目前精萘的工業(yè)生產(chǎn)法，一般采用箱式分步結(jié)晶、似精餾原理的區(qū)域熔融結(jié)晶方法，工藝包括工業(yè)萘的溶解、冷卻、發(fā)汗、結(jié)晶等重復(fù)性的五級(jí)或七級(jí)分步結(jié)晶。在“萘”的結(jié)晶過程中，由于雜質(zhì)硫茚與萘?xí)纬晒踩垠w，也會(huì)在結(jié)晶中析出，降低純化能力。為達(dá)到所需的純度，需多次重復(fù)這樣的結(jié)晶操作。但受分離推動(dòng)力的限制，獲得的產(chǎn)品精萘仍含有硫茚0.2～0.5%，甚至0.9%，它是影響“萘”制四氫化萘、十氫化萘 (萘滿) 催化劑壽命以及碳纖維質(zhì)量的關(guān)鍵因素之一。

At present, the industrial production method of refined naphthalene generally adopts a box type stepwise crystallization and a zone melting crystallization method similar to distillation principle. The process includes repeated five or seven stage stepwise crystallization of industrial naphthalene, including dissolution, cooling, sweating, crystallization, etc. During the crystallization process of naphthalene, impurities such as sulfur indene and naphthalene will form a co melt, which will also precipitate during crystallization, reducing purification ability. To achieve the desired purity, this crystallization operation needs to be repeated multiple times. However, due to the limitation of separation driving force, the obtained refined naphthalene still contains 0.2-0.5% or even 0.9% of thionines, which is one of the key factors affecting the lifespan of catalysts for the production of tetrahydronaphthalene and decahydronaphthalene (naphthalene) from naphthalene, as well as the quality of carbon fibers.

試制的超精萘用于四氫化萘、十氫化萘 (萘滿) 加氫試驗(yàn)催化劑壽命提高20-100倍；在碳纖維試制方面改變以煤瀝青中間相原料為超精萘，在反應(yīng)控制、材料質(zhì)量方面將上等級(jí)，應(yīng)用前景廣。

The trial production of ultra fine naphthalene for hydrogenation of tetrahydrogenated naphthalene and decahydrogenated naphthalene (naphthalene) has increased the catalyst life by 20-100 times; In the trial production of carbon fibers, changing the use of coal tar pitch as the intermediate phase raw material for ultra fine naphthalene will improve reaction control and material quality, and have broad application prospects.

白色易揮發(fā)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(diǎn):80℃;熔點(diǎn) 80.1℃ 沸點(diǎn)217.9℃;不溶于水，溶于無水乙醇、醚、苯,相對(duì)密度(水=1)1.16;相對(duì)密度(空氣=1)4.42;穩(wěn)定性:穩(wěn)定;危險(xiǎn)標(biāo)記:8(易燃固體);主要用途:用于制造染料中間體、樟腦丸、皮革、木材保護(hù)劑。

White volatile crystals with a mild aromatic odor, crude naphthalene with a coal tar odor; Vapour 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; Danger mark: 8 (flammable solid); Main uses: Used for manufacturing dye intermediates, camphor balls, leather, and wood protectants.

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