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[Chemical Knowledge]：m-xylene. The production and manufacturing methods and processes of

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M-xylene manufacturing method

M-xylene (m-xylene) is an important chemical raw material, widely used in plastics, resins, dyes, pharmaceuticals and other fields. This paper will introduce the manufacturing method of m-xylene, including raw material selection, reaction principle, process flow, equipment selection and so on.

1. Raw Material Selection

The raw material for manufacturing m-xylene is mainly mixed xylene, which contains isomers such as m-xylene, o-xylene and p-xylene. In order to obtain high-purity m-xylene, it is necessary to select high-purity mixed xylene as a raw material, and the purity is generally required to be above 98%.

2. reaction principle

m-xylene manufacturing mainly uses adsorption separation method, the principle is the use of adsorbent adsorption capacity of different isomers, the mixed xylene m-xylene separation. Commonly used adsorbents are molecular sieve, silica gel, etc.

3. Process

m-xylene manufacturing process mainly includes the following steps:

1. Raw material pretreatment: mixed xylene dehydration, desulfurization and other pretreatment to ensure the quality of raw materials.

2. Adsorption and separation: The pretreated mixed xylene is passed into the adsorption tower, and the selective adsorption of the adsorbent to m-xylene is used to separate m-xylene from other isomers.

3. desorption regeneration: desorption regeneration of the adsorbent to restore the activity of the adsorbent for recycling.

4. product refining: refining the separated m-xylene to remove impurities and obtain high purity m-xylene products.

4. equipment selection

m-xylene manufacturing needs to use the following equipment:

1. adsorption tower: used for adsorption separation of m-xylene in mixed xylene.

2. Desorption tower: used for desorption regeneration of adsorbent.

3. Refining tower: used for refining m-xylene to remove impurities.

4. Pumps, valves, pipelines and other auxiliary equipment: used to transport and control materials.

5. operation points

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

1. Control the quality and purity of raw materials to ensure the quality and yield of products.

2. Control the type and particle size of the adsorbent to improve the effect of adsorption and separation.

3. Control the operating temperature and pressure of the adsorption tower to ensure the effect of adsorption and separation and the operation stability of the equipment.

4. Regenerate and replace the adsorbent regularly to maintain the activity and separation effect of the adsorbent.

6. safety and environmental protection measures

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

1. Strengthen the storage and transportation management of raw materials and products to avoid leakage and fire accidents.

2. Strengthen the maintenance and maintenance of production equipment to ensure the safety and stability of equipment operation.

3. Strengthen the management and emission control of production waste gas to reduce environmental pollution.

7. Conclusion

m-xylene as an important raw material for chemical production, its manufacturing method mainly uses adsorption separation method. In the manufacturing process, it is necessary to pay attention to the selection of raw materials, reaction principle, process flow, equipment selection and other aspects, while strengthening the management of operating points and safety and environmental protection measures to ensure product quality and yield, improve the economic and social benefits of enterprises.

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