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[Chemical Knowledge]：The production and manufacturing method and process flow of benzene two nitrile.

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The manufacturing method

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

1. Raw Material Preparation

The following raw materials need to be prepared for the manufacture of isophthalonitrile:

1. isophthalic acid: isophthalic acid is the main raw material of isophthalonitrile, and isophthalic acid of chemical pure reagent grade is generally used.

2. Ammonia: Ammonia is used to react with isophthalic acid to produce isophthalonitrile.

3. Catalyst: In general, an acidic catalyst such as sulfuric acid or phosphoric acid is used to promote the reaction.

2. reaction step

isophthalonitrile is generally manufactured by the following method:

1. isophthalic acid is mixed with a catalyst and added to a reactor.

2. Ammonia gas is introduced, the reaction temperature is controlled between 180-220 ℃, and the reaction pressure is between 0.5-1.0MPa.

3. During the reaction, constant stirring is required to ensure uniform reaction.

4. After the reaction was completed, the reactor was cooled to room temperature to obtain crude isophthalonitrile.

3. post-treatment

crude isophthalonitrile needs to be post-treated through the following steps:

1. washing the crude product with water to remove residual catalyst and reaction by-products.

2. Recrystallization with an organic solvent gives a high purity isophthalonitrile product.

3. The product is tested to ensure that its purity and quality meet the relevant standards.

4. precautions

1. isophthalonitrile manufacturing process need to pay attention to control the reaction temperature and pressure, in order to ensure the safety and smooth progress of the reaction.

2. In the post-treatment process, it is necessary to ensure the effect of washing and recrystallization to improve the purity and quality of the product.

3. Attention should be paid to environmental protection and waste gas treatment during the manufacturing process to avoid environmental pollution.

In short, the manufacture of isophthalonitrile requires strict control of raw material quality, reaction conditions and post-treatment process to ensure product purity and quality. At the same time, it is necessary to pay attention to environmental protection and safe production to ensure the sustainable development of the manufacturing process.

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