萘,又稱并萘,是一種無色有光澤的片狀結晶。不溶于水,易升華,能隨水蒸氣揮發,有特殊氣味。是工業上重要的稠環芳烴,可用于生產苯酐、染料的中間體、橡膠助劑和殺蟲劑。

　　Naphthalene, also known as naphthalene, is a colorless and glossy plate-like crystal. Insoluble in water, easily sublimates, can evaporate with water vapor, and has a special odor. It is an important polycyclic aromatic hydrocarbon in industry, which can be used as an intermediate in the production of phthalic anhydride, dyes, rubber additives, and insecticides.

　　根據純度不同,萘可分為工業萘和精萘。工業萘的純度一般約為96%。工業萘進一步提純脫除雜質及脫硫后,可得到高純度的精萘。精蔡的純度約為99.5%。

　　According to different purities, naphthalene can be divided into industrial naphthalene and refined naphthalene. The purity of industrial naphthalene is generally about 96%. After further purification and desulfurization of industrial naphthalene, high-purity refined naphthalene can be obtained. The purity of Jingcai is about 99.5%.

　　精萘：英文名為Refined naphthalene,分子式為:C10H8,分子量為:128.16,CAS號:91-20-3,外觀:為白色易揮發晶體,有溫和芳香氣味,粗萘有煤焦油臭味;蒸汽壓 0.13kPa/52.6℃ 閃點:80℃;熔點 80.1℃ 沸點217.9℃;不溶于水,溶于無水乙醇、醚、苯,相對密度(水=1)1.16;相對密度(空氣=1)4.42;穩定性:穩定;主要用途:用于制造染料中間體、皮革、木材保護劑等。

　　Refined naphthalene: English name: Refined naphthalene, molecular formula: C10H8, molecular weight: 128.16, CAS number: 91-20-3, appearance: white volatile crystals, mild aromatic odor, crude naphthalene has a coal tar odor; Steam pressure 0.13kPa/52.6 ℃ Flash point: 80 ℃; Melting point 80.1 ℃ Boiling point 217.9 ℃; Insoluble in water, soluble in anhydrous ethanol, ether, and benzene, with a relative density (water=1) of 1.16; Relative density (air=1) 4.42; Stability: Stable; Main use: Used for manufacturing dye intermediates, leather, wood protectants, etc.

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