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

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Methyl acetate is a common esterification product, which has a wide range of uses, such as solvents, inks, lubricants and food additives. Therefore, the production of methyl acetate is of great significance in the industrial and chemical fields. This article will introduce the production process and preparation method of methyl acetate.

1. Methyl Acetate Production Process

Methyl Acetate production process mainly includes two steps: esterification reaction and separation and purification.

1. esterification reaction

esterification reaction is a kind of acid catalyzed reaction, commonly used acid catalyst is sulfuric acid, hydrochloric acid and phosphoric acid. The reaction starting materials include acetic acid and methanol, and the reaction can be carried out in a reactor under appropriate catalyst and conditions. The reactor is usually a tower reactor, and the reaction tower is provided with two layers of esterification and separation, and the product after the reaction can be separated by gravity separation in the separation layer.

2. separation and purification

separation and purification is an important process of methyl acetate production. The separated product contains impurities and unreacted starting materials and needs to be purified by distillation techniques at this stage. In the distillation process, a fractionation tower is used to separate impurities and unreacted raw materials from the product to improve the purity of the product.

2. Methyl acetate Preparation method

1. Sulfuric acid catalytic

Sulfuric acid catalytic method is a common method for the preparation of methyl acetate. The preparation process is to mix acetic acid and methanol into the reactor, and then add an appropriate amount of sulfuric acid as a catalyst, control the reaction temperature between 60 ℃-70 ℃ for esterification reaction. After completion of the reaction, the methyl acetate product was finally obtained through a separation and purification process.

2. Acid-base catalysis

Acid-base catalysis is a simple and efficient method for the preparation of methyl acetate. The preparation process is to mix acetic acid and methanol, add a certain amount of sodium hydroxide as alkali catalyst, control the reaction temperature between 35 ℃-50 ℃ for esterification reaction. After completion of the reaction, the methyl acetate product was finally obtained through a separation and purification process.

3. solid acid catalytic method

solid acid catalytic method is a green and environmental protection method for the preparation of methyl acetate. The preparation process is to add a catalyst to the vinegar, the usually used catalyst is ion exchange resin or molecular sieve, and then add methanol, control the reaction temperature between 60 ℃-70 ℃ for esterification reaction. After completion of the reaction, the methyl acetate product was finally obtained through a separation and purification process.