工业萘 1.该名词的定义、又称 萘是化学工业中一种很重要的原料，其主要由煤焦油进一步加工分离制取，其在煤焦油中相对含量较高，在我国煤焦油中含量可达到8~12%，是焦油加工的重要产品。

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.该名词的性状、情况简介。

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

白色或微黄晶体，有强烈的气味，溶于醚、甲醇，无水乙醇氯仿等，常温下能升华，与空气混合能形成爆炸性混合物，属易燃固体，分子量128，密度ρ20 1.145g/cm3，沸点218℃，熔点80.2℃，闪点80℃，爆炸极限0.9-5.19%，自然点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.该产品的加工工艺情况 由煤焦油连续蒸馏切取的萘油经换热器温度上升至190℃进入初馏塔。

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.

塔顶蒸出的酚油经换热冷却到130℃进入回流曹，大部分回流到初馏塔顶。

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.

塔底液分两路，一路用泵送入萘塔，另一路用泵送入再沸器，与萘塔产生的蒸汽换热，升至225℃时再回到初馏塔。

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.

萘塔顶出来的蒸汽入初馏塔再沸器，凝缩后入萘塔回流槽，一部分作为回流到萘塔顶；另一部分作为含萘95%的产品抽出。

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机化工重要原料之一，萘及萘系产品通常可由煤焦油与石油裂解焦油提取，有工业萘、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.

煤焦油萘系产品硫含量高，而石油萘系产品硫含量低，更适于生产精萘、精甲基萘等。

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

在石油化工行业的原油裂解生产乙烯的过程中，伴随联产大量的乙烯裂解焦油，以往尚无先进的分离专有技术，裂解焦油除了部分作为生产碳黑之外，更多的则作为燃料油，致使宝贵的有机化工原料流失浪费。

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.

萘及萘系产品广泛应用于合成树脂、涂料、医药、农药、轻工、塑料、助剂等行业，可用于制取苯酐、β-萘酚、甲萘胺、H酸、丁腈橡胶、增塑剂、扩散剂、抗凝剂等产品，应当加以充分地利用，使其发挥更大的经济效益。

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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Thank you for reading, hope the above content is helpful to you, if you want to know more wonderful content, please click our official website: refined naphthalene manufacturers http://www.jnjdbc.cn .