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[Chemical Knowledge]：Manufacturing method and process of dioctyl ester

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Dioctyl ester is a widely used chemical raw material, mainly used in the production of plastics, rubber, fiber and other polymer materials. The manufacturing method mainly includes esterification method, transesterification method, etc. This article will detail these two manufacturing methods.

1. esterification method

esterification method is the main method for the production of dioctyl ester, the principle is under the action of acidic catalyst, let the acid and ethanol esterification reaction, the generation of dioctyl ester and water. The specific steps are as follows:

1. octanoic acid and ethanol are added into a reaction kettle according to a certain molar ratio, and a certain amount of acidic catalyst is added at the same time.
2. Heat the reaction kettle to raise the reaction temperature to a certain value and maintain a certain reaction time.
3. After completion of the reaction, the reaction solution was cooled and separated to obtain a crude dioctyl ester product.
4. The crude product was refined to obtain dioctyl ester product with high purity. The advantages of

esterification method are mature process and simple operation, but a large amount of wastewater will be produced in the production process, which needs to be treated. In addition, the use of acidic catalysts will also have a certain corrosive effect on the equipment.

2. transesterification

transesterification is another method of producing dioctyl ester, the principle is in the role of alkaline catalyst, let the triglyceride and methanol transesterification reaction, the formation of glycerol and methyl ester, methyl ester and octanoic acid esterification reaction, the formation of dioctyl ester. The specific steps are as follows:

1. add triglyceride and methanol into the reaction kettle according to a certain molar ratio, and add a certain amount of alkaline catalyst at the same time.
2. Heat the reaction kettle to raise the reaction temperature to a certain value and maintain a certain reaction time.
3. After completion of the reaction, the reaction solution was cooled and separated to obtain a mixture of glycerin and methyl ester.
4. Methyl ester and octanoic acid are added into the reactor according to a certain molar ratio, and a certain amount of acidic catalyst is added at the same time.
5. Heat the reaction kettle to raise the reaction temperature to a certain value and maintain a certain reaction time.
6. After completion of the reaction, the reaction solution was cooled and separated to obtain a crude dioctyl ester product.
7. The crude product was refined to obtain dioctyl ester product with high purity. The advantage of

transesterification is that it can reduce the production of wastewater, and it can also use waste triglycerides as raw materials, which has a certain economy. However, the operation of this method is relatively complicated, and it is necessary to control a plurality of reaction steps.

No matter which method is used, it is necessary to strictly control the production process to ensure the quality and purity of the product. At the same time, the waste generated in the production process also needs to be treated reasonably to avoid environmental pollution.

In short, the manufacturing methods of dioctyl ester mainly include esterification and ester exchange, and different methods have different advantages and disadvantages and scope of application. In actual production, it is necessary to choose the appropriate method according to the specific situation, and strictly control and manage the production process to ensure product quality and environmental protection.

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