工業(yè)萘 1.該名詞的定義、又稱(chēng) 萘是化學(xué)工業(yè)中一種很重要的原料，其主要由煤焦油進(jìn)一步加工分離制取，其在煤焦油中相對(duì)含量較高，在我國(guó)煤焦油中含量可達(dá)到8~12%，是焦油加工的重要產(chǎn)品。

Industrial naphthalene 1. The definition of the term, also known as naphthalene, is a very important raw material in the chemical industry. It is mainly produced by further processing and separation of coal tar. Its relative content in coal tar is relatively high, and its content in China's coal tar can reach 8 ~ 12%. It is an important product of tar processing.

2.該名詞的性狀、情況簡(jiǎn)介。

2. A brief introduction to the character and situation of the noun.

白色或微黃晶體，有強(qiáng)烈的氣味，溶于醚、甲醇，無(wú)水乙醇氯仿等，常溫下能升華，與空氣混合能形成爆炸性混合物，屬易燃固體，分子量128，密度ρ20 1.145g/cm3，沸點(diǎn)218℃，熔點(diǎn)80.2℃，閃點(diǎn)80℃，爆炸極限0.9-5.19%，自然點(diǎn)690℃，折射率1.58218。

White or yellowish crystal, with strong odor, soluble in ether, methanol, anhydrous ethanol, chloroform, etc. it can sublimate at room temperature and form explosive mixture when mixed with air. It is a flammable solid with molecular weight of 128 and density of 1 ρ 145g / cm3, boiling point 218 ℃, melting point 80.2 ℃, flash point 80 ℃, explosion limit 0.9-5.19%, natural point 690 ℃, refractive index 1.58218.

3.該產(chǎn)品的加工工藝情況 由煤焦油連續(xù)蒸餾切取的萘油經(jīng)換熱器溫度上升至190℃進(jìn)入初餾塔。

3. The processing technology of the product: naphthalene oil cut from continuous distillation of coal tar rises to 190 ℃ through the heat exchanger and enters the primary distillation tower.

塔頂蒸出的酚油經(jīng)換熱冷卻到130℃進(jìn)入回流曹，大部分回流到初餾塔頂。

The phenol oil evaporated from the top of the tower is cooled to 130 ℃ by heat exchange and enters the reflux system, most of which flows back to the top of the primary distillation tower.

塔底液分兩路，一路用泵送入萘塔，另一路用泵送入再沸器，與萘塔產(chǎn)生的蒸汽換熱，升至225℃時(shí)再回到初餾塔。

The liquid at the bottom of the tower is divided into two routes, one is pumped into the naphthalene tower, and the other is pumped into the reboiler to exchange heat with the steam generated by the naphthalene tower. When the temperature rises to 225 ℃, it returns to the primary distillation tower.

萘塔頂出來(lái)的蒸汽入初餾塔再沸器，凝縮后入萘塔回流槽，一部分作為回流到萘塔頂；另一部分作為含萘95%的產(chǎn)品抽出。

The steam from the top of naphthalene tower enters the reboiler of primary distillation tower, condenses and flows into the reflux tank of naphthalene tower, and a part of it flows back to the top of naphthalene tower; The other part was extracted as 95% naphthalene product.
               

4.用途 萘及萘系衍生物是有機(jī)化工重要原料之一，萘及萘系產(chǎn)品通?？捎擅航褂团c石油裂解焦油提取，有工業(yè)萘、精萘和甲基萘之分。

4. Uses naphthalene and its derivatives are one of the important raw materials for organic chemical industry. Naphthalene and its products can be extracted from coal tar and petroleum cracking tar, which can be divided into industrial naphthalene, refined naphthalene and methyl naphthalene.

煤焦油萘系產(chǎn)品硫含量高，而石油萘系產(chǎn)品硫含量低，更適于生產(chǎn)精萘、精甲基萘等。

Coal tar naphthalene products have high sulfur content, while petroleum naphthalene products have low sulfur content.

在石油化工行業(yè)的原油裂解生產(chǎn)乙烯的過(guò)程中，伴隨聯(lián)產(chǎn)大量的乙烯裂解焦油，以往尚無(wú)先進(jìn)的分離專(zhuān)有技術(shù)，裂解焦油除了部分作為生產(chǎn)碳黑之外，更多的則作為燃料油，致使寶貴的有機(jī)化工原料流失浪費(fèi)。

In the process of ethylene production from crude oil cracking in petrochemical industry, a large amount of ethylene cracking tar is produced. In the past, there is no advanced separation technology. Cracking tar is not only used to produce carbon black, but also used as fuel oil, resulting in the loss and waste of valuable organic chemical raw materials.

萘及萘系產(chǎn)品廣泛應(yīng)用于合成樹(shù)脂、涂料、醫(yī)藥、農(nóng)藥、輕工、塑料、助劑等行業(yè)，可用于制取苯酐、β-萘酚、甲萘胺、H酸、丁腈橡膠、增塑劑、擴(kuò)散劑、抗凝劑等產(chǎn)品，應(yīng)當(dāng)加以充分地利用，使其發(fā)揮更大的經(jīng)濟(jì)效益。

Naphthalene and its products are widely used in synthetic resin, coating, medicine, pesticide, light industry, plastics, additives and other industries β- Naphthol, methylnaphthylamine, H acid, NBR, plasticizer, dispersant, anticoagulant and other products should be fully utilized to bring greater economic benefits.

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