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[Chemical Knowledge]：Manufacturing method and process of diethylene glycol (DEG)

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Diethylene glycol (DEG) is an important chemical raw material, which is widely used in solvents, lubricants, antifreeze, plasticizers and other fields. The following are methods for producing diethylene glycol, including a chloroethanol method, an ethylene oxide hydration method, an ethylene glycol method, and the like.

1. Chloroethanol method

Chloroethanol method is the main method of producing diethylene glycol at home and abroad, the process is as follows:

1. Chloroethanol reacts with sodium hydroxide solution to produce sodium chloroethanol.
2. Sodium chloroethanol reacts with sulfuric acid to produce diethylene glycol and sodium sulfate.
3. Diethylene glycol is separated from sodium sulfate to obtain pure diethylene glycol product.

the advantages of this method are mature process, simple operation and low cost, 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.

2. ethylene oxide hydration

ethylene oxide hydration is a more advanced production of diethylene glycol method, the process is as follows:

1. ethylene oxide and water in the catalyst under the action of the reaction, the generation of ethylene glycol.
2. Ethylene glycol is dehydrated to diethylene glycol under the action of acidic catalyst.

The advantage of this method is that less waste water and exhaust gas are produced in the production process, and the impact on the environment is small, but it requires the use of precious metal catalysts and the cost is high.

3. ethylene glycol method

ethylene glycol method is a more traditional method for the production of diethylene glycol, the process is as follows:

1. ethylene glycol in the acidic catalyst under the action of methanol reaction, the generation of methyl ethylene glycol.
2. Methyl glycol is dehydrated to diethylene glycol under the action of alkaline catalyst.

The advantages of this method are simple process and convenient operation, but a large amount of methanol needs to be used in the production process, the cost is high, and a certain amount of waste water and waste gas will be produced.

In summary, the chloroethanol method, the ethylene oxide hydration method and the ethylene glycol method are all methods for producing diethylene glycol, and each method has its advantages and disadvantages and scope of application. When choosing a production method, you need to consider comprehensively according to the actual situation and choose the most suitable production method. At the same time, with the continuous improvement of environmental awareness and technological progress, the future production process of diethylene glycol will be more environmentally friendly, efficient and energy-saving.

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