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[Chemical Knowledge]：Production process and preparation method of m-aminophenol

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m-Aminophenol is a common organic compound, which is widely used in dye, medicine and other fields. This article will introduce the production process and preparation method of m-aminophenol.

1. Production Process

The production process of m-aminophenol mainly includes two steps: hydrogenation of benzaldehyde and amination of resorcinol. The specific scheme is as follows:

1. Hydrogenation of benzaldehyde

Benzaldehyde is reacted with hydrogen in the presence of a suitable catalyst to produce benzyl alcohol. Benzyl alcohol and ammonia are then reacted under alkaline conditions to give benzyl alcohol amine. Finally, under the appropriate conditions, the benzene amide reduction to amino phenol.

2. Amination
of resorcinol
Resorcinol amine is obtained by reacting resorcinol with ammonia under alkaline conditions. Resorcinol amine is then re-oxidized under an oxygen atmosphere at an appropriate temperature and catalyst to finally obtain m-aminophenol.

2. preparation method

1. hydrogenation preparation of

benzaldehyde, hydrogen and catalyst into the reaction kettle, the reaction temperature and pressure control in the appropriate range, after a certain period of time to get benzyl alcohol. An appropriate amount of ammonia and sodium hydroxide are then added to react to form benzamide. Finally, benzyl amide was reduced under appropriate conditions to obtain m-aminophenol.

2. Preparation of
by amination
Resorcinol and ammonia are reacted under alkaline conditions. After the reaction, a certain amount of hydrogen peroxide is added, and then an appropriate transition metal catalyst is added to carry out the re-oxidation reaction. After completion of the reaction, m-aminophenol having a relatively high purity is obtained by separation and purification operations such as distillation and extraction.

3. Precautions

1. During the reaction, place the reactor in a well-ventilated area to avoid gas accumulation.

2. Select the appropriate catalyst and reaction conditions to improve the reaction efficiency and product purity.

3. In the preparation process, pay attention to the treatment and disposal of waste.

above is the production process and preparation method of amino phenol, hoping to provide some reference for practitioners in related fields. At the same time, we should also pay attention to the safety of chemical experiments and minimize the risks during the experiment.