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[Chemical Knowledge]：Manufacturing method and process flow of diethylbenzene

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Diethyl benzene manufacturing method

1. Introduction

Diethyl benzene is an important organic chemical 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 this paper will discuss its manufacturing method.

2. manufacturing methods

1. alkylation method

alkylation method is a common method for the manufacture of diethylbenzene, mainly ethylbenzene as raw material, alkylation reaction with ethylene to generate diethylbenzene. This reaction is usually carried out in the presence of an acidic catalyst. Commonly used catalysts include sulfuric acid and hydrofluoric acid.

reaction equation: C6H5CH3 C2H4 → C6H5CH2CH2CH3

alkylation method has the advantages of easy access to raw materials, mild reaction conditions and simple operation. However, this method also has some shortcomings, such as catalyst corrosion equipment, waste acid treatment is difficult, environmental pollution and so on.

2. dehydrogenation method

dehydrogenation method is a method for preparing diethylbenzene by dehydrogenation reaction of ethylbenzene as raw material. The reaction is usually carried out under high temperature and high pressure conditions, and it is necessary to use a noble metal catalyst, such as platinum, palladium, etc.

reaction equation: 2C6H5CH3 → C6H5CH2CH2CH3 H2

dehydrogenation method has the advantages of high product purity and high yield. However, this method has large equipment investment, harsh operating conditions, short catalyst life and high maintenance costs.

3. Rectification

rectification is a process for preparing diethylbenzene by separating a mixture of ethylbenzene and diethylbenzene. The method mainly uses the boiling point difference between the two to separate diethylbenzene from the mixture by distillation. The advantages of

distillation method are small equipment investment, simple operation and no need to use catalyst. However, this method has high energy consumption, low yield, and product quality is affected by the purity of raw materials.

3. manufacturing process optimization

In view of the shortcomings of the above manufacturing method, the manufacturing process can be optimized, the yield and purity of diethylbenzene can be improved, and the production cost and environmental pollution can be reduced. The following are some optimization measures:

1. The use of new catalyst

The use of new catalysts can improve the activity and selectivity of alkylation reactions, reduce the generation of by-products, and improve product purity. At the same time, the corrosion of the catalyst to the equipment and the environmental pollution can be reduced.

2. Optimization of reaction conditions

By adjusting the reaction temperature, pressure, space velocity and other conditions, the selectivity and yield of dehydrogenation reaction can be improved, and the energy consumption and catalyst consumption can be reduced.

3. Strengthen separation technology

adopt more advanced separation technology, such as extraction, adsorption, etc., which can improve the separation effect of diethylbenzene and impurities and improve product purity.

4. conclusion

diethylbenzene is an important organic chemical raw material, and its manufacturing methods mainly include alkylation, dehydrogenation and distillation. In view of the shortcomings of these methods, the manufacturing process can be optimized, the yield and purity of the product can be improved, and the production cost and environmental pollution can be reduced. In the future, with the continuous progress of science and technology, the manufacturing method of diethylbenzene will be more perfect and optimized.

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