Manufacturing Method of Isophthalonitrile
Isophthalonitrile is an important raw material for chemical production, widely used in medicine, pesticide, dye and other fields. In this article, we will introduce the manufacturing method of isophthalonitrile, including raw material preparation, reaction steps, post-treatment and so on.
I. 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 is generally used in chemically pure reagent grade isophthalic acid.
2. Ammonia: Ammonia is used to react with isophthalic acid to form isophthalonitrile.
3. Catalyst: Acidic catalysts such as sulfuric acid and phosphoric acid are generally used to promote the reaction.
II. Reaction steps
Isophthalonitrile is generally manufactured by the following methods:
1. Isophthalic acid is mixed with catalyst and added into the reactor.
2. Admit ammonia gas, control the reaction temperature between 180-220℃ and the reaction pressure between 0.5-1.0MPa.
3. Stirring is required during the reaction to ensure that the reaction proceeds uniformly.
4. After the reaction, the reactor was cooled to room temperature to obtain the crude product of isophthalonitrile.
3. Post-treatment
The crude product of isophthalonitrile needs to be post-treated by the following steps:
1. Wash the crude product with water to remove the residual catalyst and reaction by-products.
2. Carry out recrystallization with organic solvent to get isophthalonitrile product with higher purity.
3. Test the product to ensure that its purity and quality meet the relevant standards.
4. Precautions
1. The manufacturing process of isophthalonitrile needs to pay attention to controlling the reaction temperature and pressure to ensure the safety and smooth progress of the reaction.
2. In the post-treatment process, washing and recrystallization need to be ensured to improve the purity and quality of the product.
3. The manufacturing process needs to pay attention to environmental protection and waste gas treatment to avoid pollution to the environment.
In conclusion, the manufacture of isophthalonitrile needs to strictly control the quality of raw materials, reaction conditions and post-treatment process to ensure the purity and quality of the product. At the same time, attention needs to be paid to environmental protection and safe production to ensure the sustainability of the manufacturing process.
