萘，又称并萘，是种无色有光泽的片状结晶。不溶于水，易升华，能随水蒸气挥发，有特殊气味。是工业上重要的稠环芳烃，可用于生产苯酐、染料的中间体、橡胶助剂和杀虫剂。根据纯度不同，萘可分为工业萘和精萘。那么焦油萘与石油萘怎么产生的呢？下面精萘厂家为你分析：

Naphthalene, also known as naphthalene, is a colorless and shiny flake crystal. It is insoluble in water, easy to sublimate, can volatilize with water vapor, and has a special smell. It is an important polycyclic aromatic hydrocarbon in industry and can be used to produce phthalic anhydride, intermediate of dyes, rubber auxiliaries and pesticides. According to the purity, naphthalene can be divided into industrial naphthalene and refined naphthalene. How did tar naphthalene and petroleum naphthalene come into being? The following refined naphthalene manufacturer will analyze for you:

焦油萘

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。

Naphthalene separated from coal tar is called tar naphthalene. In high-temperature coal tar, naphthalene accounts for about 8-12%. Naphthalene oil fraction with a temperature range of 210-230 ℃ is cut from the side line of the tar distillation tower, washed and dephenolized, and then distilled to separate the light components to obtain industrial naphthalene with a freezing 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 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 sulfur content less than 0.1% and freezing point of 79 ℃ can be obtained. If it is necessary to improve refining to make the sulfur content lower than 0.05%, the hydrofining process shall be adopted.

用工业萘小批量生产精萘的流程如下：将硫酸加入熔融的萘中脱水，搅拌后静置分离废酸。再加入98%的硫酸，在85-95℃条件下搅拌40分钟，静置分离废酸。在搅拌下加入37%的甲醛溶液在85-95℃条件下搅拌50分钟，加温水搅拌后静置，分层聚合物及磺化物料。用10%氢氧化钠溶液中和PH到7-8，静置后除去废碱。后蒸馏冷却可得到精萘产品。

The process of small batch production of refined naphthalene from industrial naphthalene is as follows: add sulfuric acid into molten naphthalene for dehydration, stir and then stand still to separate the waste acid. Then add 98% sulfuric acid, stir at 85-95 ℃ for 40 minutes, and stand still to separate the waste acid. Add 37% formaldehyde solution under stirring and stir for 50 minutes at 85-95 ℃. Stir with warm water and then stand still. Layer the polymer and sulfonated material. Neutralize PH to 7-8 with 10% sodium hydroxide solution, and remove waste alkali after standing. After distillation and cooling, refined naphthalene products can be obtained.

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 aromatics components in catalytic reforming, catalytic cracking and hydrocarbon cracking. In the 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, and then the method of catalytic hydrodealkylation is adopted. With Cr2O3-Al2O3 as catalyst, the hydrodemethylation reaction is carried out at 400-800 ℃ and 0.5-7 MPa. After the reaction product is cooled by gas phase substances, the light components of benzene, toluene, xylene, etc. are removed by distillation, and then the petroleum naphthalene product can be obtained by further distillation. The product is purified by solvent absorption and solvent washing, and the purity can reach 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 output of 300000 tons using light diesel oil as cracking feedstock can produce 90000 tons of tar by side, of which naphthalene and naphthalene have a potential of 40000 to 50000 tons.

精萘可用染料，医药等域，如生产2-萘酚、1-萘酚和甲萘胺等，也是生产樟脑的主要原料。您的使用有需求就来我们网站咨询，或者直接拨打我们电话http://www.jnjdbc.cn了解！

Refined naphthalene can be used in dye, medicine and other fields, such as production of 2-naphthol, 1-naphthol and methylnaphthylamine, and is also the main raw material for production of camphor. If you need to use it, please come to our website or call us directly http://www.jnjdbc.cn Understand!