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[Chemical Knowledge]：The manufacturing method and process of EG.

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Ethylene glycol (EG) is an important chemical raw material, which is widely used in polyester fiber, antifreeze, unsaturated polyester resin and other fields. The following is a detailed description of the manufacturing method of ethylene glycol.

1. chloroethanol method

chloroethanol method is a method of preparing ethylene glycol by alkaline hydrolysis reaction with chloroethanol as raw material. This method is mature and simple to operate, but a large amount of waste water and waste gas will be produced in the production process, which will cause great pollution to the environment.

1. Preparation of Chloroethanol

Chlorine gas is introduced into ethanol to react to generate a mixture of chloroethanol, which is separated by distillation to obtain chloroethanol.

2. Alkaline hydrolysis reaction

Chloroethanol is mixed with sodium hydroxide aqueous solution, and a certain temperature and pH value are controlled to carry out alkaline hydrolysis reaction to generate ethylene glycol and sodium chloride.

3. Separation and purification

Through distillation, extraction and other separation and purification methods, ethylene glycol and sodium chloride and other impurities are separated to obtain high purity ethylene glycol products.

2. ethylene oxide hydration method

ethylene oxide hydration method is ethylene oxide as raw material, and water reaction method of ethylene glycol. This method has the advantages of easy access to raw materials, mild reaction conditions and high product quality, and is a commonly used method for the preparation of ethylene glycol in industry.

1. Production of Ethylene Oxide

Ethylene oxide is produced by a method such as an ethylene oxidation method or an ethylene chlorination method.

2. Hydration reaction

ethylene oxide and water in accordance with a certain proportion of mixing, control a certain temperature and pressure, hydration reaction to produce ethylene glycol.

3. separation and purification

through distillation, extraction and other separation and purification methods, ethylene glycol and water and other impurities are separated to obtain high purity ethylene glycol products.

3. Dimethyl Carbonate Method

The dimethyl carbonate method is a method in which dimethyl carbonate is used as a raw material and ethylene glycol is produced by a transesterification reaction. This method has the advantages of easy access to raw materials, mild reaction conditions and high product purity, and is a promising method for the preparation of ethylene glycol.

1. Preparation of Dimethyl Carbonate Dimethyl carbonate is

prepared by reacting phosgene with methanol.

2. Transesterification

Dimethyl carbonate and ethylene glycol monomethyl ether are mixed, and the transesterification reaction is carried out to generate ethylene glycol and methanol under certain temperature and pressure.

3. separation and purification

through distillation, extraction and other separation and purification methods, ethylene glycol and methanol and other impurities are separated to obtain high purity ethylene glycol products.

4. Ethylene Oxidation

Ethylene Oxidation is a method in which ethylene is used as a raw material, ethylene oxide is produced by an oxidation reaction, and ethylene glycol is produced by a hydration reaction. This method has the advantages of easy access to raw materials, high production efficiency and good product quality, and is a commonly used method for the preparation of ethylene glycol.

1. Ethylene oxidation reaction

ethylene and oxygen mixed, the introduction of catalyst, control of a certain temperature and pressure, oxidation reaction to produce ethylene oxide.

2. Hydration reaction

ethylene oxide and water in accordance with a certain proportion of mixing, control a certain temperature and pressure, hydration reaction to produce ethylene glycol.

3. separation and purification

through distillation, extraction and other separation and purification methods, ethylene glycol and water and other impurities are separated to obtain high purity ethylene glycol products.

In short, there are many manufacturing methods of ethylene glycol, and different methods have different advantages and disadvantages and scope of application. In actual production, the appropriate manufacturing method should be selected according to the specific situation to ensure product quality and production efficiency.

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