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[Chemical Knowledge]：What are the upstream raw materials for refined naphthalene? What do the downstream products contain?

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As an important raw material for chemical production, refined naphthalene plays an important role in the chemical industry. Its upstream and downstream related products are numerous, forming a complete industrial chain. This article will detail the upstream and downstream related products of refined naphthalene.

upstream products:

1. Coal tar: Coal tar is the main raw material of refined naphthalene. Through distillation and separation processes, refined naphthalene can be extracted from coal tar.
2. petroleum brain: petroleum brain is also one of the raw materials for the production of refined naphthalene, which mainly comes from the light hydrocarbon mixture produced in the process of petroleum cracking.

downstream products:

1. Phthalic anhydride: fine naphthalene can react with maleic anhydride in the presence of sulfuric acid to generate phthalic anhydride. Phthalic anhydride is an important organic chemical raw material, which is widely used in the production of plasticizers, unsaturated polyester resins, alkyd resins, etc.
2. Methyl naphthalene: refined naphthalene can be alkylated with methanol under the action of a catalyst to generate methyl naphthalene. Methylnaphthalene is an excellent solvent and can also be used as a fuel additive and pesticide intermediate.
3. Naphthol: Refined naphthalene can be oxidized to naphthol. Naphthol and its derivatives are the raw materials of many important chemical products, such as dyes, pharmaceuticals, pesticides and so on.
4. Naphthylamine: Refined naphthalene can react with ammonia to form naphthylamine. Naphthylamine is an important organic intermediate, which can be used in the preparation of dyes, pharmaceuticals, pesticides and so on.

Through the above introduction, it can be seen that there are many upstream and downstream related products of refined naphthalene, forming a complete industrial chain. The production and application of these products involves many fields, such as chemical industry, medicine, pesticide, dye and so on. Therefore, refined naphthalene plays an important role in the field of raw materials for chemical production, and the development of its industrial chain also has an important impact on the development of the entire chemical industry.

the future, with the continuous progress and application of science and technology, there will be more and more upstream and downstream related products of refined naphthalene, and its industrial chain will be more perfect and rich. Therefore, strengthening the research and development of refined naphthalene and its related products and improving the quality and performance of the products will help to promote the sustainable development of the entire chemical industry.

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