Manufacturing method of diethylbenzene
I. Introduction
Diethylbenzene is an important organic chemical raw material, which is widely used in the fields of medicine, pesticide, spice, dye and so on. With the continuous development of science and technology, the manufacturing method of diethylbenzene has been improved.
II. Manufacturing Methods
1. Alkylation Method
Alkylation method is a common method to manufacture diethylbenzene, which mainly takes ethylbenzene as raw material, and carries out alkylation reaction with ethylene to generate diethylbenzene. The 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
The advantages of the alkylation method are that the raw materials are easily available, the reaction conditions are mild, and the operation is simple. However, the method also has some disadvantages, such as catalyst corrosion equipment, waste acid treatment difficulty, environmental pollution.
2. Dehydrogenation
Dehydrogenation is a method of preparing diethylbenzene by dehydrogenation reaction using ethylbenzene as raw material. The reaction is usually carried out at high temperature and high pressure, and requires the use of precious metal catalysts, such as platinum and palladium.
Reaction equation: 2C6H5CH3 → C6H5CH2CH2CH3 + H2
The advantage of the dehydrogenation method is the high purity of the product and the high yield. However, the method has large investment in equipment, harsh operating conditions, short catalyst life and high maintenance cost.
3. Distillation
Distillation is a method of preparing diethylbenzene by separating a mixture of ethylbenzene and diethylbenzene. The method mainly utilizes the difference in boiling points between the two and separates diethylbenzene from the mixture by means of distillation. The advantages of the
distillation method are small investment in equipment, simple operation, and no need for a catalyst. However, the method has high energy consumption, low yield, and product quality is affected by the purity of raw materials.
Third, manufacturing process optimization
Aiming at the shortcomings of the above manufacturing methods, the manufacturing process can be optimized to improve the yield and purity of diethylbenzene, and reduce the production cost and environmental pollution. The following are some optimization measures:
1. Adopting new catalyst
Adopting new catalyst can improve the activity and selectivity of alkylation reaction, reduce the generation of by-products, and improve the product purity. At the same time, it can reduce the corrosion of the catalyst on the equipment and environmental pollution.
2. Optimize the reaction conditions
By adjusting the conditions of reaction temperature, pressure, air velocity, etc., the selectivity and yield of dehydrogenation reaction can be improved, and the energy consumption and catalyst consumption can be reduced.
3. Enhance separation technology
Adopting more advanced separation technology, such as extraction, adsorption, etc., can improve the separation effect of diethylbenzene and impurities, and improve the purity of the product.
4. Conclusion
Diethylbenzene is an important organic chemical raw material, and its manufacturing methods mainly include alkylation, dehydrogenation and distillation. For the shortcomings of these methods, the manufacturing process can be optimized to improve the product yield and purity, and reduce the production cost and environmental pollution. In the future, with the continuous progress of science and technology, the manufacturing methods of diethylbenzene will be more perfect and optimized.
