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[Chemical Knowledge]：Manufacturing method and process flow of diethyl carbonate

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The manufacturing method
of diethyl carbonate
1. Introduction

Diethyl carbonate is an important organic chemical raw material, widely used in medicine, pesticides, plastics, spices and other fields. Therefore, it is of great significance to study the manufacturing method of diethyl carbonate for improving production efficiency, reducing cost and improving product quality. This article will introduce the manufacturing methods of diethyl carbonate, including esterification method, carbonation method and ethanol method.

2. esterification

esterification is one of the main methods for the production of diethyl carbonate, the principle of which is to react ethanol and carbonic acid to produce diethyl carbonate and water. The specific steps are as follows:

1. Ethanol and catalyst (such as sulfuric acid, phosphoric acid, etc.) are added into the reaction kettle and heated to a certain temperature.
2. Carbon dioxide gas is introduced to react ethanol with carbonic acid to produce diethyl carbonate and water.
3. Diethyl carbonate and water are separated by distillation to obtain diethyl carbonate with higher purity. The advantages of

esterification method are simple process, convenient operation and low cost, but it is easy to produce by-products, and it is necessary to strictly control the reaction conditions and the amount of catalyst.

3. Carbonation

Carbonation is a method of reacting ethanol and carbonate to produce diethyl carbonate and a salt. The specific steps are as follows:

1. Ethanol and carbonate (such as sodium carbonate, potassium carbonate, etc.) are added into a reaction kettle and heated to a certain temperature.
2. Carbon dioxide gas is introduced to react carbonate with carbon dioxide to form bicarbonate.
3. Reaction of bicarbonate with ethanol to form diethyl carbonate and a salt.
4. Diethyl carbonate and salts are separated by distillation to obtain a higher purity diethyl carbonate product. The advantage of

carbonation method is that it can reduce the amount of catalyst used and improve the purity of the product, but the operation is more complicated and the reaction conditions need to be strictly controlled.

4. ethanol method

ethanol method is a method in which ethanol is oxidized to acetaldehyde and then reacted with carbonate to produce diethyl carbonate. The specific steps are as follows:

1. Ethanol is added into the reaction kettle, and oxygen is introduced for oxidation reaction to generate acetaldehyde and water.
2. Add the generated acetaldehyde and carbonate (such as sodium carbonate, potassium carbonate, etc.) into another reactor and heat to a certain temperature.
3. Acetaldehyde reacts with carbonate to form diethyl carbonate and salt.
4. Diethyl carbonate and salts are separated by distillation to obtain a higher purity diethyl carbonate product. The advantage of

ethanol method is that it can avoid the use of catalysts and reduce equipment corrosion, but the reaction conditions are relatively harsh, requiring high temperature and high pressure conditions.

5. Conclusion There are many methods for the manufacture of

diethyl carbonate, including esterification, carbonation and ethanol. Different methods have different advantages and disadvantages and scope of application, and the appropriate manufacturing method should be selected according to the actual situation. At the same time, the reaction conditions and the quality of raw materials should be strictly controlled in the production process to improve product quality and production efficiency.

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