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

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Manufacturing Method
of Xylene
Xylene is a colorless transparent liquid with unpleasant odor. Insoluble in water, can be mixed with alcohol, ether, acetone, benzene and other organic solvents. It is a flammable and toxic chemical used primarily as a solvent and in synthetic coatings. The following are the main manufacturing methods of xylene.

1. Catalytic reforming method

catalytic reforming method is a method that uses naphtha as raw material and converts naphtha into aromatic hydrocarbons under high temperature and pressure through the action of a catalyst. In this process, the alkanes and cycloalkanes in the naphtha react through dehydrogenation, cyclization and the like to produce aromatic hydrocarbons such as benzene, toluene and xylene. The ratio of xylene in the product can be controlled by adjusting the reaction conditions and the type of catalyst.

2. Methylation method

Methylation method is a method that uses toluene as raw material and generates xylene under the action of a catalyst by adding a methylation reagent (such as methanol, dimethyl ether, etc.). In this process, the methyl group in toluene is replaced by a methylating agent to produce xylene. The advantages of the methylation method are that the raw materials are readily available and the operation is simple, but the purity of the produced xylene is low and further purification is required.

3. alkylation

alkylation is a kind of benzene and methanol as raw materials, through the alkylation reaction of xylene. In this process, benzene reacts with methanol in the presence of an acidic catalyst to form xylene. The advantage of the alkylation method is that the xylene produced is of high purity, but the reaction conditions are harsh, requiring high temperature and high pressure.

No matter which method is used to manufacture xylene, it is necessary to strictly abide by the safety production specifications to ensure the safety and stability of the production process. At the same time, strict quality testing is also required for the generated xylene to ensure that its purity and quality meet relevant standards.

In short, there are many manufacturing methods of xylene, and each method has its advantages and disadvantages and scope of application. When choosing a manufacturing method, you need to consider comprehensively according to the actual situation and choose the most suitable method. At the same time, it is necessary to strictly abide by the safety production specifications in the production process to ensure the safety and stability of the production process.

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