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[Chemical Knowledge]：Production and manufacturing method and process flow of ethylene glycol monobutyl ether

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Manufacturing method

of ethylene glycol monobutyl ether Ethylene glycol monobutyl ether is an important chemical raw material, widely used in coatings, inks, cleaning agents, dyes, pharmaceuticals and other fields. This article will introduce the manufacturing method of ethylene glycol monobutyl ether.

1. Reaction Principle

The production of ethylene glycol monobutyl ether is obtained by esterification of ethylene glycol and n-butanol under the action of acidic catalyst. The esterification reaction is a reversible reaction, and it is necessary to use an excess of alcohol to ensure the progress of the reaction. Meanwhile, in order to suppress the occurrence of side reactions, it is necessary to control the reaction temperature and the amount of the catalyst.

2. manufacturing process

1. ingredients

according to a certain proportion of ethylene glycol and butanol into the reactor, while adding a certain amount of acid catalyst.

2. Heating the reaction

Turn on the heating device of the reaction kettle, control the reaction temperature between 120-140 ℃, and keep the reaction liquid boiling. During the reaction, it is necessary to continuously sample and analyze the acid value and alcohol content of the reaction liquid to determine the progress of the reaction.

3. Cooling and Separation

When the acid value and the alcohol content of the reaction liquid reached predetermined values, heating was stopped and the reaction liquid was cooled to room temperature. The layers were then separated to separate the lower waste acid and the upper crude ethylene glycol monobutyl ether.

4. Refined

The crude ethylene glycol monobutyl ether is distilled, and the low boiling point impurities and moisture are distilled to obtain pure ethylene glycol monobutyl ether product.
Precautions for
3.

1. During the reaction process, the reaction temperature and the amount of catalyst should be strictly controlled to avoid the occurrence of side reactions.
2. In the process of batching, the quality and purity of raw materials should be guaranteed to avoid adverse effects on the reaction.
3. In the process of cooling separation, the cooling speed and layering time should be controlled to ensure the quality and yield of the product.
4. During the refining process, the distillation temperature and vacuum should be controlled to avoid product decomposition and loss.

4. environmental protection and safety

the manufacturing process of ethylene glycol monobutyl ether involves harmful substances and waste, so effective environmental protection and safety measures should be taken to ensure the sustainability of the production process. Specifically include:

1. Waste gas treatment: The waste gas generated during the reaction should be effectively treated to avoid harm to the environment and personnel.
2. Waste liquid treatment: The waste liquid produced after the reaction should be properly treated to avoid pollution to the environment.
3. operation safety: the production process should strictly abide by the safety operation procedures to ensure the personal safety of employees.

5. Conclusion

The manufacturing method of ethylene glycol monobutyl ether involves many links and precautions, and it is necessary to strictly control the process parameters and operation process to ensure the quality and yield of the product. At the same time, environmental protection and safety management should be strengthened to ensure the sustainability of the production process and the personal safety of employees.

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