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 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. Industrial naphthalene with a freezing point of 78 ℃ and a purity of 96% is obtained.

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，经过进一步酸洗和蒸馏，可得到硫含量小于0.1%、凝固点为79℃的精萘。若需要进一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 thioindene (1-3%), methylnaphthalene (1-2%), and a small amount of indene, tar base, and tar acid. After further pickling and distillation, refined naphthalene with a sulfur content of less than 0.1% and a freezing point of 79 ℃ can be obtained. If further refining is required to reduce the sulfur content below 0.05%, a hydrofining process is required.

用工业萘小批量生产精萘的流程如下，精萘厂家给您提出参考：

The process for small batch production of refined naphthalene from industrial naphthalene is as follows. The refined naphthalene manufacturer provides you with reference:

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。

Add sulfuric acid to molten naphthalene for dehydration, stir, and then stand still to separate the waste acid. Add another 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 let stand. Layer the polymer and sulfonated material. Neutralize the pH to 7-8 with a 10% sodium hydroxide solution, and remove the spent alkali after standing. After distillation and cooling, refined naphthalene products can be obtained.

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%。首先经过萃取和吸附，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，后进一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 feedstock for petroleum naphthalene comes from the heavy aromatic components of catalytic reforming, catalytic cracking, and hydrocarbon cracking processes. The content of methylnaphthalene in catalytic reforming oil is about 55%. First, various homologues of naphthalene are separated from the raw material fraction through extraction and adsorption. Then, a catalytic hydrodealkylation process is used, using Cr2O3-Al2O3 as a catalyst, to undergo a hydrodemethylation reaction at 400-800 ℃ and 0.5-7 MPa. After the reaction product is cooled by the gaseous phase material, the light components such as benzene, toluene, and xylene are removed by distillation. After that, petroleum naphthalene products can be obtained by further distillation. The product is purified by solvent absorption and solvent washing, with a purity of 99.73%.

用工业萘小批量生产精萘的流程相关内容就讲解到这里了，您对此有怎样的疑惑或者需求就来我们网站http://www.jnjdbc.cn咨询了解吧！

That's all about the process of producing refined naphthalene in small batches using industrial naphthalene. If you have any doubts or needs about this, please come to our website http://www.jnjdbc.cn Consult and understand!