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[Chemical Knowledge]：Production and manufacturing method and process flow of acetic anhydride

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Manufacturing method
of acetic anhydride
acetic anhydride is an important organic chemical raw material, which is widely used in medicine, pesticide, dye, perfume and other fields. There are many methods for the manufacture of acetic anhydride, and the acetic acid cracking method is one of the methods widely used at home and abroad. This paper will introduce in detail the production process, operation process, raw material formula and equipment selection of acetic anhydride by acetic acid cracking method.

1. production process

of acetic acid cracking is a reaction process in which acetic acid is cracked to form acetic anhydride and water under high temperature and high pressure conditions under the action of a catalyst. The specific production process is as follows:

1. acetic acid and catalyst are added into the reactor, and the temperature is raised to the reaction temperature.
2. Under the condition of high temperature and high pressure, acetic acid is cracked to produce acetic anhydride and water.
3. The reaction product is condensed, separated, and distilled to obtain a higher purity acetic anhydride product.

2. Operation Process

1. Feeding: Acetic acid and catalyst are added to the reactor in a certain proportion.
2. Temperature increase: Raise the temperature of the reactor to the reaction temperature and maintain a constant temperature.
3. cracking: Under the condition of high temperature and high pressure, acetic acid is cracked to produce acetic anhydride and water.
4. Cooling: The reaction product is cooled to a certain temperature.
5. Separation: Acetic anhydride and water are separated by a separation device.
6. Rectification: Rectification of the separated acetic anhydride to obtain a higher purity acetic anhydride product.
7. Packaging: the product packaging storage.

3. raw material formula

acetic acid cracking method to manufacture acetic anhydride is the main raw material of acetic acid and catalyst. Among them, the quality of acetic acid has an important influence on the quality and yield of the product, so it is necessary to select acetic acid with higher purity as the raw material. The type and amount of the catalyst also need to be optimized according to the specific situation.

4. equipment selection

acetic acid cracking method to manufacture acetic anhydride needs to use the reactor, condenser, separation equipment and distillation equipment. When selecting equipment, it is necessary to consider factors such as production scale, product quality and production efficiency. At the same time, the material and anti-corrosion performance of the equipment also need to be considered to ensure the service life of the equipment and safe production.
Precautions for
5. production

1. Strictly control the reaction temperature and pressure to ensure the stability and safety of the reaction process.
2. The selection and dosage of catalyst need to be optimized according to the experimental data to improve the quality and yield of the product.
3. In the production process, the equipment needs to be maintained and maintained regularly to ensure the normal operation and service life of the equipment.
4. Reasonable treatment and utilization of wastes and by-products in the production process to reduce production costs and reduce environmental pollution.

In short, the acetic acid cracking method is an effective method for the manufacture of acetic anhydride, which has the advantages of simple production process, convenient operation and easy access to raw materials. In actual production, it is necessary to optimize the production process, operation process, raw material formula and equipment selection according to the specific situation, so as to improve the quality and yield of products, reduce production costs, and improve the economic and social benefits of enterprises.

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