Tar naphthalene

从煤焦油中提取的萘称作焦油萘。在高溫煤焦油中萘约占8-12%。从焦油精馏塔侧线切取下溫度区段为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。

The naphthalene extracted from coal tar is called tar naphthalene. In high-temperature coal tar, naphthalene accounts for approximately 8-12%. Cut the naphthalene oil fraction with a temperature range of 210-230 ℃ from the side line of the tar distillation tower, undergo cleaning and dephenolization, and then separate the light components through distillation to obtain industrial naphthalene with a solidification point of 78 ℃ and a 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。若必须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 residues of thionines (1-3%), methyl naphthalene (1-2%), and small amounts of nines, tar alkali, and tar acid. After advanced acid washing, passivation, and steam distillation, refined naphthalene with a sulfur content below 0.1% and a solidification point of 79 ℃ can be obtained. If it is necessary to improve the special process to make the sulfur content less than 0.05%, then the hydrofining process needs to 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、二甲苯等，终进步精馏可获得石油萘商品。商品用有机溶剂消化吸收和有机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 aromatic components of the entire process of catalytic reforming, catalytic cracking, and nitrogen compound cracking. In catalytic reforming oil, the water content of methyl naphthalene is about 55%. After purification and adsorption, various homologues of naphthalene were separated from the raw material fraction. Subsequently, a catalytic reaction was used for hydrodealkylation, using Cr2O3-Al2O3 as a metal catalyst. The hydrodemethylation reaction was carried out at 400-800 ℃ and 0.5-7 MPa. The reaction substance was cooled by liquid phase chemical substances, and the light components such as benzene, xylene, and xylene were removed by steam distillation. Finally, petroleum naphthalene products were obtained through progressive distillation. The product is purified using organic solvent digestion and absorption, as well as organic solvent cleaning, with a purity of 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, butadiene equipment with an annual production capacity of 300000 tons using light diesel as cracking raw material can produce 90000 tons of tar as a byproduct, among which naphthalene and naphthalene have a potential of 40000 to 50000 tons.

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。

Industrial production of refined naphthalene is a basic raw material for chemical plants, suitable for the production and manufacturing of additives and external dispersants. It is a raw material for the production and manufacturing of resin materials, flame retardants, rubber antioxidants, surfactants, artificial fibers, dyes, pharmaceuticals, and spices.