萘是稠環(huán)芳烴，是有機(jī)化合物。分子式為C10H8，無(wú)色，有毒，易升華，片狀晶體，有特殊氣味。它是由焦化煤焦油和石油蒸餾大量生產(chǎn)的，主要用于鄰苯二甲酸酐的合成。

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.

從石油烴類(lèi)制造：催化重整油，輕循環(huán)油催化裂化，乙烯裂解副產(chǎn)物焦油等；

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

與煤焦油分離，高溫煤焦油中的萘約占8％-12％。將煤焦油蒸餾，將煤油切碎，并通過(guò)脫酚和脫喹啉蒸餾獲得終的萘。

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.

精萘廠(chǎng)家提醒，精萘是將粗萘精制而成。

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

降膜分步結(jié)晶結(jié)晶生產(chǎn)工藝流程由產(chǎn)品生產(chǎn)工藝系統(tǒng)，能量系統(tǒng)，氮?dú)饷芊庀到y(tǒng)和計(jì)算機(jī)控制系統(tǒng)組成。生產(chǎn)過(guò)程系統(tǒng)將大周期用作生產(chǎn)周期。每個(gè)大周期包含4個(gè)小周期，每個(gè)小周期包含4至6個(gè)段。每個(gè)段包括3個(gè)步驟：結(jié)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;

（從工業(yè)萘裝置送來(lái)的液態(tài)工業(yè)萘被送到餾出罐，當(dāng)進(jìn)行第四階段結(jié)晶操作時(shí)，罐中的原料液體被送到動(dòng)態(tài)結(jié)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

未結(jié)晶的萘油和汗液放入純度較低的分餾罐中，并且在第五階段中可以將全部熔體用作原料?？梢愿鶕?jù)預(yù)定程序在六個(gè)階段的晶體精制之后獲得精致的萘。為了提高萘的萃取率，可以將富含硫茚的餾分送入靜態(tài)結(jié)晶器進(jìn)行處理。從靜態(tài)結(jié)晶器中獲得的產(chǎn)品返回到動(dòng)態(tài)結(jié)晶系統(tǒng)的相應(yīng)分餾罐中，殘留液體可以作為減水劑出售。由于該設(shè)備同時(shí)使用動(dòng)態(tài)和靜態(tài)結(jié)晶器，因此不僅可以確保更高的萘回收率，而且可以減少能耗。 ）

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

靜態(tài)逐步結(jié)晶將原料工業(yè)萘裝入結(jié)晶箱中，然后快速冷卻至82°C。之后，將其以2°C/h的冷卻速率均勻冷卻至60°C，即排放量豐富。硫代茚的萘油的第一次結(jié)晶用作中間餾分進(jìn)行后處理。然后將結(jié)晶箱中的物料以4°C/h的速率加熱，并以0.5h的間隔取樣，并測(cè)量結(jié)晶點(diǎn)。根據(jù)不同的結(jié)晶點(diǎn)，它們被排入相應(yīng)的分餾罐。這樣，可以進(jìn)行3至4次結(jié)晶。獲得了更高純度的精制萘。

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.

衍生產(chǎn)物：

Derived products:

可與煤焦油（焦油萘）的中間有部分和石炭酸部分分離；它也可以與十個(gè)裂解焦油（石油萘）中分離；脫甲基。

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.

萘的生產(chǎn)制備介紹就到這里了，希望能夠給您好的幫助，更多事項(xiàng)就來(lái)我們網(wǎng)站http://gaozhifeng.com咨詢(xún)！

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://gaozhifeng.com consulting service