Tar naphthalene

从煤焦油中分离出来的萘称之为焦油萘。在高温煤焦油中萘约占8-12%。从焦油精馏塔侧线切取出温度区间为210-230℃的萘油馏分，经过洗涤脱酚，再精馏分离轻组分，便可得到凝固点为78℃、纯度为96%的工业萘。

The naphthalene separated from coal tar is called tar naphthalene. In high-temperature coal tar, naphthalene accounts for approximately 8-12%. Cut naphthalene oil fraction with a temperature range of 210-230 ℃ from the side line of the tar distillation tower, wash and dephenolize it, and then distill and separate the light components to obtain industrial naphthalene with a solidification point of 78 ℃ and a purity of 96%.

工业萘中含杂质硫茚（1-3%）、甲基萘（1-2%）及少量茚、焦油碱和焦油酸，经过进步酸洗和蒸馏，可得到硫含量小于0.1%、凝固点为79℃的精萘。若需要进步精制使硫含量低于0.05%，则需采用加氢精制工艺。

Industrial naphthalene contains impurities such as sulfur indene (1-3%), methyl naphthalene (1-2%), and a small amount of indene, tar base, and tar acid. After progressive acid washing and distillation, refined naphthalene with a sulfur content of less than 0.1% and a solidification point of 79 ℃ can be obtained. If it is necessary to improve refining so that the sulfur content is below 0.05%, a hydrofining process is required.

石油萘

Petroleum naphthalene

石油萘的原料来自于催化重整、催化裂化和烃类裂解等过程的重芳烃组分。在催化重整油中，甲基萘的含量约为55%。先经过萃取和吸附，从原料馏分中分离出萘的各种同系物，然后采用催化临氢脱烷基的方法，以Cr2O3-Al2O3为催化剂，在400-800℃和0.5-7兆帕下进行临氢脱甲基反应，反应产物经冷却气相物质后，蒸馏除去轻组分苯、甲苯、二甲苯等，后进步精馏可得到石油萘产品。产品用溶剂吸收和溶剂洗涤的方法进行提纯，纯度可达99.73%。

The raw material of petroleum naphthalene comes from the heavy aromatic components of catalytic reforming, catalytic cracking, and hydrocarbon cracking processes. In catalytic reforming oil, the content of methyl naphthalene is about 55%. After extraction and adsorption, various homologues of naphthalene are separated from the raw material fraction. Then, a catalytic hydrodealkylation method is used, using Cr2O3-Al2O3 as catalyst, to undergo hydrodemethylation reaction at 400-800 ℃ and 0.5-7 MPa. The reaction product is cooled by gas phase substances, and the light components such as benzene, toluene, and xylene are removed by distillation. Then, petroleum naphthalene products can be obtained through further distillation. The product is purified using solvent absorption and solvent washing methods, with a purity of up to 99.73%.

据估计，以轻柴油为裂解原料的年产30万吨的乙烯装置，，可副产焦油9万吨，其中萘和萘潜量为4-5万吨。

It is estimated that an ethylene plant with an annual production of 300000 tons using light diesel as the cracking raw material can produce 90000 tons of tar as a byproduct, with a potential of 40-50000 tons of naphthalene and naphthalene.

用途

purpose

工业精萘是基础化工原料，主要用于生产减水剂、扩散剂，是生产合成树脂、增塑剂、橡胶防老剂，表面活性剂，合成纤维，染料、医药和香料等的原料。

Industrial refined naphthalene is a basic chemical raw material mainly used in the production of water reducing agents and dispersants. It is a raw material for the production of synthetic resins, plasticizers, rubber antioxidants, surfactants, synthetic fibers, dyes, pharmaceuticals, and spices.

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This article is a friendly contribution from a refined naphthalene manufacturer. For more information, please click on: http://www.jnjdbc.cn Sincere attitude. We will provide you with comprehensive services. We will gradually contribute more relevant knowledge to everyone. Stay tuned