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[Chemical Knowledge]：Production and manufacturing method and process flow of amino cyclic acid

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Aminocyclic acid is an important raw material for chemical production, which is widely used in medicine, pesticide, dye and other fields. This paper will introduce the manufacturing method of amino cyclic acid, including raw material preparation, reaction steps, post-treatment and so on.

1. raw material preparation

to manufacture amino cyclic acid need to prepare the following raw materials: aniline, sodium cyanide, sulfuric acid, sodium nitrite, sodium hydroxide. Among them, aniline and sodium cyanide are the main raw materials, sulfuric acid is used to adjust the pH of the reaction system, sodium nitrite is used for oxidation reaction, and sodium hydroxide is used for neutralization reaction.

2. Reaction Step

1. Aniline reacts with sodium cyanide to generate benzonitrile

Aniline and sodium cyanide are added into a reaction kettle, heated to a certain temperature, stirred for a certain period of time, to generate benzonitrile. The reaction is an exothermic reaction, and it is necessary to control the reaction temperature to avoid accidents caused by overheating.

2. Benzonitrile reacts with sulfuric acid to generate benzonitrile sulfonic acid

Benzonitrile is added to sulfuric acid, heated to a certain temperature, stirred for a certain time, to generate benzonitrile sulfonic acid. The reaction is an exothermic reaction, and it is necessary to control the reaction temperature to avoid accidents caused by overheating.

3. benzonitrile sulfonic acid and sodium nitrite reaction to generate diazonium benzene sulfonic acid

will be benzonitrile sulfonic acid and sodium nitrite into the reactor, control a certain temperature and pH value, stirring for a certain period of time, the generation of diazonium benzene sulfonic acid. The reaction is exothermic and the diazonium salt produced is explosive, requiring strict control of the reaction conditions.

4. diazobenzenesulfonic acid reacts with sodium hydroxide to generate amino cyclic acid

diazobenzenesulfonic acid and sodium hydroxide are added into the reaction kettle, and the temperature and pH value are controlled and stirred for a certain period of time to generate amino cyclic acid. The reaction is an exothermic reaction, and it is necessary to control the reaction temperature to avoid accidents caused by overheating.

3. post-treatment
After the
reaction is completed, the reaction solution needs to be post-treated, including pH adjustment, extraction, crystallization, drying and other steps, so as to obtain a high purity aminocyclic acid product. At the same time, waste liquid, waste gas and other wastes need to be treated to avoid environmental pollution.
Precautions for
4.

1. During the entire manufacturing process, it is necessary to strictly control the reaction temperature and pH value to avoid accidents and reduce product quality.
2. Regular maintenance and inspection of reaction equipment and pipelines are required to ensure normal operation of equipment and stable product quality.
3. Operators need to have relevant knowledge and skills, and strictly abide by operating procedures and safety regulations to ensure the safety and smoothness of the production process.

In short, the manufacturing method of aminocyclic acid requires strict control of reaction conditions and post-treatment processes to ensure product quality and production safety. At the same time, it is necessary to strengthen the treatment of waste water, waste gas and other wastes to protect the environment.

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