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[Chemical Knowledge]：Production and manufacturing method and process flow of o-phenylenediamine

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O-phenylenediamine (OPD) is an important organic chemical raw material, which is widely used in dyes, pharmaceuticals, pesticides, rubber and other fields. This paper will introduce the manufacturing method of o-phenylenediamine, including raw materials, process flow, operation steps, equipment selection and so on.

1. raw material

o-phenylenediamine manufacturing raw material is mainly aniline. Aniline is a common organic compound that can be obtained from coal tar or petroleum cracking.

2. Process

The manufacturing process of o-phenylenediamine mainly includes the following steps:

1. aniline oxidation: aniline is mixed with oxidant for oxidation reaction to generate o-phenylenediamine and water. Commonly used oxidants are nitric acid, hydrogen peroxide, etc.

2. Neutralization: The acidic substance generated by the oxidation reaction is neutralized, and the pH value is adjusted to precipitate o-phenylenediamine.

3. Filtration: The precipitated o-phenylenediamine was separated by filtration to obtain a crude product.

4. Refining: Refining the crude product to remove impurities and obtain pure o-phenylenediamine product.

3. operation steps

1. ingredients: aniline and oxidant according to a certain proportion of ingredients, into the reactor.

2. Oxidation reaction: In the reactor, the aniline and the oxidant are heated and stirred to fully react to generate o-phenylenediamine and water.

3. Neutralization adjustment: The acidic substance in the reactor was neutralized to adjust the pH value to precipitate o-phenylenediamine.

4. Filtration and separation: The precipitated o-phenylenediamine was filtered and separated to obtain a crude product.

5. Refining treatment: The crude product is refined to remove impurities and obtain a pure o-phenylenediamine product.

4. equipment selection

o-phenylenediamine manufacturing process needs to be used in the equipment including reactors, stirrers, filters, refining equipment. When selecting equipment, it is necessary to comprehensively consider factors such as production scale, product quality, safety and environmental protection, and select equipment that meets production requirements.

5. safety and environmental protection requirements

In the manufacturing process of o-phenylenediamine, it is necessary to pay attention to safety and environmental protection requirements and take corresponding measures to ensure the safety and environmental protection of the production process. For example, strengthen equipment maintenance to prevent leakage accidents; control the discharge of pollutants such as waste water and waste gas to meet environmental protection standards.

6. manufacturing advantages and disadvantages

o-phenylenediamine manufacturing method has the advantages of easy access to raw materials, simple process, convenient operation, etc., so it has been widely used in the field of chemical production. However, this method also has some shortcomings, for example, a large amount of waste water, waste gas and other pollutants will be produced in the production process, and effective treatment measures need to be taken; at the same time, because o-phenylenediamine is toxic and corrosive, it has high safety requirements for production equipment and operators.

To sum up, the manufacturing method of o-phenylenediamine needs to comprehensively consider factors such as raw materials, process flow, operation steps, equipment selection, safety and environmental protection requirements, etc., to ensure the safety and environmental protection of the production process and improve product quality and production efficiency.

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