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

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Ethylene glycol diacetate (EGDA) is an important raw material for chemical production, which is widely used in plastics, fibers, coatings, inks and other fields. This article will introduce the manufacturing method of ethylene glycol diacetate, including esterification reaction, purification and other steps.

1. Esterification Reaction

The manufacture of ethylene glycol diacetate is mainly achieved by esterification reaction. Esterification reaction refers to the reaction of acid and alcohol under certain conditions to produce ester and water. In this reaction, ethylene glycol reacts with acetic acid under certain conditions to form ethylene glycol diacetate and water. The reaction equation of the

esterification reaction is as follows:

CH3COOH HOCH2CH2OH → CH3COOCH2CH2OOCCH3 H2O

In actual production, the esterification reaction usually uses acidic catalysts, such as sulfuric acid, phosphoric acid, etc., to promote the reaction. Meanwhile, in order to remove the water generated by the reaction in time, it is necessary to separate the water from the reaction system by using a water-carrying agent such as benzene, toluene, etc.

the esterification reaction temperature, pressure and the amount of catalyst have an important influence on the reaction and the quality of the product. Therefore, in the actual production needs to be optimized and adjusted according to the specific situation.

2. Refining and Purification
The crude ethylene glycol diacetate obtained by the
esterification reaction contains impurities such as unreacted raw materials, by-products, catalysts, etc., and needs to be refined and purified to obtain high-quality ethylene glycol diacetate products.

purification methods include distillation, crystallization, adsorption and the like. Among them, distillation is a common purification method of ethylene glycol diacetate. Through distillation, ethylene glycol diacetate can be separated from unreacted raw materials, by-products, etc., to obtain ethylene glycol diacetate product with high purity. When the

is purified by distillation, it is necessary to select the appropriate distillation temperature and pressure according to the boiling point of ethylene glycol diacetate and the nature of impurities to ensure the quality and yield of the product.
Precautions for production and operation of
3.

In the production process of ethylene glycol diacetate, the following matters need to be paid attention to:

1. Strictly control the reaction temperature and pressure to avoid side reactions and safety issues during the reaction.
2. Select the appropriate catalyst and water-carrying agent to improve the rate and selectivity of the reaction.
3. In the process of refining and purification, it is necessary to ensure the cleanliness and tightness of the equipment to avoid product contamination and loss.
4. Regularly inspect and maintain the production equipment to ensure the normal operation and service life of the equipment.

In short, the manufacture of ethylene glycol diacetate needs to go through the steps of esterification reaction and purification, and the production process conditions and operation precautions need to be strictly controlled to ensure the quality and yield of the product.

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