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[Chemical Knowledge]：Production and manufacturing method and process flow of dioctyl adipate

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The manufacturing method
of dioctyl adipate
1. Introduction

dioctyl adipate (DOA) is a widely used chemical production raw material, mainly used in the production of plasticizers and lubricants. Due to its unique chemical properties, DOA has a wide range of applications in the plastic, rubber, paint and coating industries. This article will detail the manufacturing method of dioctyl adipate.

2. Materials and Equipment

1. Materials: adipic acid, octyl alcohol, catalysts (such as p-toluenesulfonic acid), antioxidants, etc.
2. Equipment: esterification reactor, distillation column, condenser, stirrer, pump, etc.

3. Manufacturing Steps

1. Esterification Reaction
In an esterification reactor, adipic acid and octanol, and an appropriate amount of catalyst are added. Under the action of the agitator, the materials are thoroughly mixed. The reactor is then heated to control the temperature at 120-150°C to cause esterification of adipic acid and octanol to form a mixture of dioctyl adipate and water.
2. Dehydration
After the esterification reaction is completed, the reaction solution is transferred to a distillation column for dehydration operation. In the distillation column, appropriate temperature and vacuum degree are controlled so that water vapor is extracted, thereby achieving the purpose of dehydration. During the dehydration process, it is necessary to regularly detect the acid value and moisture of the liquid at the bottom of the tower to ensure product quality.
3. Refining
The dehydrated dioctyl adipate solution contains unreacted adipic acid and octyl alcohol and requires a refining operation. The solution was transferred to another distillation column, the temperature and vacuum were properly controlled, unreacted adipic acid and octyl alcohol were distilled off, and the dioctyl adipate product at the bottom of the column was collected.
4. Add antioxidant
In order to improve the stability of the product, add an appropriate amount of antioxidant to the refined dioctyl adipate, and stir well.
Precautions for
4.

1. In the manufacturing process, parameters such as temperature, vacuum and stirring speed of each step should be strictly controlled to ensure product quality and output.
2. The selection and amount of catalyst have an important influence on the rate and product selectivity of esterification reaction, so it needs to be optimized according to the actual situation.
3. During the dehydration and refining process, the acid value, moisture and other related indicators of the product should be regularly tested to ensure that the product quality meets the standards.

5. Conclusion

Through the above steps, we can successfully produce dioctyl adipate. This manufacturing method has the advantages of simple operation and stable product quality, and is suitable for large-scale production. In the actual production process, the manufacturing parameters should be adjusted and optimized according to the specific situation to improve production efficiency and reduce energy consumption.

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