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[Chemical Knowledge]：Methacrylic acid production manufacturing method and process flow

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Methacrylic acid manufacturing method

Methacrylic acid (Methacrylic acid, referred to as MAA) is an important organic chemical raw material, widely used in polymer synthesis, coatings, adhesives, fibers, pharmaceuticals and other fields. This paper will introduce the manufacturing method of methacrylic acid, focusing on its production process, raw material selection and operating conditions. The manufacturing process of

1. methacrylic acid The manufacturing process of

methacrylic acid mainly has the following methods:

1. Acetone cyanohydrin method
2. Acetylene method
3. Isobutylene oxidation method

2. acetone cyanohydrin method
Acetone cyanohydrin method
is based on acetone, hydrocyanic acid and sulfuric acid as raw materials, after reaction to produce methacrylic acid. The process comprises the following steps:

1. reaction of acetone with hydrocyanic acid in the presence of sulphuric acid to acetone cyanohydrin.
2. Acetone cyanohydrin is hydrolyzed in the presence of sulfuric acid to give methacrylic acid.

the raw materials of this method are easy to obtain and the process is mature, a large amount of waste water is produced in the production process, and the environmental protection pressure is high. In addition, this method requires the use of highly corrosive reagents such as sulfuric acid, which requires high equipment.

3. acetylene method

acetylene method is acetylene, methanol and sulfuric acid as raw materials, after reaction to produce methacrylic acid. The process comprises the following steps:

1. Acetylene is reacted with methanol in the presence of sulfuric acid to form ethynylmethanol.
2. Hydrolysis of ethynylmethanol in the presence of sulfuric acid to give methacrylic acid.

of the method, the raw materials are easily available and the reaction conditions are mild, the yield is low, and a large amount of energy and raw materials are required.

4. isobutylene oxidation method

isobutylene oxidation method is based on isobutylene as raw material, after oxidation reaction to produce methacrylic acid. The process comprises the following steps:

1. oxidation of isobutylene with air in the presence of a catalyst to methacrolein.
2. Methacrolein is further oxidized to methacrylic acid.

This method has rich raw materials, high yield and good product quality, and is a widely used method for manufacturing methacrylic acid at home and abroad.

5. the effect of operating conditions on the manufacture of methacrylic acid

In the manufacture of methacrylic acid, operating conditions have an important impact on the yield and quality of the product. The following are some key operating conditions:

1. Temperature: Appropriate temperature can promote the reaction and increase the yield. However, too high temperature will lead to increased side reactions, affecting product quality.
2. Pressure: The change of pressure can affect the reaction rate and balance. It is necessary to choose the appropriate pressure according to different reaction systems and process conditions.
3. Catalyst: The choice and use of catalyst has an important influence on the rate and selectivity of the reaction, and it is necessary to select the appropriate catalyst according to different reaction systems and process conditions.
4. Raw material purity: Impurities in raw materials will adversely affect the reaction, and it is necessary to ensure the purity and quality of raw materials.

6. Conclusion There are many methods for the manufacture of

methacrylic acid, among which the isobutylene oxidation method is widely used at present. In the operation process, it is necessary to select the appropriate operating conditions according to different process conditions and raw materials to ensure the yield and quality of the product. At the same time, it is also necessary to strengthen environmental management, reduce waste emissions in the production process, and improve the environmental protection of the production process.

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