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[Chemical Knowledge]：Manufacturing method and process of diethanolamine

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Diethanolamine (DEA) is an important organic chemical raw material, which is widely used in medicine, pesticide, dye, rubber, plastic, textile and other fields. In the field of chemical production raw materials, the manufacturing methods of diethanolamine mainly include chloroethanol method, ethylene oxide method and ammoniation method. This article will detail these three manufacturing methods.

1. Chloroethanol method

Chloroethanol method is based on chloroethanol and ammonia as raw materials, through neutralization, distillation, dehydration and other processes to produce diethanolamine. The specific steps are as follows:

(1) Add chloroethanol and liquid ammonia into a reactor, control a certain temperature and pressure, and perform a neutralization reaction to generate chloramine and ethanol. The reaction solution is distilled

(2) to separate unreacted chloroethanol and ammonia to obtain a mixture of chloramine and ethanol.

(3) A mixture of chloramine and ethanol is added into a dehydrating agent, and a certain temperature and pressure are controlled to perform a dehydration reaction to generate diethanolamine and water. Water is separated

(4), and diethanolamine is refined to obtain a finished product.
the production process of
chloroethanol method is mature and simple to operate, 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 method

ethylene oxide method is ethylene oxide and ammonia as raw materials, after addition, hydrolysis, distillation and other processes to produce diethanolamine. The specific steps are as follows:

(1) Ethylene oxide and liquid ammonia are added into a reactor, and an addition reaction is carried out at a certain temperature and pressure to generate aminoethanol. The reaction solution is hydrolyzed

(2) to convert aminoethanol into diethanolamine and water. Water is separated

(3), and diethanolamine is distilled to obtain a finished product.

ethylene oxide production process is relatively simple, the product purity is high, but the production process requires high temperature and high pressure conditions, energy consumption is large.

3. ammoniation method

ammoniation method is based on glyoxal and ammonia as raw materials, after addition, reduction, distillation and other processes to produce diethanolamine. The specific steps are as follows:

(1) Glyoxal and liquid ammonia are added into a reactor, and an addition reaction is carried out at a certain temperature and pressure to generate aminoacetaldehyde.

(2), aminoacetaldehyde is subjected to a reduction reaction to produce diethanolamine. Diethanolamine is distilled

(3) to obtain a finished product.
the production process of
ammoniation method is relatively new and the product yield is high, but the production process requires the use of expensive catalysts and the cost is high.

In summary, the chloroethanol method, the ethylene oxide method and the ammoniation method can all be used to produce diethanolamine, but each method has its advantages and disadvantages and scope of application. In actual production, a suitable manufacturing method can be selected according to specific conditions. At the same time, in order to protect the environment and reduce energy consumption, it is necessary to further improve and optimize the manufacturing process of diethanolamine.

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