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 about 8-12%. Naphthalene oil fraction with a temperature range of 210-230 ℃ is cut from the side line of the tar distillation tower, washed and dephenolized, and then distilled to separate the light components. Industrial naphthalene with a freezing point of 78 ℃ and a purity of 96% is obtained.

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%), methylnaphthalene (1-2%), and a small amount of indene, tar base, and tar acid. After further pickling and distillation, refined naphthalene with a sulfur content of less than 0.1% and a freezing point of 79 ℃ can be obtained. If further refining is required to reduce the sulfur content 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，精萘廠家給您提出參考：

The process for small batch production of refined naphthalene from industrial naphthalene is as follows. The refined naphthalene manufacturer provides you with reference:

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。

Add sulfuric acid to molten naphthalene for dehydration, stir, and then stand still to separate the waste acid. Add another 98% sulfuric acid, stir at 85-95 ℃ for 40 minutes, and stand still to separate the waste acid. Add 37% formaldehyde solution under stirring and stir for 50 minutes at 85-95 ℃. 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 spent alkali after standing. After distillation and cooling, refined naphthalene products can be obtained.

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(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，后進一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 feedstock for petroleum naphthalene comes from the heavy aromatic components of catalytic reforming, catalytic cracking, and hydrocarbon cracking processes. The content of methylnaphthalene in catalytic reforming oil is about 55%. First, various homologues of naphthalene are separated from the raw material fraction through extraction and adsorption. Then, a catalytic hydrodealkylation process is used, using Cr2O3-Al2O3 as a catalyst, to undergo a hydrodemethylation reaction at 400-800 ℃ and 0.5-7 MPa. After the reaction product is cooled by the gaseous phase material, the light components such as benzene, toluene, and xylene are removed by distillation. After that, petroleum naphthalene products can be obtained by further distillation. The product is purified by solvent absorption and solvent washing, with a purity of 99.73%.

用工業(yè)萘小批量生產(chǎn)精萘的流程相關(guān)內(nèi)容就講解到這里了，您對此有怎樣的疑惑或者需求就來我們網(wǎng)站http://www.benxi333.com咨詢了解吧！

That's all about the process of producing refined naphthalene in small batches using industrial naphthalene. If you have any doubts or needs about this, please come to our website http://www.benxi333.com Consult and understand!