According to the different purity, naphthalene can be divided into industrial refined naphthalene and refined naphthalene. So what are the production methods and uses of industrial refined naphthalene?

　　焦油萘

　　Tar naphthalene

　　從煤焦油中分離出來的萘稱之為焦油萘。在高溫煤焦油中萘約占8-12%。從焦油精餾塔側線切取出溫度區(qū)間為210-230℃的萘油餾分，經過洗滌脫酚，再精餾分離輕組分，便可得到凝固點為78℃、純度為96%的工業(yè)萘。

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

　　工業(yè)萘中含雜質硫茚（1-3%）、甲基萘（1-2%）及少量茚、焦油堿和焦油酸，經過進一步酸洗和蒸餾，可得到硫含量小于0.1%、凝固點為79℃的精萘。若需要進一步精制使硫含量低于0.05%，則需采用加氫精制工藝。

　　Industrial naphthalene contains impurities such as thioindene (1-3%), methyl naphthalene (1-2%) and a small amount of indene, tar base and pyrooleic acid. After further pickling and distillation, refined naphthalene with sulfur content less than 0.1% and freezing point of 79 ℃ can be obtained. If the sulfur content is lower than 0.05%, the hydrofining process should be adopted.

　　石油萘

　　Petroleum naphthalene

　　石油萘的原料來自于催化重整、催化裂化和烴類裂解等過程的重芳烴組分。在催化重整油中，甲基萘的含量約為55%。首先經過萃取和吸附，從原料餾分中分離出萘的各種同系物，然后采用催化臨氫脫烷基的方法，以Cr2O3-Al2O3為催化劑，在400-800℃和0.5-7兆帕下進行臨氫脫甲基反應，反應產物經冷卻氣相物質后，蒸餾除去輕組分苯、甲苯、二甲苯等，然后進一步精餾可得到石油萘產品。產品用溶劑吸收和溶劑洗滌的方法進行提純，純度可達99.73%。
               

　　The feedstock of petroleum naphthalene comes from heavy aromatics in catalytic reforming, catalytic cracking and hydrocarbon cracking. In the catalytic reforming oil, the content of Methylnaphthalene is about 55%. Firstly, various homologues of naphthalene were separated from the raw material fraction by extraction and adsorption. Then, the hydrodemethylation reaction was carried out with Cr2O3-Al2O3 as catalyst at 400-800 ℃ and 0.5-7 MPa. After cooling the gas phase, the light components such as benzene, toluene and xylene were removed by distillation. Finally, petroleum naphthalene was obtained by further distillation Products. The purity of the product can reach 99.73% by solvent absorption and solvent washing.

　　據估計，以輕柴油為裂解原料的年產30萬噸的乙烯裝置，可副產焦油9萬噸，其中萘和萘潛量為4-5萬噸。

　　It is estimated that an ethylene plant with an annual output of 300000 tons using light diesel oil as cracking raw material can produce 90000 tons of tar by-product, of which naphthalene and naphthalene have a potential of 40000-50000 tons.

　　用途

　　purpose

　　工業(yè)精萘是基礎化工原料，主要用于生產減水劑、擴散劑，是生產合成樹脂、增塑劑、橡膠防老劑，表面活性劑，合成纖維，染料、醫(yī)藥和香料等的原料。

　　Industrial refined naphthalene is a basic chemical raw material, which is mainly used to produce water reducing agent and dispersant. It is also a raw material for producing synthetic resin, plasticizer, rubber antioxidant, surfactant, synthetic fiber, dye, medicine and perfume.

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