工業(yè)萘的提純過程主要包括脫除雜質(zhì)及脫硫兩個步驟：

The purification process of industrial naphthalene mainly includes two steps: impurity removal and desulfurization:

1.脫除雜質(zhì)脫除雜質(zhì)是指去除工業(yè)萘中的不純物質(zhì)。精萘廠家為了提高工業(yè)萘的純度，通常采用冷沉淀法、汽提法、結(jié)晶法等方法進(jìn)行脫除。

1. Impurity removal refers to the removal of impure substances from industrial naphthalene. Refined naphthalene manufacturers usually use methods such as cold precipitation, stripping, and crystallization to improve the purity of industrial naphthalene.

（1）冷沉淀法：將工業(yè)萘按一定比例溶解在苯中，再用冷苯沉淀不溶性物質(zhì)，然后過濾，可去除多數(shù)不溶物質(zhì)。

(1) Cold precipitation method: Dissolve industrial naphthalene in a certain proportion in benzene, then precipitate insoluble substances with cold benzene, and then filter to remove most of the insoluble substances.

（2）汽提法：將工業(yè)萘加熱至其沸點，利用汽化、冷凝和分餾技術(shù)，可使萘蒸汽與不純物質(zhì)分離，從而實現(xiàn)脫除雜質(zhì)的目的。

(2) Stripping method: By heating industrial naphthalene to its boiling point and utilizing vaporization, condensation, and fractionation techniques, naphthalene vapor can be separated from impure substances, thereby achieving the purpose of removing impurities.

（3）結(jié)晶法：將工業(yè)萘按一定比例溶解在合適的溶劑中，然后在特定的溫度和壓力下結(jié)晶，通過結(jié)晶過程中的分離和過濾，可去除多數(shù)不溶性物質(zhì)。

(3) Crystallization method: Industrial naphthalene is dissolved in a suitable solvent in a certain proportion, and then crystallized at a specific temperature and pressure. Through separation and filtration during the crystallization process, most insoluble substances can be removed.

2.脫硫工業(yè)萘中的硫是工業(yè)廢氣中硫化物的主要來源，對于環(huán)境污染有一定的影響。因此，在工業(yè)萘的生產(chǎn)過程中，通常需要進(jìn)行脫硫處理。

2. Sulfur in desulfurization industrial naphthalene is the main source of sulfides in industrial waste gas, which has a certain impact on environmental pollution. Therefore, in the production process of industrial naphthalene, desulfurization treatment is usually required.

常用的脫硫方法有氧化脫硫法、堿性氧化法、酸性氧化法等。其中，氧化脫硫法是常用的方法。

The commonly used desulfurization methods include oxidation desulfurization, alkaline oxidation, acidic oxidation, etc. Among them, the oxidation desulfurization method is a commonly used method.

氧化脫硫法：將工業(yè)萘中的硫化物在氧氣或空氣條件下進(jìn)行氧化，其反應(yīng)式為：H2S+3/2O2→SO2+H2O。通常在反應(yīng)中加入氫氧化鈉或鈣醇等堿性物質(zhì)，可以加快反應(yīng)速率，從而達(dá)到脫硫的目的。

Oxidative desulfurization method: The sulfide in industrial naphthalene is oxidized under oxygen or air conditions, and the reaction formula is: H2S+3/2O2 → SO2+H2O. Usually, adding alkaline substances such as sodium hydroxide or calcium alcohol in the reaction can accelerate the reaction rate and achieve the goal of desulfurization.

經(jīng)過脫除雜質(zhì)及脫硫處理后，工業(yè)萘的純度可以達(dá)到較高水平，可以用于制備藥品、染料、涂料等多種化學(xué)物質(zhì)。更多事項就來我們網(wǎng)站http://mc-downloads.com咨詢吧！

After impurity removal and desulfurization treatment, the purity of industrial naphthalene can reach a high level and can be used to prepare various chemical substances such as pharmaceuticals, dyes, coatings, etc. For more information, come to our website http://mc-downloads.com Consult!