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

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The manufacturing method
of o-xylene
o-xylene (ortho-xylene) is an important raw material for chemical production, which is widely used in the fields of plastics, fibers, solvents and pesticides. This paper will introduce the manufacturing method of o-xylene, including raw material selection, reaction principle, process flow, equipment selection and so on.

1. Raw Material Selection

The raw material for the manufacture of ortho-xylene is mainly mixed xylene (mixed xylenes), which contains ortho-, meta-and para-xylene isomers. Mixed xylenes can be obtained by methods such as petroleum cracking and coal tar separation. In order to ensure the purity of o-xylene, strict quality control of raw materials is required.

2. Reaction Principle

The production of ortho-xylene is mainly realized by isomerization reaction, that is, other isomers in mixed xylene are converted into ortho-xylene. The isomerization reaction can be carried out in the presence of an acidic catalyst. Commonly used catalysts include zeolite, alumina, etc. In the reaction process, the raw material mixed xylene is contacted with the catalyst, and the isomerization reaction takes place under suitable temperature and pressure conditions to generate o-xylene.

3. process

o-xylene manufacturing process mainly includes the following steps:

1. raw material pretreatment: mixed xylene dehydration, desulfurization and other pretreatment, in order to ensure the activity and life of the catalyst.
2. Reaction: The pretreated mixed xylene is mixed with the catalyst and sent to the reactor for isomerization reaction under suitable temperature and pressure conditions.
3. Product separation: The reaction product is cooled and separated to obtain o-xylene and other by-products.
4. Product refining: o-xylene is refined to remove impurities and obtain products with high purity.

4. equipment selection

In the manufacturing process of o-xylene, reactors, separators, coolers, pumps and other equipment are needed. In order to ensure the reliability and efficiency of the equipment, it is necessary to select the appropriate equipment model and material according to the characteristics of the process and the use environment of the equipment. At the same time, it is also necessary to consider the maintenance and maintenance of the equipment to ensure the long-term stable operation of the equipment.
Precautions for manufacturing
5.

In the manufacturing process of o-xylene, the following matters need to be paid attention to:

1. Strictly control the quality of raw materials to ensure that the impurity content in the raw materials meets the requirements to avoid the impact on the catalyst and product quality.
2. The selection and use of the catalyst need to be adjusted according to the actual situation to ensure the activity and life of the catalyst.
3. In the reaction process, it is necessary to strictly control the temperature, pressure and other parameters to ensure the stability of the reaction conditions and improve the selectivity of the product.
4. In the process of product separation and purification, it is necessary to select appropriate equipment and processes to ensure the purity and yield of the product.

In short, the manufacture of o-xylene requires a comprehensive consideration of raw materials, reaction principles, process flow, equipment selection and other factors to develop a suitable manufacturing program to ensure product quality and yield. At the same time, it is necessary to strengthen the quality control and safety management in the production process to ensure the smooth progress of the production process.

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