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，便可得到凝固點為78℃、純度為96%的工業(yè)萘。

The naphthalene separated from coal tar is called tar naphthalene. In high-temperature coal tar, naphthalene accounts for approximately 8-12%. 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.

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行提純，純度可達99.73%。

The raw material of petroleum naphthalene comes from the heavy aromatic components of catalytic reforming, catalytic cracking, and hydrocarbon cracking processes. In catalytic reforming oil, the content of methyl naphthalene 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，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.

用途

purpose

工業(yè)精萘是基礎(chǔ)化工原料，主要用于生產(chǎn)減水劑、擴散劑，是生產(chǎn)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 mainly used in the production of water reducing agents and dispersants. It is a raw material for the production of synthetic resins, plasticizers, rubber antioxidants, surfactants, synthetic fibers, dyes, pharmaceuticals, and spices.

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