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[Chemical Knowledge]：Production and manufacturing method and process flow of diethylene glycol

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The manufacturing method
of diethylene glycol
1. Introduction

diethylene glycol is an important chemical production raw material, widely used in coatings, inks, cleaning agents, antifreeze and other fields. With the increasing market demand, the manufacturing method of diethylene glycol has become a hot research topic. This article will introduce a common method of manufacturing diethylene glycol.

2. Materials and Equipment

1. Materials: ethylene glycol, sodium hydroxide, catalyst (such as magnesium sulfate), water, etc.
2. Equipment: reaction kettle, stirrer, thermometer, condenser, separatory funnel, etc.

3. manufacturing steps

1. add ethylene glycol and water in a certain proportion to the reaction kettle and stir evenly.
2. Add the catalyst, heat up to a certain temperature, and keep the constant temperature for a certain time.
3. Add sodium hydroxide solution, adjust the pH value to neutral, and continue stirring for a certain period of time.
4. cool down to room temperature, stand and separate layers, and separate the aqueous layer and the organic layer.
5. Distillation of the organic layer to collect the diethylene glycol product.

4. Precautions

1. Strictly control the reaction temperature and time to prevent the formation of by-products.
2. When adjusting the pH value, it should be avoided that too much alkali causes a large loss of ethylene glycol.
3. During the distillation process, the distillation speed and temperature should be controlled to avoid product decomposition.

5. Conclusion

Through the above steps, we can manufacture high-quality diethylene glycol products. In the actual production process, we need to adjust the process parameters according to the specific situation to ensure the quality and yield of the product. At the same time, we also need to pay attention to the safety issues in the production process to ensure the smooth progress of the production process.

above is a common diethylene glycol manufacturing method, but the specific manufacturing method may be different due to different raw materials, equipment, process conditions and other factors. Therefore, in the actual production process, we need to choose the appropriate manufacturing method according to the actual situation, and constantly optimize the process parameters to improve the quality and yield of the product.

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