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[Chemical Knowledge]：Manufacturing method and process flow of industrial naphthalene

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The manufacturing method
of industrial naphthalene
1. Introduction

Industrial naphthalene is an important raw material for the production of chemical products, widely used in dyes, pharmaceuticals, pesticides, plastics and other fields. The purpose of this paper is to explore the manufacturing method of industrial naphthalene, and analyze its production process, raw material requirements and operation points.

2. the nature and use of industrial naphthalene

industrial naphthalene is a colorless or slightly yellow crystalline solid with a special smell. It is insoluble in water, but easily soluble in organic solvents. Industrial naphthalene is mainly used in the production of phthalic anhydride, dye intermediates, pesticides, etc., and can also be used as additives for plastics, rubber and other polymer compounds.

3. industrial naphthalene manufacturing method

1. coal tar distillation
coal tar distillation method is the main method of making industrial naphthalene, the raw material for coal tar. Coal tar contains a large amount of naphthalene, and high purity industrial naphthalene can be obtained by distillation separation. The process flow of the method includes the steps of coal tar preheating, distillation, cooling crystallization, centrifugal separation and the like. During the operation, temperature, pressure and other parameters need to be controlled to ensure product quality and yield.

2. Catalytic dehydrogenation method
catalytic dehydrogenation method is a method of preparing industrial naphthalene by dehydrogenation reaction under the action of catalyst. This method has the advantages of mild reaction conditions and high product purity. The choice of catalyst has an important influence on the dehydrogenation reaction and the quality of the product, and the commonly used catalysts are alumina, zinc oxide and so on.

3. Distillation
rectification is a method for separating industrial naphthalene from coal tar or other naphthalene-containing raw materials through multiple distillation, crystallization, separation and other steps. This method can obtain products with higher purity, but the operation process is more complicated and the energy consumption is higher.

4. Raw material requirements and operating points

1. Raw material requirements The raw material coal tar
the coal tar distillation method should have a certain naphthalene content, and at the same time require a low content of impurities such as moisture and ash to ensure product quality and yield. The raw material naphthalene for catalytic dehydrogenation should have a high purity to avoid the influence of impurities on the reaction.

2. key points of operation
in coal tar distillation method, it is necessary to strictly control the distillation temperature and time, avoid the decomposition and polymerization of naphthalene at high temperature, and ensure the effect of crystallization and centrifugal separation. In the catalytic dehydrogenation process, it is necessary to select the appropriate catalyst and reaction conditions to ensure the dehydrogenation reaction and the purity of the product. In the distillation method, it is necessary to control the temperature, pressure and other parameters of each step to ensure the quality and yield of the product.

5. Conclusion The main manufacturing methods of

industrial naphthalene are coal tar distillation, catalytic dehydrogenation and distillation. Different methods have different advantages and disadvantages and scope of application, and the appropriate manufacturing method should be selected according to the actual situation. In the process of operation, it is necessary to strictly control the quality of raw materials and operating parameters to ensure product quality and yield.

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