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[Chemical Knowledge]：Manufacturing method and process flow of methacrylonitrile

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The manufacturing method
of methacrylonitrile
methacrylonitrile (MAN) is an important organic chemical raw material, which is widely used in synthetic fiber, plastic, rubber and other fields. This article will introduce the manufacturing method of methacrylonitrile, including raw material preparation, reaction process, post-treatment and so on.

1. Feedstock Preparation
The manufacture of
methacrylonitrile requires the following feedstocks: acrylonitrile, methanol, and a catalyst. Among them, acrylonitrile is the main raw material, methanol is used as a reactant to participate in the reaction, and the catalyst is used to accelerate the reaction process. In order to ensure the smooth progress of the reaction, strict quality control and ratio of raw materials are required.

2. reaction process

The manufacture of methacrylonitrile mainly adopts the ester exchange method, the specific steps are as follows:

1. mix acrylonitrile and methanol according to a certain proportion, add the catalyst, stir evenly and then send it into the reactor.
2. At a certain temperature and pressure, the ester exchange reaction of acrylonitrile and methanol produces methacrylonitrile and water.
3. It is necessary to control the temperature and pressure during the reaction to ensure the smooth progress of the reaction and the quality of the product.
4. Through the separation and purification of the reaction solution, the methacrylonitrile product with high purity is obtained.

3. post-treatment
After the
reaction is completed, the reaction solution needs to be post-treated to obtain a methacrylonitrile product that meets the requirements. The specific steps are as follows:

1. the reaction liquid is sent to a distillation column, and methacrylonitrile and water are separated by distillation.
2. Refining methacrylonitrile to remove impurities and moisture to obtain higher purity products.
3. Treat wastewater to meet environmental requirements.

4. precautions

In the manufacturing process of methacrylonitrile, the following matters need to be paid attention to:

1. Strictly control the quality and ratio of raw materials to ensure the smooth progress of the reaction and the quality of the product.
2. Control the reaction temperature and pressure to avoid the occurrence of side reactions and product decomposition.
3. Regular maintenance and maintenance of the equipment to ensure the normal operation and service life of the equipment.
4. Strengthen production safety management, comply with relevant laws and regulations, and ensure the safety and stability of the production process.

In short, the manufacture of methacrylonitrile requires strict raw material preparation, scientific reaction process and fine post-processing, while paying attention to safe production and environmental protection requirements. Only in this way can we produce high-quality methacrylonitrile products and contribute to the development of the chemical production field.

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