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[Chemical Knowledge]：Manufacturing method and process flow of ethylene glycol monoethyl ether

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The manufacturing method

of ethylene glycol monoethyl ether (Ethylene Glycol Monoethyl Ether, referred to as EGME) is a commonly used chemical production raw material, widely used in coatings, cleaning agents, printing inks and other fields. This article will introduce the manufacturing method of ethylene glycol monoethyl ether.

1. Manufacturing Principle

The manufacturing principle of ethylene glycol monoethyl ether is mainly through the esterification reaction of ethylene glycol and ethanol in the presence of an acidic catalyst to generate ethylene glycol monoethyl ether and water. The reaction equation is as follows:

CH3CH2OH HOCH2CH2OH → HOCH2CH2OCH2CH3 H2O

2. manufacturing steps

1. Ingredients

according to a certain proportion of ethylene glycol and ethanol into the reaction kettle, while adding the right amount of acid catalyst.

2. heating reaction

open the reactor heating device, control the reaction temperature in a certain range, so that ethylene glycol and ethanol in the catalyst esterification reaction.

3. Separation and Purification

After completion of the reaction, the reaction solution was distilled to separate ethylene glycol monoethyl ether and water. Temperature and pressure should be controlled during distillation to ensure product purity.

4. Refining

The ethylene glycol monoethyl ether obtained by distillation was refined to remove impurities therein to obtain a high quality ethylene glycol monoethyl ether product.

3. Precautions

1. Catalyst Selection

Choosing a suitable acid catalyst has a great influence on the reaction speed and product purity. Common catalysts include sulfuric acid, hydrochloric acid, etc.

2. the control of reaction temperature

reaction temperature is too high may lead to the occurrence of side reactions, affecting the purity of the product; reaction temperature is too low may affect the reaction rate. Therefore, it is necessary to control the reaction temperature reasonably.

3. Equipment selection and maintenance

select the appropriate reactor and distillation equipment, and regular maintenance and maintenance to ensure the normal operation of the equipment and product quality.

4. environmental protection and safety

In the manufacturing process of ethylene glycol monoethyl ether, attention should be paid to environmental protection and safety. The waste water, waste gas and other pollutants are effectively treated to reduce the impact on the environment. At the same time, strengthen the safety management of the production site to ensure the personal safety of employees.

In short, the manufacture of ethylene glycol monoethyl ether needs to master the appropriate manufacturing principles, steps and precautions, and pay attention to environmental protection and safety to improve product quality and yield. In the actual production process, it is necessary to optimize and adjust according to the specific situation to meet the needs of ethylene glycol monoethyl ether in different fields.

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