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[Chemical Knowledge]：Production and manufacturing method and process flow of caprolactam

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The manufacturing method
of caprolactam
1. Introduction

caprolactam is an important organic chemical raw material, widely used in the production of nylon 6 fiber, engineering plastics, films and other products. With the continuous development of science and technology, the manufacturing method of caprolactam is also constantly improved and optimized. This article will introduce several common caprolactam manufacturing methods, and analyze their advantages and disadvantages.

2. the properties and uses of caprolactam

caprolactam is a white crystalline powder with high melting point, high boiling point and good thermal stability. Its main use is as a raw material for the production of nylon 6 fiber and engineering plastics, and can also be used for the production of adipic acid, hexamethylene diamine and other chemical products.

3. caprolactam manufacturing method

1. photo nitrosation method

photo nitrosation method is a traditional caprolactam manufacturing method, the principle is in the light conditions, the cyclohexanone and sodium nitrite reaction to generate cyclohexanone oxime, and then cyclohexanone oxime in acidic conditions to generate caprolactam rearrangement. The advantages of this method are that the process is mature and the operation is simple, but a large amount of waste water and waste gas will be produced in the production process, which will cause pollution to the environment.

2. Phenol method

The phenol method is an improved caprolactam manufacturing method. Its principle is to react phenol with hydroxylamine to produce phenol hydroxylamine, and then phenol hydroxylamine reacts with cyclohexanone under acidic conditions to produce caprolactam. The advantages of this method are that the raw materials are easy to obtain and the yield is high, but a large amount of hydrochloric acid waste liquid will be produced in the production process, which needs to be treated.

3. Cyclohexanone oxime method

Cyclohexanone oxime method is a more advanced caprolactam manufacturing method, the principle is the reaction of cyclohexanone and hydroxylamine to generate cyclohexanone oxime, and then cyclohexanone oxime in the role of a catalyst Beckman rearrangement reaction to generate caprolactam. The advantages of this method are mild reaction conditions, high yield and good product quality, which is one of the methods widely used at home and abroad. The advantages and disadvantages of various manufacturing methods of

4.

Although the process is mature, a large amount of waste water and waste gas will be produced in the production process, which will pollute the environment. The raw material of phenol method is easy to obtain and the yield is high, but a large amount of hydrochloric acid waste liquid will be produced in the production process. The cyclohexanone oxime method is a relatively advanced manufacturing method with mild reaction conditions, high yield and good product quality.

5. Conclusion

With the continuous improvement of environmental awareness and the continuous development of chemical technology, the traditional caprolactam manufacturing methods need to be improved and optimized to reduce environmental pollution in the production process and improve product quality. As an advanced manufacturing method, cyclohexanone oxime method has great application prospect and development space.

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