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[Chemical Knowledge]：Production method and process flow of butyl tert-butyl acetophenone

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Butyl tert-Butyl Ketone (BTBP) is an important raw material for chemical production, which is widely used in fine chemical industry, medicine, pesticide and other fields. This article will introduce the manufacturing method of butyl tert-butyl acetophenone, including raw material preparation, reaction process, post-treatment and other links.

1. Raw Material Preparation

The main raw materials for the manufacture of butyl tert-butyl acetophenone are acetophenone, isobutylene and tert-butanol. Among them, acetophenone can be prepared by reacting benzene with acetic anhydride, isobutylene can be prepared by naphtha cracking or propylene dimerization, and tert-butanol can be prepared by isobutylene hydration.

2. reaction process

1. Friedel-Crafts acylation reaction
of acetophenone and isobutylene in the presence of acidic catalysts (such as sulfuric acid, hydrofluoric acid, etc.). The reaction is an exothermic reaction, and the reaction temperature needs to be controlled. At the same time, attention should be paid to the amount and type of catalyst to avoid excessive formation of by-products.
2. Alcoholysis Reaction
The alcoholysis reaction of tert-butylacetophenone and tert-butanol in the presence of an acidic catalyst produces butyl tert-butylacetophenone. The reaction is also an exothermic reaction, the reaction temperature needs to be controlled, and the amount and type of catalyst need to be paid attention to to ensure the selectivity and yield of the reaction.

3. post-treatment
After the
reaction is completed, post-treatment, including distillation, washing, drying and other steps, is required to obtain pure butyl tert-butyl acetophenone product. Among them, distillation is to separate unreacted raw materials and by-products, washing is to remove residual catalyst and impurities, and drying is to remove moisture to ensure the quality of the product.

4. precautions

1. During the operation, it is necessary to pay attention to control the reaction temperature and the amount of catalyst to avoid the formation of by-products and equipment corrosion.
2. In the post-processing process, it is necessary to ensure the purity and quality of the product to avoid the impact on downstream products.
3. In the production process, attention should be paid to safety to avoid accidents such as fire and explosion.

In summary, the process for producing butyl tert-butylacetophenone requires a number of steps, including raw material preparation, reaction process and post-treatment, etc. During the operation, it is necessary to pay attention to controlling the reaction conditions and operating parameters to ensure the quality and yield of the product. At the same time, it is also necessary to pay attention to safety and production environmental protection to avoid the impact on personnel and the environment.

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