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[Chemical Knowledge]：Production and manufacturing method and process of methyl acetate

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Manufacturing method
of methyl acetate
Methyl acetate is an important organic chemical raw material, which is widely used in medicine, pesticide, perfume, dye and other fields. This paper will introduce the manufacturing methods of methyl acetate, including esterification, carbonyl synthesis, ethylene oxidation and so on.

1. esterification method

esterification method is one of the commonly used methods for the production of methyl acetate, mainly methanol and acetic acid as raw materials, in the role of catalyst for esterification reaction to obtain methyl acetate. The specific steps are as follows:

1. mix methanol and acetic acid according to a certain proportion, and add a catalyst, such as sulfuric acid or hydrochloric acid.
2. The esterification reaction is carried out at a certain temperature to generate methyl acetate and water.
3. Methyl acetate and water are separated by distillation to obtain methyl acetate with high purity.
the production process of
esterification is simple and easy to operate, the use of catalysts will bring problems such as equipment corrosion and wastewater discharge.

2. carbonyl synthesis

carbonyl synthesis is a more advanced method for the production of methyl acetate, mainly methanol, carbon monoxide and hydrogen as raw materials, in the presence of a catalyst for the carbonylation reaction to obtain methyl acetate. The specific steps are as follows:

1. methanol, carbon monoxide and hydrogen are mixed in a certain proportion, and a catalyst, such as a noble metal catalyst such as rhodium or ruthenium, is added.
2. The carbonylation reaction is carried out at a certain temperature and pressure to produce methyl acetate.
3. Methyl acetate and other by-products are separated by distillation to obtain methyl acetate with high purity.

carbonyl synthesis method has the advantages of high atomic utilization rate and high catalyst activity, but the catalyst cost is high, and the reaction conditions need to be strictly controlled.

3. Ethylene Oxidation Process

Ethylene oxidation process is a process in which ethylene is oxidized to produce acetic acid and then esterified with methanol to produce methyl acetate. The specific steps are as follows:

1. Mix ethylene and oxygen in a certain proportion, and add a catalyst, such as a metal catalyst such as silver or palladium.
2. The oxidation reaction is carried out at a certain temperature to generate acetic acid and water.
3. The generated acetic acid and methanol are mixed in a certain proportion, and a catalyst, such as sulfuric acid or hydrochloric acid, is added.
4. The esterification reaction is carried out at a certain temperature to generate methyl acetate and water.
5. Methyl acetate and water are separated by distillation to obtain methyl acetate with high purity.

ethylene oxidation method has the advantages of easy availability of raw materials and continuous production process, but the catalyst activity is low and needs to be replaced regularly.

To sum up, there are many manufacturing methods of methyl acetate, and different methods have different advantages and disadvantages and application occasions. When choosing a production method, you need to consider comprehensively according to the actual situation and choose the most suitable production method. At the same time, it is necessary to pay attention to safety, environmental protection and other issues in the production process to ensure the smooth progress of the production process.

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