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

Read： 513 Time：14months ago Source：Transform the World with Simplicity

Xylene is a widely used chemical raw material, especially in the field of solvent. The following are xylene manufacturing processes:

1. Catalytic Reforming Process
Catalytic reforming process is a commonly used xylene manufacturing process. The method uses naphtha or straight-run gasoline as a raw material, and under the action of a catalyst, a high-temperature reforming reaction is carried out to produce aromatic hydrocarbons, including xylene. By separation and purification, high purity xylene can be obtained from the reaction product. The catalytic reforming method has the advantages of easy availability of raw materials, large production scale and high product quality, so it is widely used in xylene production.

2. Methylation
The methylation method is a method in which toluene is used as a raw material and xylene is produced by a methylation reaction. In this method, toluene is reacted with a methylating agent such as methanol or formaldehyde in the presence of an acidic catalyst to produce xylene and water. Xylene can be obtained from the reaction product by separation and purification. Methylation method has the advantages of easy availability of raw materials, mild reaction conditions and high selectivity, but the problems of catalyst activity decline and equipment corrosion need to be solved.

3. disproportionation method
disproportionation method is a method of producing xylene by disproportionation of toluene under the action of an acidic catalyst. In this method, toluene is mixed with an appropriate amount of hydrogen, and then disproportionation reaction occurs under high temperature and pressure by the action of a catalyst to produce xylene and benzene. Xylene can be obtained from the reaction product by separation and purification. The disproportionation method has the advantages of easy availability of raw materials, mild reaction conditions and high selectivity, but it needs to improve the activity and stability of the catalyst.

The above are the three main manufacturing methods of xylene, and different methods have different advantages and disadvantages and scope of application. In actual production, the appropriate manufacturing method can be selected according to the specific raw material source, production scale and product requirements. At the same time, in order to improve the production efficiency and product quality of xylene, it is necessary to strengthen the optimization of production process and equipment maintenance.

In conclusion, as an important raw material for the production of chemicals, xylene is widely used in the field of solvents. High purity xylene can be obtained through different manufacturing methods, which provides important support for the development of the chemical industry.

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