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[Chemical Knowledge]：Propyl tert-butyl acetophenone production method and process flow

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Propyl tert-butyl acetophenone (PTBA) is an important chemical raw material, which is widely used in medicine, pesticide, spice and other fields. This article will introduce a method for the manufacture of propyl tert-butyl acetophenone.

1. raw materials and equipment

1. Raw materials: acetophenone, tert-butyl alcohol, propylene, catalyst (sulfuric acid or phosphoric acid)
2. Equipment: reactor, condenser, water separator, stirrer, thermometer, pressure gauge

2. manufacturing steps

1. Acetophenone and tert-butyl alcohol are added to the reactor according to a certain molar ratio and stirred evenly.
2. Add the catalyst, continue to stir, heat up to a certain temperature, and maintain a constant temperature reaction for a certain period of time.
3. During the reaction, generated water is separated by a water separator, and unreacted tert-butanol is recovered by a condenser.
4. After completion of the reaction, the reaction mixture was cooled to room temperature, poured into a separatory funnel, and washed with water until neutral.
5. The organic layer was dried over anhydrous sodium sulfate, filtered, and distilled to obtain crude propyl tert-butyl acetophenone.
6. The crude product was purified to obtain propyl tert-butyl acetophenone with high purity.

3. precautions

1. The amount of catalyst should be appropriate, too much will lead to equipment corrosion, too little will affect the reaction rate.
2. The reaction temperature and time should be controlled within a suitable range to ensure the yield and purity of the product.
3. During the washing and drying process, it should be ensured that the product is fully in contact with the detergent and desiccant to achieve a better washing and drying effect.

4. safety and environmental protection

1. In the production process, the safety operation procedures should be strictly observed to ensure the safety of employees and equipment.
2. The waste water, waste gas and other pollutants should be properly treated to meet the national environmental protection standards.

5. Conclusion

The propyl tert-butyl acetophenone manufacturing method introduced in this paper has the advantages of easy access to raw materials, simple operation and high yield, and is suitable for industrial production. At the same time, safety and environmental management should be strengthened in the production process to ensure product quality and environmental friendliness.

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