精萘(91-20-3)主要可用于皮革防霉，防腐。萘是工業(yè)上重要的稠環(huán)烴，主要用于生產(chǎn)苯酐各種萘酚萘胺等，是生產(chǎn)合成樹(shù)脂增塑劑染料的中間體表面活性劑合成纖維涂料農(nóng)藥醫(yī)藥香料橡膠助劑和殺蟲(chóng)劑的原料。

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，各國(guó)有所不同。用于生產(chǎn)苯酐的大致占70%，用于染料中間體和橡膠助劑的約占15%，殺蟲(chóng)劑的約占6%，鞣革劑的約占4%。用于生產(chǎn)殺蟲(chóng)劑的比例較大，主要是用于生產(chǎn)西維因。以萘為原料，經(jīng)過(guò)磺化硝化還原胺化水解等單元操作，可制得多種中間體。精萘的應(yīng)用還在拓寬，新產(chǎn)品“超級(jí)塑性材料”即萘磺酸鹽甲醛縮合物，可用作水泥添加劑，增加混凝土的塑性變形而不降低其強(qiáng)度。今后幾年需求量將以5-10%的速度增長(zhǎng)。

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.

工業(yè)萘的主要成份為有機(jī)化合物,是一種無(wú)色有光澤的片狀結(jié)晶,根據(jù)純度不同,萘可分為工業(yè)萘和精萘,工業(yè)萘的純度一般約為96%,工業(yè)萘進(jìn)一步提純脫除雜質(zhì)及脫硫后,可得到高純度的精萘.

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

生產(chǎn)工業(yè)萘的主要設(shè)備

Main equipment for producing industrial naphthalene

精餾塔：工業(yè)萘精餾塔一般采用浮閥塔,浮閥板層50-70層,塔徑按處理量的大小有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

冷凝冷卻器：冷凝冷卻器是一個(gè)直徑為1.2m,長(zhǎng)為3.376m,冷卻面積為122m2的列管式換熱器,生產(chǎn)時(shí)冷卻水走管內(nèi),萘蒸汽以138-140℃的溫度從器頂進(jìn)入管間換熱后再以80-90℃的溫度從器底呈液體流出,冷卻水從器底進(jìn)入,器上部以40-50℃溫度流出

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

轉(zhuǎn)鼓結(jié)晶機(jī):轉(zhuǎn)鼓結(jié)晶機(jī)轉(zhuǎn)鼓結(jié)晶機(jī)是將熔融狀態(tài)的萘連續(xù)冷卻成固態(tài)散裝萘的機(jī)器 。轉(zhuǎn)鼓結(jié)晶機(jī)由機(jī)殼保溫池轉(zhuǎn)鼓刮刀冷卻水管和傳動(dòng)裝置組成 。

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.

工業(yè)萘汽化冷凝冷卻器：汽化冷凝冷卻器由上下兩部分組成 。

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

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