Manufacturing Method of Methyl Acetate
Methyl acetate is an important organic chemical raw material, which is widely used in the fields of medicine, pesticide, plastics and spices. Therefore, it is of great practical significance to study the manufacturing methods of methyl acetate. In this paper, we will introduce the manufacturing methods of methyl acetate, including esterification method, dimethyl carbonate method, methanol carbonylation method and so on.
1. Esterification
Esterification is one of the commonly used methods to produce methyl acetate. The method involves the esterification of methanol and acetic acid in the presence of a catalyst to produce methyl acetate and water. Commonly used catalysts are sulfuric acid, hydrochloric acid and phosphoric acid. Among them, sulfuric acid catalyst has high activity, but the equipment corrosion is more serious, requiring frequent maintenance and replacement. Hydrochloric acid catalyst activity is lower, but the equipment corrosion is lighter. Phosphoric acid catalyst activity is moderate, equipment corrosion is also lighter. The production process of
esterification method is as follows: mix methanol and acetic acid in a certain proportion, add catalyst and heat the reaction in the reactor. At the end of the reaction, methyl acetate and water are separated by distillation, and the product of methyl acetate with high purity is obtained.
2. Dimethyl Carbonate Method
Dimethyl Carbonate Method is a new method of manufacturing methyl acetate. In this method, dimethyl carbonate is transesterified with methanol to produce methyl acetate and dimethoxymethane. The advantages of this method are that the reaction conditions are mild, the catalyst is non-toxic and harmless, and the reaction products do not need to be separated. However, dimethyl carbonate is a toxic and hazardous chemical with high requirements for equipment and operation. The production process of
Dimethyl Carbonate method is as follows: mix dimethyl carbonate and methanol in a certain proportion, add catalyst and heat the reaction in a reactor. After the reaction, methyl acetate and dimethoxymethane are separated by distillation, and the product of methyl acetate with high purity is obtained.
3. Methanol Carbonylation
Methanol carbonylation is a method for the direct synthesis of methyl acetate. The method involves the carbonylation of methanol and carbon monoxide in the presence of a catalyst to produce methyl acetate directly. The advantages of this method are simple process, high product purity, and non-toxic and harmless catalyst. However, the method requires high-temperature and high-pressure reaction conditions, and has high requirements for equipment and operation. The production process of
methanol carbonylation method is as follows: methanol and carbon monoxide are mixed in a certain proportion, a catalyst is added, and the carbonylation reaction is carried out in a high-temperature and high-pressure reactor. After the reaction, the product of methyl acetate with higher purity is obtained through cooling and separation.
In short, there are various methods for manufacturing methyl acetate, and different methods have different advantages and disadvantages and applicable scope. When choosing the manufacturing method, it is necessary to make comprehensive consideration according to the actual situation and choose the process route that suits you. At the same time, you need to pay attention to safety and environmental protection in the production process, comply with relevant laws and regulations and standard requirements to ensure product quality and production safety.
