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

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The manufacturing method
of m-xylene
1. Introduction

m-xylene is an important chemical raw material, widely used in medicine, pesticides, dyes, spices and other fields. Therefore, it is of great significance to study the manufacturing method of m-xylene for improving production efficiency, reducing costs and promoting industrial development. This paper will introduce the manufacturing method of m-xylene, including raw material selection, reaction principle, process flow, equipment selection and so on.

2. feedstock selection

m-xylene manufacturing feedstock mainly includes benzene, methanol and catalyst. Among them, benzene is a common chemical raw material with a wide range of sources and a relatively low price; methanol, as an alcohol compound, is also widely used in chemical production; the choice of catalyst has an important impact on reaction efficiency and product selectivity, so it is necessary to choose a catalyst with high activity and good selectivity.

3. reaction principle

m-xylene manufacturing reaction principle is mainly through benzene and methanol in the role of the catalyst, the occurrence of alkylation reaction of xylene mixture, and then through the separation and purification of m-xylene. The specific reaction equation is as follows:

C6H6 CH3OH → C6H4(CH3)2 H2O

4. Process

The manufacturing process of m-xylene mainly includes the following steps:

1. Ingredients: mix benzene and methanol in a certain proportion, add catalyst and stir evenly.
2. Reaction: The mixed material is heated to a certain temperature for alkylation reaction to generate xylene mixture.
3. Separation: The reaction product was cooled to room temperature and m-xylene and other mixtures were separated by distillation.
4. Purification: The separated m-xylene is further purified to obtain a product with higher purity.

5. equipment selection

In the manufacturing process of m-xylene, the equipment that needs to be used includes batching tanks, reactors, distillation columns, purification equipment, etc. In order to ensure production efficiency and product quality, it is necessary to select equipment with stable performance and convenient operation. At the same time, considering the safety and environmental protection of chemical production, it is also necessary to select equipment that meets relevant standards.

6. operating points

In the manufacturing process of m-xylene, the following operating points need to be paid attention to:

1. The proportion of ingredients should be accurate to avoid waste and unstable product quality.
2. The selection and use of catalyst should be reasonable to ensure the reaction efficiency and product selectivity.
3. The reaction temperature and time should be properly controlled to avoid excessive reaction and formation of by-products.
4. The separation and purification process should be standardized to ensure product purity and yield.

7. safety and environmental protection measures

In the manufacturing process of m-xylene, the following safety and environmental protection measures need to be taken:

1. Strictly abide by relevant safety operation procedures to ensure the safety of employees and equipment.
2. Strengthen the treatment of waste gas, waste water and other pollutants to reduce the impact on the environment.
3. Take effective protective measures to reduce the harm to operators.

8. conclusion

m-xylene as an important chemical raw material, its manufacturing method is of great significance for improving production efficiency, reducing costs and promoting industrial development. In the actual production process, it is necessary to select the appropriate raw materials, reaction principle, process flow and equipment selection according to the specific situation, and pay attention to the operation points and the implementation of safety and environmental protection measures, so as to ensure the production efficiency and product quality, and reduce the harm to the environment and human body.

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