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. A brief introduction to the character and situation of the noun.
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. 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.
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.
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.
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. 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.
Coal tar naphthalene products have high sulfur content, while petroleum naphthalene products have low sulfur content.
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.
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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