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

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The manufacturing method
of diethylbenzene
1. Introduction

diethylbenzene is an important chemical production raw material, widely used in medicine, pesticides, spices, dyes and other fields. With the continuous development of science and technology, the manufacturing method of diethylbenzene is also constantly improved and optimized. This paper will introduce the manufacturing method of diethylbenzene, including raw material selection, reaction principle, process flow, equipment selection and so on.

2. raw material selection

manufacturing diethylbenzene is the main raw material of benzene and ethylene. Benzene is a common organic compound with good stability and chemical reactivity. Ethylene is a simple olefin with active chemical properties and can be alkylated with benzene to form diethylbenzene.

3. reaction principle

The production of diethylbenzene is mainly achieved by the alkylation reaction of benzene and ethylene. In the presence of an acidic catalyst, ethylene and benzene undergo an electrophilic substitution reaction to produce diethylbenzene. Commonly used acidic catalysts include sulfuric acid, hydrofluoric acid, phosphoric acid, and the like. Among them, sulfuric acid is the most commonly used catalyst because of its high catalytic activity and low cost.

4. Process

The manufacturing process of diethylbenzene mainly includes the following steps:

1. Raw material mixing: mixing benzene and ethylene in a certain proportion to form a reaction raw material.
2. Catalytic reaction: Add the mixed raw materials into the reactor, add the acidic catalyst, control the temperature and pressure, and carry out the alkylation reaction.
3. Product separation: After the reaction, the reaction product is separated to obtain diethylbenzene and other by-products.
4. Product refining: Refine the obtained diethylbenzene to remove the impurities and obtain a product with high purity.

5. equipment selection

In the manufacturing process of diethylbenzene, reactors, separators, refining towers and other equipment are needed. When selecting equipment, it is necessary to consider factors such as production scale, product purity, and operating conditions. At the same time, it is also necessary to consider the corrosion resistance, sealing, safety and other requirements of the equipment.

6. operation precautions

In the manufacturing process of diethylbenzene, the following operation precautions need to be paid attention to:

1. Strictly control the reaction temperature and pressure to avoid overheating, overpressure and other dangerous situations.
2. Regularly check the operation of the equipment to ensure the normal operation of the equipment and avoid leakage, failure and other problems.
3. Strengthen the quality control of raw materials to ensure the purity and quality of raw materials and avoid adverse effects on the reaction.
4. Operators need to be professionally trained and familiar with the manufacturing process and operating procedures to ensure production safety and quality stability.

7. conclusion

diethylbenzene as an important raw material for chemical production has a wide application prospect. In the manufacturing process, it is necessary to select appropriate raw materials, catalysts and technological processes, and at the same time strengthen equipment selection and operation management to ensure production safety and quality stability. With the continuous progress of science and technology, the manufacturing process of diethylbenzene will continue to optimize and improve, and make greater contributions to the development of the chemical industry.

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