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

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The manufacturing method
of isomeric xylene
1. Introduction

Isomeric xylene is an important raw material for the production of chemical products, which is widely used in plastics, rubber, fibers, solvents and fuels. With the continuous development of industrial technology, the demand for isomeric xylene is increasing year by year. Therefore, it is of great significance to study the manufacturing method of isomeric xylene for improving production efficiency, reducing costs and promoting industrial development. This paper will introduce the manufacturing method of isomeric xylene in detail, including raw material selection, reaction principle, process flow, equipment selection and so on.

2. raw material selection

isomeric xylene manufacturing raw materials mainly include benzene, toluene and mixed carbon four. Among them, benzene is a common chemical raw material with a wide range of sources and a relatively low price; toluene is also a common chemical raw material and can be used as a substitute for benzene; mixed carbon four is a common by-product of the petrochemical industry, which is rich in carbon Four components. According to different raw material sources and production cost considerations, different raw materials can be selected for the production of isomeric xylene.

3. reaction principle The manufacturing method of

isomeric xylene mainly adopts the alkylation reaction principle, that is, benzene and toluene or the olefin component in the mixed carbon four are alkylated to generate isomeric xylene. Alkylation reaction is an acid-base catalyzed reaction process, commonly used catalysts include sulfuric acid, hydrofluoric acid, phosphoric acid and other acidic catalysts and alkaline catalysts. In the role of acidic catalyst, benzene and olefin electrophilic substitution reaction, the formation of alkyl benzene; and in the role of alkaline catalyst, benzene and olefin nucleophilic substitution reaction, also generated alkyl benzene. Different catalysts and reaction conditions will affect the selectivity and yield of the product.

4. Process
The manufacturing process of
isomeric xylene mainly includes the steps of raw material pretreatment, alkylation reaction, product separation and purification. The specific process is as follows:

1. Raw material pretreatment: the raw material for desulfurization, dehydration and other pretreatment, in order to ensure the smooth progress of the reaction.
2. Alkylation reaction: the pretreated raw material is mixed with the catalyst, and the alkylation reaction is carried out under appropriate temperature and pressure to produce isomeric xylene and other by-products.
3. Product separation: through distillation, extraction and other separation methods, the isomeric xylene is separated from other by-products.
4. Refining: Refining the isolated isomeric xylene to remove impurities and obtain a product with high purity.

5. equipment selection

In the manufacturing process of heterogeneous xylene, the reactors, separation towers, pumps, valves and other equipment that need to be used should be selected according to the requirements of the process and the actual situation. Specifically, the reliability, corrosion resistance, sealing and other aspects of the equipment should be considered to ensure the normal operation of the equipment and the quality of the product.

6. conclusion

isomeric xylene as an important raw material for chemical production, its manufacturing method is of great significance for improving production efficiency, reducing costs and promoting industrial development. In the manufacturing process, appropriate raw materials and catalysts should be selected according to the actual situation, and the process flow and equipment selection should be optimized to improve product quality and yield. At the same time, we should also strengthen the safety management and environmental protection measures in the production process to ensure the smooth progress of production and sustainable development.

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