthalic acid and octanol. The quality of raw materials has a great influence on the quality of the final product, so it is necessary to choose high quality raw materials.

2. Esterification Reaction

Terephthalic acid and octanol are added into a reaction kettle according to a certain molar ratio, heated and stirred to fully mix the raw materials. A catalyst is then added to promote the esterification reaction. Esterification reaction is a reversible reaction, and it is necessary to control certain reaction conditions, such as temperature, pressure and the amount of catalyst, in order to improve the conversion and selectivity of the reaction.

3. Dehydration Reaction
After completion of the
esterification reaction, the reaction solution needs to be dehydrated to remove water generated by the reaction. Water is usually distilled off from the reaction solution by vacuum distillation. It is necessary to control the temperature and vacuum during the dehydration process to avoid decomposition and loss of the product.

4. Refining and Purification
After the
dehydration reaction is completed, the product needs to be refined and purified to remove impurities and by-products. The product is usually purified to a certain degree of purity by distillation and filtration.

5. post-treatment

After refining and purification, the product needs to be post-treated, such as adjusting the pH value, adding antioxidants, etc., to improve the stability and storage life of the product.

The above is the general method for manufacturing dioctyl terephthalate. The specific manufacturing process needs to be adjusted and optimized according to the actual situation. At the same time, it is necessary to pay attention to the safety and environmental protection of the production process to avoid harm to the environment and operators.

In short, the manufacture of dioctyl terephthalate requires the mastery of certain chemical reaction principles and chemical operation techniques, as well as strict control of production conditions and quality standards to ensure the quality and stability of the final product.

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