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

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The manufacturing method
of cumene
Cumene is an important organic chemical raw material, which is widely used in the production of phenol, acetone and other chemical products. This article will introduce the manufacturing method of cumene, including raw material preparation, reaction process, post-treatment and precautions.

1. Raw Material Preparation

The main raw materials for the manufacture of cumene are benzene and propylene. In order to ensure the smooth progress of the reaction, the raw materials need to be pre-treated. First, benzene should be purified by distillation to remove impurities. Secondly, the propylene should be dried to avoid the effect of moisture on the reaction.

2. reaction process

The manufacturing process of cumene mainly uses alkylation reaction. The specific steps are as follows:

1. mix benzene and propylene according to a certain proportion, and add an appropriate amount of catalyst. Commonly used catalysts include sulfuric acid, hydrofluoric acid, etc.
2. The mixed material is heated to a certain temperature, usually in the range of 100-150°C. At this temperature, propylene and benzene are alkylated to produce cumene.
3. It is necessary to maintain a certain pressure during the reaction to promote the reaction. Pressures in the range of 1-2MPa are usually employed.

3. post-treatment
After completion of the
reaction, the product needs to be post-treated to obtain pure cumene. The specific work-up steps were as follows:

1. Cooling: The reaction mixture was cooled to room temperature for the next operation.
2. Separation: Cumene is separated from unreacted benzene, propylene and catalyst by distillation or extraction.
3. Purification: The separated cumene is further distilled or crystallized to obtain a product with higher purity.

4. precautions

In the manufacturing process of cumene, the following matters need to be paid attention to:

1. The selection and use of catalysts: Different catalysts have different effects on the reaction, and it is necessary to choose the appropriate catalyst according to the actual situation. And strictly control its dosage.
2. Temperature and pressure control: Temperature and pressure are important factors affecting the reaction and need to be adjusted according to the actual situation to maintain the stability of the reaction.
3. Safety measures: flammable, explosive and toxic substances are involved in the process of manufacturing cumene, and corresponding safety measures need to be taken, such as setting up ventilation facilities and equipping fire prevention equipment.

In short, the manufacturing process of cumene needs to strictly control the conditions of each link to ensure the smooth progress of the reaction and the quality of the product. At the same time, it is necessary to strengthen safety management and prevent potential risks.

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