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[Chemical Knowledge]：Preparation of o-chlorobenzoic acid and matters needing attention

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O-chlorobenzoic acid is an important chemical intermediate, widely used in medicine, dyes, pesticides and other industries. The preparation of o-chlorobenzoic acid is a complex process and requires strict compliance with operating procedures. Let's introduce the preparation method of o-chlorobenzoic acid and related precautions.

1. the preparation method of o-chlorobenzoic acid
o-chlorobenzoic acid is mainly prepared by acidification of chlorobenzene and formic anhydride. The specific steps are as follows:
1. add chlorobenzene and formic anhydride into the reaction kettle according to a certain molar ratio, and start the stirrer to fully stir;
2. control the reaction temperature within a suitable range, generally between 120-150 degrees Celsius;
3. stop heating and reduce the temperature to room temperature after the complete reaction of chlorobenzene and formic anhydride;
4. filtering to obtain the mixture of unreacted chlorobenzene, formic anhydride and ortho-chlorobenzoic acid;
5. distilling and separating the mixture to obtain pure ortho-chlorobenzoic acid.
This is the basic preparation method of o-chlorobenzoic acid, which needs to be operated in strict accordance with the operating procedures to prevent accidents.
Precautions for the preparation of
2. o-chlorobenzoic acid
1. Process operators must have relevant chemical production skills, abide by production operation procedures and strictly implement safety operation procedures;
2. Reactor and related equipment should be inspected, maintained and maintained frequently to ensure the normal operation of the equipment;
3. Operators must wear personal protective equipment, including protective glasses, protective masks, protective gloves, etc, avoid damage caused by contact with harmful substances;
4. Strengthen ventilation during operation to ensure fresh indoor air;
5. In case of equipment failure or abnormal situation, timely report and emergency treatment shall be carried out.

The above is o-chlorobenzoic acid preparation methods and precautions, hoping to provide some guidance for chemical production. In the process of chemical production, we must strictly follow the operating procedures to ensure safe production.