萘是稠环芳烃，是有机化合物。分子式为C10H8，无色，有毒，易升华，片状晶体，有特殊气味。它是由焦化煤焦油和石油蒸馏大量生产的，主要用于邻苯二甲酸酐的合成。

Naphthalene is a polycyclic aromatic hydrocarbon and an organic compound. The molecular formula is C10H8, colorless, toxic, easily sublimated, flake like crystal, with a special odor. It is produced in large quantities by coking coal tar and petroleum distillation, and is mainly used for the synthesis of phthalic anhydride.

从石油烃类制造：催化重整油，轻循环油催化裂化，乙烯裂解副产物焦油等；

Manufacturing from petroleum hydrocarbons: catalytic reforming oil, light circulating oil catalytic cracking, ethylene cracking by-product tar, etc;

与煤焦油分离，高温煤焦油中的萘约占8％-12％。将煤焦油蒸馏，将煤油切碎，并通过脱酚和脱喹啉蒸馏获得终的萘。

When separated from coal tar, naphthalene in high-temperature coal tar accounts for 8% - 12%. The coal tar is distilled, the kerosene is chopped, and the final naphthalene is obtained by dephenolization and dequinoline distillation.

精萘厂家提醒，精萘是将粗萘精制而成。

Refined naphthalene manufacturers remind that refined naphthalene is refined from crude naphthalene.

降膜分步结晶结晶生产工艺流程由产品生产工艺系统，能量系统，氮气密封系统和计算机控制系统组成。生产过程系统将大周期用作生产周期。每个大周期包含4个小周期，每个小周期包含4至6个段。每个段包括3个步骤：结晶，部分熔融和全部熔融；

The production process of falling film fractional crystallization consists of product production process system, energy system, nitrogen sealing system and computer control system. The production process system uses large cycles as production cycles. Each large cycle contains 4 small cycles, and each small cycle contains 4 to 6 segments. Each segment includes three steps: crystallization, partial melting, and complete melting;

（从工业萘装置送来的液态工业萘被送到馏出罐，当进行第四阶段结晶操作时，罐中的原料液体被送到动态结晶器收集槽

The liquid industrial naphthalene sent from the industrial naphthalene unit is sent to the distillation tank. When the fourth stage crystallization operation is carried out, the raw material liquid in the tank is sent to the dynamic crystallizer collection tank

未结晶的萘油和汗液放入纯度较低的分馏罐中，并且在第五阶段中可以将全部熔体用作原料。可以根据预定程序在六个阶段的晶体精制之后获得精致的萘。为了提高萘的萃取率，可以将富含硫茚的馏分送入静态结晶器进行处理。从静态结晶器中获得的产品返回到动态结晶系统的相应分馏罐中，残留液体可以作为减水剂出售。由于该设备同时使用动态和静态结晶器，因此不仅可以确保更高的萘回收率，而且可以减少能耗。 ）

Uncrystallized naphthalene oil and sweat are placed in a lower purity fractionation tank, and in the fifth stage, all melts can be used as raw materials. Refined naphthalene can be obtained after six stages of crystal refinement according to predetermined procedures. In order to improve the extraction rate of naphthalene, the fraction rich in thionines can be sent to a static crystallizer for processing. The product obtained from the static crystallizer is returned to the corresponding fractionation tank of the dynamic crystallization system, and the residual liquid can be sold as a water reducing agent. Due to the use of both dynamic and static crystallizers, this equipment not only ensures higher naphthalene recovery rates but also reduces energy consumption

静态逐步结晶将原料工业萘装入结晶箱中，然后快速冷却至82°C。之后，将其以2°C/h的冷却速率均匀冷却至60°C，即排放量丰富。硫代茚的萘油的第一次结晶用作中间馏分进行后处理。然后将结晶箱中的物料以4°C/h的速率加热，并以0.5h的间隔取样，并测量结晶点。根据不同的结晶点，它们被排入相应的分馏罐。这样，可以进行3至4次结晶。获得了更高纯度的精制萘。

The raw material industrial naphthalene is gradually crystallized in a static state and then quickly cooled to 82 ° C. Afterwards, it is evenly cooled at a cooling rate of 2 ° C/h to 60 ° C, indicating abundant emissions. The first crystallization of naphthalene oil containing thionines is used as an intermediate fraction for post-processing. Then heat the material in the crystallization box at a rate of 4 ° C/h, sample at intervals of 0.5 h, and measure the crystallization point. According to different crystallization points, they are discharged into the corresponding fractionation tanks. This allows for 3 to 4 crystallization cycles. Obtained higher purity refined naphthalene.

衍生产物：

Derived products:

可与煤焦油（焦油萘）的中间有部分和石炭酸部分分离；它也可以与十个裂解焦油（石油萘）中分离；脱甲基。

It can be separated from the middle part of coal tar (tar naphthalene) and the carbonic acid part; It can also be separated from ten cracked tar (petroleum naphthalene); Demethylation.

其衍生物主要是萘酚和萘乙酸。

Its derivatives are mainly naphthol and naphthylacetic acid.

萘的生产制备介绍就到这里了，希望能够给您好的帮助，更多事项就来我们网站http://www.jnjdbc.cn咨询！

That's all for the introduction to the production and preparation of naphthalene. I hope you can be helpful. For more information, please come to our website http://www.jnjdbc.cn consulting service