精萘(91-20-3)主要可用于皮革防霉，防腐。萘是工业上重要的稠环烃，主要用于生产苯酐各种萘酚萘胺等，是生产合成树脂增塑剂染料的中间体表面活性剂合成纤维涂料农药医药香料橡胶助剂和杀虫剂的原料。

Refined naphthalene (91-20-3) is mainly used for leather mold prevention and anti-corrosion. Naphthalene is the most important polycyclic hydrocarbon in industry, mainly used in the production of phthalic anhydride, various naphthols, naphthylamines, etc. It is an intermediate in the production of synthetic resin plasticizers, dyes, surfactants, synthetic fibers, coatings, pesticides, pharmaceuticals, fragrances, rubber additives, and insecticides as raw materials.

萘的用途分配，各国有所不同。用于生产苯酐的大致占70%，用于染料中间体和橡胶助剂的约占15%，杀虫剂的约占6%，鞣革剂的约占4%。用于生产杀虫剂的比例较大，主要是用于生产西维因。以萘为原料，经过磺化硝化还原胺化水解等单元操作，可制得多种中间体。精萘的应用还在拓宽，新产品“超级塑性材料”即萘磺酸盐甲醛缩合物，可用作水泥添加剂，增加混凝土的塑性变形而不降低其强度。今后几年需求量将以5-10%的速度增长。

The allocation of naphthalene uses varies among countries. Approximately 70% is used for the production of phthalic anhydride, 15% is used for dye intermediates and rubber additives, 6% is used for insecticides, and 4% is used for tanning agents. The United States has a large proportion of pesticides used for production, mainly for the production of carbaryl. Various intermediates can be prepared from naphthalene through unit operations such as sulfonation, nitration, reduction, amination, and hydrolysis. The application of refined naphthalene is still expanding, and the new product "superplastic material", namely naphthalene sulfonate formaldehyde condensate, can be used as a cement additive to increase the plastic deformation of concrete without reducing its strength. The demand will grow at a rate of 5-10% in the coming years.

工业萘的主要成份为有机化合物,是一种无色有光泽的片状结晶,根据纯度不同,萘可分为工业萘和精萘,工业萘的纯度一般约为96%,工业萘进一步提纯脱除杂质及脱硫后,可得到高纯度的精萘.

The main component of industrial naphthalene is organic compounds, which are colorless and glossy flake crystals. Depending on the purity, naphthalene can be divided into industrial naphthalene and refined naphthalene. The purity of industrial naphthalene is generally about 96%. After further purification, impurity removal, and desulfurization, high-purity refined naphthalene can be obtained

生产工业萘的主要设备

Main equipment for producing industrial naphthalene

精馏塔：工业萘精馏塔一般采用浮阀塔,浮阀板层50-70层,塔径按处理量的大小有800-1200mm.

Distillation tower: Industrial naphthalene distillation tower generally uses a floating valve tower, with 50-70 layers of floating valve plates and a tower diameter ranging from 800-1200mm according to the processing capacity

冷凝冷却器：冷凝冷却器是一个直径为1.2m,长为3.376m,冷却面积为122m2的列管式换热器,生产时冷却水走管内,萘蒸汽以138-140℃的温度从器顶进入管间换热后再以80-90℃的温度从器底呈液体流出,冷却水从器底进入,器上部以40-50℃温度流出

Condensing cooler: The condensing cooler is a tube and tube heat exchanger with a diameter of 1.2m, a length of 3.376m, and a cooling area of 122m2. During production, the cooling water flows through the tube, and naphthalene steam enters the tube to tube heat exchange at a temperature of 138-140 ℃ from the top of the condenser. After that, it flows out as a liquid at a temperature of 80-90 ℃ from the bottom of the condenser. The cooling water enters from the bottom of the condenser, and flows out at a temperature of 40-50 ℃ from the upper part of the condenser

转鼓结晶机:转鼓结晶机转鼓结晶机是将熔融状态的萘连续冷却成固态散装萘的机器 。转鼓结晶机由机壳保温池转鼓刮刀冷却水管和传动装置组成 。

Drum crystallizer: Drum crystallizer is a machine that continuously cools molten naphthalene into solid bulk naphthalene. The drum crystallization machine consists of a shell insulation pool, a drum scraper cooling water pipe, and a transmission device.

工业萘汽化冷凝冷却器：汽化冷凝冷却器由上下两部分组成 。

Industrial naphthalene vaporization condenser: The vaporization condenser consists of two parts: upper and lower.

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