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[Chemical Knowledge]：Production and manufacturing method and process flow of refined naphthalene

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The manufacturing method
of refined naphthalene
1. Introduction

refined naphthalene is an important chemical production raw material, widely used in dyes, medicine, pesticides, plastics and other fields. This paper will introduce the manufacturing method of refined naphthalene, including raw material selection, reaction principle, process flow, equipment selection and so on.

2. raw material selection

refined naphthalene manufacturing raw materials are mainly coal tar and petroleum phenol. Among them, the content of naphthalene in coal tar is higher, but the impurities are also more; the content of naphthalene in petroleum phenol is lower, but the impurities are less. Therefore, when selecting raw materials, it is necessary to make a trade-off according to the actual situation to ensure the quality and yield of refined naphthalene.

3. reaction principle

fine naphthalene is mainly produced by distillation, which uses the boiling point difference between the components to separate naphthalene from the mixture. In the distillation process, it is necessary to control the temperature and pressure to ensure the purity and yield of naphthalene. At the same time, the distillation residue needs to be treated to avoid environmental pollution.

4. Process
The manufacturing process of
refined naphthalene mainly includes the following steps:

1. Raw material pretreatment: coal tar or petroleum phenol is dehydrated and desulfurized to ensure the quality and stability of raw materials.

2. Distillation: The pretreated raw material is heated and distilled, and the temperature and pressure are controlled to separate naphthalene from the mixture.

3. Cooling crystallization: The naphthalene obtained by distillation is crystallized by cooling and further purified.

4. Centrifugal separation: The crystallized naphthalene is centrifuged to obtain refined naphthalene with high purity.

5. Drying packaging: drying the refined naphthalene after centrifugation, and then packaging for storage.

5. equipment selection

In the manufacturing process of refined naphthalene, it is necessary to select appropriate equipment to ensure production efficiency and product quality. The following is the selection of some key equipment:

1. distillation kettle: choose high temperature resistant, corrosion resistant material, in order to ensure the service life of the equipment and product quality. At the same time, it is necessary to control the temperature and pressure of the distillation kettle to avoid safety accidents.

2. Crystallization tank: Choose a crystallization tank with stirring and cooling functions to improve crystallization efficiency and product quality.

3. Centrifuge: Choose a high-speed and high-efficiency centrifuge to ensure the effect and efficiency of centrifugal separation.

4. Drying equipment: Select hot air circulation oven and other drying equipment to control the drying temperature and humidity to ensure product quality.
Precautions for
6.

In the manufacturing process of refined naphthalene, the following matters need to be paid attention to:

1. Control the quality and stability of raw materials to avoid the impact on the production process and product quality.

2. Strictly control the distillation temperature and pressure to avoid safety accidents and product quality degradation.

3. Regular maintenance and maintenance of the equipment to ensure the normal operation and service life of the equipment.

4. Monitor and record the production process, find and solve problems in time, and ensure product quality and production efficiency.

7. conclusion

refined naphthalene as an important raw material for chemical production, its manufacturing method needs to strictly control the quality and stability of raw materials, reaction conditions and equipment selection. At the same time, it is necessary to pay attention to safety, environmental protection and quality issues in the production process to ensure product quality and yield.

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