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

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Butyl acetate is an organic compound, also known as butyl acetate. It is a colorless liquid with an aromatic taste that can be used as a solvent and as a fragrance. The production process and preparation method of butyl acetate have important industrial value, because it is a chemical widely used in chemical, pharmaceutical and food fields.

1. butyl acetate production process

butyl acetate production process is mainly divided into two steps: alcoholization and esterification.

alcoholization refers to the use of butanol as a raw material, which is dehydrated by heating to lose one molecule of water to generate butene and water, in which the assistance of a catalyst, such as sulfuric acid or H3PO4, is required to further process the generated butene (not described in detail in this article). Butyraldehyde can be obtained by oxidation of

butenes in steam or air, and the main butanol can be obtained by reduction. After butanol is obtained, the esterification reaction is carried out, and the reaction conditions need the assistance of a catalyst (such as aluminum acetate, etc.), because it can promote the esterification reaction and speed up the reaction. At the same time, the generated catalyst does not react with butyl acetate and can be recycled. A large number of examples can prove that aluminum acetate is the best catalyst.

2. butyl acetate preparation method

butyl acetate preparation method has a variety of, the following is one of the two specific methods:

1. acetic anhydride method

take a certain amount of butanol and acetic anhydride, into the reaction kettle, in the application of appropriate amount of catalyst (such as hydrochloric acid, etc.) under the condition of esterification reaction. During the course of the reaction, butyl acetate was distilled off, and the reaction was continued by gradually replenishing new raw materials by feeding under reduced pressure. Finally, the liquid obtained in the bottle was separated into pure butyl acetate by decompression and distillation.

2. acetic anhydride-methanol method

a certain amount of butanol, acetic anhydride and methanol into the reactor, adding a catalyst (such as phosphoric acid or aluminum acetate, etc.), in a certain reaction temperature and pressure reaction. After the reaction, the residue and the product were separated by distillation under reduced pressure. After cooling again, pure butyl acetate was obtained by means of distillation.

of the above two methods are able to better prepare butyl acetate, and different methods for the corresponding yield and purity are not the same, need to be selected according to actual needs.

3. Butyl acetate

Butyl acetate has a wide range of applications, such: