萘，又稱并萘，是種無色有光澤的片狀結(jié)晶。不溶于水，易升華，能隨水蒸氣揮發(fā)，有特殊氣味。是工業(yè)上重要的稠環(huán)芳烴，可用于生產(chǎn)苯酐、染料的中間體、橡膠助劑和殺蟲劑。根據(jù)純度不同，萘可分為工業(yè)萘和精萘。那么焦油萘與石油萘怎么產(chǎn)生的呢？下面精萘廠家為你分析：

Naphthalene, also known as naphthalene, is a colorless and shiny crystalline flake. Insoluble in water, prone to sublimation, can evaporate with water vapor, and has a special odor. It is an important polycyclic aromatic hydrocarbon in industry and can be used as an intermediate in the production of phthalic anhydride, dyes, rubber additives, and insecticides. According to different purities, naphthalene can be divided into industrial naphthalene and refined naphthalene. So how are tar naphthalene and petroleum naphthalene produced? The following refined naphthalene manufacturer will analyze for you:

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(cè)線切取出溫度區(qū)間為210-230℃的萘油餾分，經(jīng)過洗滌脫酚，再精餾分離輕組分，便可得到凝固點(diǎn)為78℃、純度為96%的工業(yè)萘。

The naphthalene separated from coal tar is called tar naphthalene. Naphthalene accounts for 8-12% of high temperature coal tar. Cut naphthalene oil fraction with a temperature range of 210-230 ℃ from the side line of the tar distillation tower, wash and dephenolize it, and then distill and separate the light components to obtain industrial naphthalene with a solidification point of 78 ℃ and a purity of 96%.

工業(yè)萘中含雜質(zhì)硫茚（1-3%）、甲基萘（1-2%）及少量茚、焦油堿和焦油酸，經(jīng)過進(jìn)步酸洗和蒸餾，可得到硫含量小于0.1%、凝固點(diǎn)為79℃的精萘。若需要進(jìn)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 sulfur 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 a sulfur content of less than 0.1% and a solidification point of 79 ℃ can be obtained. If it is necessary to improve refining so that the sulfur content is below 0.05%, a hydrofining process is required.

用工業(yè)萘小批量生產(chǎn)精萘的流程如下：將硫酸加入熔融的萘中脫水，攪拌后靜置分離廢酸。再加入98%的硫酸，在85-95℃條件下攪拌40分鐘，靜置分離廢酸。在攪拌下加入37%的甲醛溶液在85-95℃條件下攪拌50分鐘，加溫水?dāng)嚢韬箪o置，分層聚合物及磺化物料。用10%氫氧化鈉溶液中和PH到7-8，靜置后除去廢堿。后蒸餾冷卻可得到精萘產(chǎn)品。

The process of producing refined naphthalene in small batches using industrial naphthalene is as follows: adding sulfuric acid to molten naphthalene for dehydration, stirring, and then standing to separate the waste acid. Add 98% sulfuric acid again, stir at 85-95 ℃ for 40 minutes, and let stand to separate the waste acid. Add 37% formaldehyde solution under stirring and stir at 85-95 ℃ for 50 minutes. 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 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%。先經(jīng)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(jìn)行臨氫脫甲基反應(yīng)，反應(yīng)產(chǎn)物經(jīng)冷卻氣相物質(zhì)后，蒸餾除去輕組分苯、甲苯、二甲苯等，后進(jìn)步精餾可得到石油萘產(chǎn)品。產(chǎn)品用溶劑吸收和溶劑洗滌的方法進(jìn)行提純，純度可達(dá)99.73%。

The feedstock of petroleum naphthalene comes from heavy aromatics in catalytic reforming, catalytic cracking and hydrocarbon cracking processes. 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. Then, a catalytic hydrodealkylation method is used, using Cr2O3-Al2O3 as catalyst, to undergo hydrodemethylation reaction at 400-800 ℃ and 0.5-7 MPa. The reaction product is cooled by gas phase substances, and the light components such as benzene, toluene, and xylene are removed by distillation. Then, petroleum naphthalene products can be obtained through further distillation. The product is purified using solvent absorption and solvent washing methods, with a purity of up to 99.73%.

據(jù)估計(jì)，以輕柴油為裂解原料的年產(chǎn)30萬噸的乙烯裝置，，可副產(chǎn)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 production of 300000 tons using light diesel as the cracking raw material can produce 90000 tons of tar as a byproduct, with a potential of 40-50000 tons of naphthalene and naphthalene.

精萘可用染料，醫(yī)藥等域，如生產(chǎn)2-萘酚、1-萘酚和甲萘胺等，也是生產(chǎn)樟腦的主要原料。您的使用有需求就來我們網(wǎng)站咨詢，或者直接撥打我們電話http://m.2cgg.com了解！

Refined naphthalene can be used in dyes, pharmaceuticals, and other fields, such as the production of 2-naphthol, 1-naphthol, and methylnaphthylamine, and is also the main raw material for the production of camphor. If you have any usage needs, please come to our website for consultation or call us directly http://m.2cgg.com Understand!