1.由石油烴制得：催化重質(zhì)重整油，催化裂化輕循環(huán)油，裂解制乙烯的副產(chǎn)焦油等；

1. Produced from petroleum hydrocarbons: catalytic heavy reforming oil, catalytic cracking light cycle oil, by-product tar from cracking to ethylene, etc;

2.由煤焦油分離，高溫煤焦油中萘約占8%-12%，將煤焦油蒸餾，切取煤油，經(jīng)脫酚，脫喹啉，蒸餾得成品萘。每噸萘消耗10t煤焦油；

2. By separating coal tar, naphthalene accounts for about 8% -12% in high-temperature coal tar. Distill the coal tar, cut the kerosene, remove phenols, remove quinolines, and distill to obtain finished naphthalene. Each ton of naphthalene consumes 10 tons of coal tar;

3.粗萘經(jīng)白土精制而得精萘；

3. Refined naphthalene is obtained by refining crude naphthalene with clay;

4.降膜分步結(jié)晶法 結(jié)晶法生產(chǎn)過程由產(chǎn)品生產(chǎn)工藝系統(tǒng)、能源系統(tǒng)、氮氣密封系統(tǒng)和計算機控制系統(tǒng)等組成。生產(chǎn)工藝系統(tǒng)以大循環(huán)為生產(chǎn)周期，每個大循環(huán)包含4個小循環(huán)，每個小循環(huán)又包含4～6個段，每個段由結(jié)晶、部分熔融和全部熔融3個步驟組成；

The production process of the falling film step-by-step crystallization method consists of a product production process system, an energy system, a nitrogen sealing system, and a computer control system. The production process system takes a large cycle as the production cycle, with each large cycle containing 4 small cycles and each small cycle containing 4-6 segments. Each segment consists of three steps: crystallization, partial melting, and complete melting;

（降膜結(jié)晶法操作工藝實例：由工業(yè)萘裝置送來的液態(tài)工業(yè)萘送入餾分槽中，當進行第四段結(jié)晶操作時，用泵將槽中的原料液送入動態(tài)結(jié)晶器收集槽中。未結(jié)晶萘油與發(fā)汗液放入純度低一級的餾分槽中，全熔液可作為第五段的原料。按預(yù)定程序進行六段結(jié)晶精制后即可得到產(chǎn)品精萘。為提高萘的提取率，可將富含硫茚的餾分送往靜態(tài)結(jié)晶器中處理，靜態(tài)結(jié)晶器所得的產(chǎn)品返回動態(tài)結(jié)晶系統(tǒng)的相應(yīng)餾分槽，殘液可作為減水劑出售。由于該裝置同時采用動態(tài)和靜態(tài)結(jié)晶器，既可保證較高的萘回收率，又能降低能耗。）

Example of falling film crystallization operation process: 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 pumped into the dynamic crystallizer collection tank. Uncrystallized naphthalene oil and sweating liquid are placed in the lower purity distillation tank, and the full melt can be used as the raw material for the fifth stage. After six stages of crystallization refining according to the predetermined procedure, the product refined naphthalene can be obtained. To improve the extraction rate of naphthalene The fraction rich in sulfur indene can be sent to a static crystallizer for processing, and the product obtained from the static crystallizer can be returned to the corresponding distillation tank of the dynamic crystallization system. The residual liquid can be sold as a water reducing agent. Due to the use of both dynamic and static crystallizers in this device, it can ensure a high naphthalene recovery rate while reducing energy consumption

5.靜態(tài)分步結(jié)晶法 將原料工業(yè)萘裝入結(jié)晶箱后進行快速降溫，降至82℃后轉(zhuǎn)為均勻降溫，以2℃/h的降溫速度冷卻至60℃，排放富含硫茚的第一次晶析萘油，作為中間餾分待后處理。然后結(jié)晶箱內(nèi)的物料以4℃/h的速度升溫，間隔0.5h取樣一次，測定其結(jié)晶點，根據(jù)結(jié)晶點的不同，分別排入對應(yīng)餾分槽，如此進行3～4次分步結(jié)晶，可得到較高純度的精萘。

5. Static stepwise crystallization method: The raw material industrial naphthalene is loaded into a crystallization box for rapid cooling, and after cooling to 82 ℃, it becomes uniformly cooled. It is cooled at a cooling rate of 2 ℃/h to 60 ℃, and the first crystallization naphthalene oil rich in sulfur indene is discharged as an intermediate fraction for post-treatment. Then, the material inside the crystallization box is heated at a rate of 4 ℃/h, and samples are taken every 0.5 hours to determine its crystallization point. According to the different crystallization points, they are discharged into the corresponding distillation tanks. This process is carried out 3-4 times in steps to obtain high-purity refined naphthalene.

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