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[Chemical Knowledge]：Manufacturing method and process flow of diethyl succinate

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The manufacturing method
of diethyl succinate
1. Introduction

Diethyl succinate (Diethyl Succinate) is an important organic chemical raw material, widely used in medicine, pesticides, plastics, spices and other fields. Therefore, it is of great significance to study the manufacturing method of diethyl succinate. This article will introduce a common diethyl succinate manufacturing method.

2. Materials and Equipment

1. Materials: succinic acid, ethanol, sulfuric acid, sodium hydroxide.
2. Equipment: reaction kettle, condenser, water separator, stirrer, thermometer, pH meter.

3. Manufacturing Steps

1. Esterification Reaction

Succinic acid and ethanol are added into a reaction kettle and stirred evenly. Sulfuric acid was then slowly added as a catalyst. The reaction vessel was heated to maintain the temperature at 80-90°C for about 4-5 hours. In this process, water is continuously divided to maintain the concentration of alcohol in the reaction system. When the succinic acid is completely dissolved and the moisture in the reaction system does not increase any more, the esterification reaction ends.

2. Neutralization

The reaction solution was cooled to room temperature and then neutralized to pH 7-8 with sodium hydroxide solution, so that the sulfuric acid catalyst was completely neutralized. The aqueous layer was separated and the organic phase was collected.

3. Distillation and purification

The collected organic phase is distilled, the unreacted ethanol is distilled at atmospheric pressure, and then diethyl succinate is distilled under reduced pressure, and the purity can reach more than 99%.
Precautions for
4.

1. Strictly control the reaction temperature to prevent the decomposition of succinic acid.
2. Ethanol should be added in time during the water separation process to maintain the concentration of alcohol in the reaction system.
3. The pH value should be controlled during the neutralization reaction to avoid excessive alkalinization.
4. Maintain a proper vacuum during distillation to avoid high temperature decomposition.

5. Conclusion The

can produce diethyl succinate with high purity through the steps of esterification reaction, neutralization reaction and distillation purification. In the actual production process, the operating conditions of each step should be strictly controlled to ensure product quality and yield. The manufacturing method introduced in this paper has the advantages of simple operation, easy availability of raw materials and low cost, and is suitable for industrial production. By continuously optimizing the production process, the production efficiency and purity of diethyl succinate can be improved, which provides strong support for the development of medicine, pesticide, plastic, spice and other fields.

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