According to different purity, naphthalene can be divided into industrial refined naphthalene and refined naphthalene. What are the manufacturing methods and main uses of industrial refined naphthalene?

焦油萘

Tar naphthalene

从煤焦油中提取的萘称作焦油萘。在高温煤焦油中萘约占8-12。从焦油精馏塔侧线切取下温度区段为210-230℃的萘油馏分，历经清洗脱酚，再精馏分离出来轻组分，便可获得凝固点为78℃、纯度为96的工业萘。

Naphthalene extracted from coal tar is called tar naphthalene. Naphthalene accounts for about 8-12% of high temperature coal tar. The naphthalene oil fraction with the temperature range of 210-230 ℃ is cut from the side line of the tar distillation tower, cleaned and dephenolized, and then the light components are separated by distillation to obtain the industrial naphthalene with the freezing point of 78 ℃ and purity of 96.

工业萘中含残渣硫茚（1-3）、甲基萘（1-2）及小量茚、焦油碱和焦油酸，历经进步酸洗钝化和水蒸气蒸馏，可获得硫含量低于0.1、凝固点为79℃的精萘。若进步特制使硫含量小于0.05，则需选用加氢精制加工工艺。

Industrial naphthalene contains residue indene (1-3), methylnaphthalene (1-2), a small amount of indene, tar alkali and pyrooleic acid. After progressive acid pickling, passivation and steam distillation, refined naphthalene with sulfur content less than 0.1 and freezing point of 79 ℃ can be obtained. If the sulfur content is less than 0.05, the hydrofining process shall be selected.

石油萘

Petroleum naphthalene

石油萘的原料来源于于催化重整、催化裂化和氮化合物裂化等全过程的重芳烃组分。在催化重整油中，甲基萘的含水量约为55。先历经提纯和吸咐，从原料馏分中分离出来出萘的各种各样同系物，随后选用催化反应临氢脱烷基的方式，以Cr2O3-Al2O3为金属催化剂，在400-800℃和0.5-7兆帕下开展临氢脱甲基反映，反映物质经制冷液相化学物质后，水蒸气蒸馏去除轻组分苯、二甲苯、二甲等，终进步精馏可获得石油萘商品。商品用溶剂消化吸收和溶剂清洗的方式开展纯化，纯度达到99.73。

The raw material of petroleum naphthalene comes from the heavy aromatics in the whole process of catalytic reforming, catalytic cracking and nitrogen compound cracking. In catalytic reforming oil, the water content of Methylnaphthalene is about 55. After purification and adsorption, various homologues of naphthalene are separated from the raw material fraction. Then, the catalytic hydrodealkylation method is selected, and the hydrodemethylation reaction is carried out with Cr2O3-Al2O3 as the metal catalyst at 400-800 ℃ and 0.5-7 MPa. After the reflecting substances are cooled by liquid-phase chemicals, the light components such as benzene, xylene and dimethyl are removed by steam distillation, Petroleum naphthalene commodity can be obtained by final distillation. The product was purified by solvent digestion and absorption and solvent cleaning, and the purity reached 99.73.

据统计，以轻柴油为裂化原料的年产量30万吨级的丁二烯设备，，可副产焦油9万吨级，在其中萘和萘潜量为4-5万吨级。

According to statistics, the butadiene equipment with an annual output of 300000 tons with light diesel as cracking raw material can produce 90000 tons of tar, including 40000-50000 tons of naphthalene and naphthalene potential.

主要用途

Main purpose

工业生产精萘是基本化工厂原料，适用于生产制造外加剂、外扩散剂，是生产制造树脂材料、阻燃剂、橡胶防老剂，表活剂，人造纤维，染剂、药业和香辛料等的原料。

Refined naphthalene for industrial production is the raw material of basic chemical plants. It is suitable for the production and manufacture of additives and dispersants. It is the raw material for the production and manufacture of resin materials, flame retardants, rubber antioxidants, surfactants, man-made fibers, dyes, pharmaceuticals and spices.

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