Naphthalene, also known as naphthalene, is a massive crystal with no color and gloss. Insoluble water, easy to sublimate, can evaporate with steam and has a special smell. It is a key polycyclic aromatic hydrocarbon in industrial production. It can be used to produce chemical intermediates for the manufacture of phthalic anhydride and dye, rubber additives and insecticides.

依据纯净度不样，萘可分成工业萘和精萘。工业萘的纯净度般约为96%。工业萘进步纯化脱除残渣及烟气脱硫后，可获得高纯的精萘。

According to different purity, naphthalene can be divided into industrial naphthalene and refined naphthalene. The purity of industrial naphthalene is generally about 96%. High purity refined naphthalene can be obtained after advanced purification of industrial naphthalene, removal of residue and flue gas desulfurization.

生产制造方式

Manufacturing mode

焦油萘

Naphthalene tar

从煤焦油中提取的萘称作焦油萘。在高温煤焦油中萘约占8-12%。从焦油精馏塔侧线切取下温度区段为210-230℃的萘油馏分，历经清洗脱酚，再精馏分离出来轻成分，便可获得凝固点为78℃、纯净度为96%的工业萘。

Naphthalene extracted from coal tar is called tar naphthalene. Naphthalene accounts for about 8-12% of high temperature coal tar. The naphthalene oil fraction with the temperature range of 210-230 ℃ is cut off from the side line of the tar distillation tower. After cleaning and dephenolization, the light components are separated by distillation, and the industrial naphthalene with the freezing point of 78 ℃ and purity of 96% can be obtained.

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。若需要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 residual indene (1-3%), methylnaphthalene (1-2%) and a small amount of indene, tar alkali and pyrooleic acid. After progressive pickling passivation and steam distillation, refined naphthalene with sulfur content less than 0.1% and freezing point of 79 ℃ can be obtained. If it is necessary to make the sulfur content less than 0.05%, the hydrofining process shall be selected.

用工业萘小大批量生产精萘的步骤以下：将盐酸添加熔化的萘中脱干，搅拌后静置分离出来废酸。再添加98%的盐酸，在85-95℃标准下搅拌40分钟，静置分离出来废酸。在搅拌下添加37%的甲醛溶液在85-95℃标准下搅拌50分钟，加温开水搅拌后静置，层次高聚物及磺化原材料。用10%氢氧化钠溶液中合PH到7-8，静置后去除废碱。终水蒸气蒸馏制冷可获得精萘商品。

The following steps are taken: after the refined naphthalene is added into the hydrochloric acid, the refined naphthalene is melted and separated in large quantities. Add 98% hydrochloric acid, stir at 85-95 ℃ for 40 minutes, and stand to separate the waste acid. Add 37% formaldehyde solution under stirring, stir for 50 minutes under the standard of 85-95 ℃, stir with heated boiled water, and then stand still to form high polymer and sulfonated raw materials. Add pH to 7-8 with 10% sodium hydroxide solution, and remove the waste alkali after standing. Refined naphthalene can be obtained by final steam distillation refrigeration.

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成分。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，水蒸气蒸馏去除轻成分苯、二甲苯、二甲苯等，终进步精馏可获得石油萘商品。商品用有

The raw material of petroleum naphthalene comes from heavy aromatics in the whole process of catalytic reforming, catalytic cracking and nitrogen compound cracking. In catalytic reforming oil, the water content of Methylnaphthalene is about 55%. After purification and adsorption, various homologues of naphthalene are separated from the raw material fraction. Then, the catalytic hydrodealkylation method is selected, and the hydrodemethylation reaction is carried out with Cr2O3-Al2O3 as the metal catalyst at 400-800 ℃ and 0.5-7 MPa. After the reflecting substances are cooled by liquid-phase chemicals, the light components such as benzene, xylene and xylene are removed by steam distillation, Petroleum naphthalene commodity can be obtained by final progressive distillation. Commodity use

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 output of 300000 tons with light diesel as cracking raw material can produce 90000 tons of tar, of which the potential of naphthalene and naphthalene is 40000-50000 tons.

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The above is the detailed introduction of refined naphthalene manufacturers. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service http://www.jnjdbc.cn