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。较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 stand to separate waste acid. Add 98% sulfuric acid, stir at 85-95 ℃ for 40 minutes, and stand to separate the waste acid. Add 37% formaldehyde solution under stirring, stir at 85-95 ℃ for 50 minutes, stir with warm water and stand, and layer the polymer and sulfonated material. Neutralize pH to 7-8 with 10 sodium hydroxide solution, and remove waste alkali after standing. Refined naphthalene can be obtained by later distillation and cooling.

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。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，较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 raw materials of petroleum naphthalene come from heavy aromatic components in catalytic reforming, catalytic cracking and hydrocarbon cracking. The content of Methylnaphthalene in catalytic reforming oil is about 55. After extraction and adsorption, various homologues of naphthalene are separated from the raw material fraction, and then the hydrodemethylation reaction is carried out with Cr2O3-Al2O3 as catalyst at 400-800 ℃ and 0.5-7 MPa. After cooling the gas phase substances, the reaction products are distilled to remove the light components such as benzene, toluene and xylene, and then the petroleum naphthalene products 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 the ethylene plant with an annual output of 300000 tons using light diesel as cracking raw material can produce 90000 tons of tar, including 40000-50000 tons of naphthalene and naphthalene potential.

沸点217.9℃；不溶于水，溶于无水乙醇

Boiling point 217.9 ℃; Insoluble in water, soluble in absolute ethanol

制取1-萘酚、2-萘酚等染料中间体, 生产增塑剂、合成树脂、合成表面活性剂等。

Prepare 1-naphthol, 2-naphthol and other dye intermediates, and produce plasticizers, synthetic resins, synthetic surfactants, etc.

萘，又称并萘，是一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。是工业上较重要的稠环芳烃，可用于生产苯酐、染料的中间体、橡胶助剂和杀虫剂。

Naphthalene, also known as naphthalene, is a colorless and shiny flake crystal. 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. It can be used in the production of phthalic anhydride, dye intermediates, rubber additives and pesticides.

根据纯度不同，萘可分为工业萘和精萘。

According to different purity, naphthalene can be divided into industrial naphthalene and refined naphthalene.

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The wonderful contents of this article are provided by refined naphthalene manufacturers. There are many wonderful contents on this website. You can click to enter more contents: http://www.jnjdbc.cn We have special customer service to answer your questions