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

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Manufacturing method

of ethylene glycol methyl ether Ethylene glycol methyl ether (EGME) is an important raw material for chemical production, which is widely used in coatings, inks, cleaning agents, printing and dyeing auxiliaries and other fields. This article will introduce the manufacturing method of ethylene glycol methyl ether, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of ethylene glycol methyl ether are ethylene glycol and methanol. In order to ensure product quality, raw materials with higher purity should be selected. Generally, the purity of ethylene glycol is ≥ 99% and the purity of methanol is ≥ 99.5.

2. reaction process

1. esterification reaction
ethylene glycol and methanol mixed in a certain proportion, adding catalyst sulfuric acid, heating to a certain temperature for esterification reaction. During the reaction, the temperature and stirring speed need to be controlled to keep the reaction uniform. The esterification reaction produces ethylene glycol monomethyl ether and water.
2.
Separation by Distillation After the esterification reaction, ethylene glycol monomethyl ether and water are separated by distillation. The distillation temperature and pressure were controlled to obtain higher purity ethylene glycol monomethyl ether.
3. Alcoholysis reaction
The distilled ethylene glycol monomethyl ether is mixed with excess methanol, alkaline catalyst is added, and the temperature is raised to a certain temperature for alcoholysis reaction. The alcoholysis reaction produces ethylene glycol methyl ether and methanol.
4.
recovery by distillation After the alcoholysis reaction, excess methanol is recovered by distillation, and the purity of ethylene glycol methyl ether is further improved.

3. post-treatment

1. Neutralization treatment
adding an alkaline absorbent to the product, allowing it to react with the remaining acidic catalyst, and adjusting the pH to neutral.
2. Dehydration treatment
remove the moisture in the product by adding desiccant or using molecular sieve to improve the stability of the product.
3. Filtration and packaging
after neutralization, dehydration treatment of the product, filtration to remove impurities, and then according to the requirements of packaging.
Precautions for
4.

1. Strictly control the quality of raw materials to ensure product purity.
2. During the esterification reaction and alcoholysis reaction, it is necessary to control the temperature and stirring speed to keep the reaction uniform and avoid local overheating and side reactions.
3. The temperature and pressure should be controlled during the distillation process to ensure the purity and yield of the product.
4. In the post-treatment process, attention should be paid to the control of pH value, moisture and other indicators to ensure stable product quality.
5. Pay attention to safety in the production process to avoid accidents such as fire and poisoning.

In short, the manufacturing method of ethylene glycol methyl ether involves multiple links and precautions, and it is necessary to strictly control the quality of raw materials, reaction conditions and post-treatment process to ensure product quality and production safety. At the same time, it is also necessary to optimize and improve according to specific production conditions to improve production efficiency and economic benefits.

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