[Chemical Knowledge]：The nature, use, upstream and downstream raw materials, storage methods, refined naphthalene is what.

Naphthalene Properties

Refined naphthalene, the chemical name is pure naphthalene (Naphthalene), is an aromatic hydrocarbon with a chemical formula of C. It is white crystalline at room temperature, has a strong aromatic odor, and is commonly found in air fresheners and insect repellents. The molecular structure of refined naphthalene is composed of two adjacent benzene rings, which makes it have high chemical stability. Its melting point is 80.26 ° C, boiling point is 218 ° C, and the solubility in water is low, but soluble in alcohol, ether, chloroform and other organic solvents. Refined naphthalene is volatile and easily sublimates in air, which makes it particularly important in some applications.

Purposes of refined naphthalene

Refined naphthalene is widely used in industry and daily life. One of its most important uses is as an intermediate for the synthesis of dyes and resins. Many azo dyes and anthraquinone dyes are based on refined naphthalene. Refined naphthalene is also used in the manufacture of plasticizers, surfactants, pesticides, herbicides and some drugs. Due to its strong aromatic odor, refined naphthalene is also often used in the production of air fresheners and insect repellents, such as mothballs. The volatility and sublimation of refined naphthalene make it an ideal insect repellent because it can release gas without contacting the target to achieve insect repellent effects.

Refined Naphthalene Upstream Raw Material

The main upstream raw materials of refined naphthalene are coal tar and petroleum. Coal tar is a by-product of the coking process and contains a large amount of polycyclic aromatic hydrocarbons, including naphthalene. In the process of coal tar fractionation, crude naphthalene can be obtained by distillation, and then further refined to remove impurities to obtain refined naphthalene. Another source is the heavy fraction of petroleum. The naphthalene-containing fraction can be obtained by catalytic cracking and other processes, and then separated and refined. With the improvement of environmental protection requirements, biomass conversion technology has also been used to produce refined naphthalene in order to reduce the dependence on traditional fossil raw materials.

Refined Naphthalene Downstream Products

Refined naphthalene has a wide range of downstream products, covering a number of areas. In the dye industry, refined naphthalene is a key intermediate for a variety of dyes, such as disperse dyes and reactive dyes. In the plastics industry, refined naphthalene is used to produce plasticizers to improve the flexibility and durability of plastics. Refined naphthalene is also used in the production of synthetic resins, such as phenolic resins and polyester resins, which are widely used in coatings, adhesives and electronic materials. In the synthesis of pesticides and pharmaceuticals, refined naphthalene is also an indispensable intermediate for the synthesis of various effective pesticides and herbicides, as well as some pharmaceutical ingredients.

Refined Naphthalene Storage Method

Refined naphthalene is flammable and volatile, so its storage method requires special attention. Refined naphthalene should be stored in a cool, dry, well-ventilated place, away from fire and heat sources to prevent its sublimation and fire. Storage containers shall be closed metal containers to reduce volatilization and leakage. Because refined naphthalene has a certain toxicity, storage and operation personnel should wear protective equipment, such as gloves and masks, to avoid direct contact and inhalation. Refined naphthalene should be stored separately from strong oxidants to prevent the risk of chemical reactions. In the process of transportation, should follow the relevant dangerous goods transportation regulations to ensure safety.

Refined Naphthalene Market Status and Prospects

At present, the global refined naphthalene market is showing a steady growth trend, mainly due to the growth of downstream industry demand. Especially in the dye and plastics industries, the demand for refined naphthalene remains strong. The Asia-Pacific region is the main market for refined naphthalene consumption, especially China and India, which benefit from the industrialization process and infrastructure construction. With the increasingly stringent environmental regulations, the improvement of environmental protection technology in the production process of refined naphthalene and the research and development of new green production processes have become the focus of the industry. In the future, with the progress of technology and the change of market demand, the refined naphthalene industry is expected to continue to expand, especially in the development and application of high value-added products.

Refined Naphthalene Industry: Challenges and Opportunities

Although the refined naphthalene industry has broad prospects, it also faces some challenges. The first is the environmental problem. The traditional refined naphthalene production process will produce certain environmental pollution, and environmental protection measures and technical improvements need to be strengthened. Secondly, fluctuations in the supply of raw materials, especially coal tar and oil prices, will affect production costs. On the other hand, with the improvement of environmental awareness and technological progress, the development and utilization of biomass raw materials provides new opportunities for the refined naphthalene industry. The research and development of new materials and new processes have also opened up new areas for the application of refined naphthalene and improved its market competitiveness.

Conclusion

As an important chemical raw material, refined naphthalene has a wide range of applications and good market prospects. Although facing the challenges of environment and raw material supply, the refined naphthalene industry is expected to achieve sustainable development through technological innovation and improvement of environmental protection measures. With the continuous growth of downstream demand and the development of new application areas, refined naphthalene will continue to play an important role in the future chemical industry.