工业萘的提纯过程主要包括脱除杂质及脱硫两个步骤：

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

1.脱除杂质脱除杂质是指去除工业萘中的不纯物质。精萘厂家为了提高工业萘的纯度，通常采用冷沉淀法、汽提法、结晶法等方法进行脱除。

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：将工业萘按一定比例溶解在苯中，再用冷苯沉淀不溶性物质，然后过滤，可去除多数不溶物质。

(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：将工业萘加热至其沸点，利用汽化、冷凝和分馏技术，可使萘蒸汽与不纯物质分离，从而实现脱除杂质的目的。

(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）结晶法：将工业萘按一定比例溶解在合适的溶剂中，然后在特定的温度和压力下结晶，通过结晶过程中的分离和过滤，可去除多数不溶性物质。

(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.脱硫工业萘中的硫是工业废气中硫化物的主要来源，对于环境污染有一定的影响。因此，在工业萘的生产过程中，通常需要进行脱硫处理。

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.

常用的脱硫方法有氧化脱硫法、碱性氧化法、酸性氧化法等。其中，氧化脱硫法是常用的方法。

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

氧化脱硫法：将工业萘中的硫化物在氧气或空气条件下进行氧化，其反应式为：H2S+3/2O2→SO2+H2O。通常在反应中加入氢氧化钠或钙醇等碱性物质，可以加快反应速率，从而达到脱硫的目的。

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.

经过脱除杂质及脱硫处理后，工业萘的纯度可以达到较高水平，可以用于制备药品、染料、涂料等多种化学物质。更多事项就来我们网站http://www.jnjdbc.cn咨询吧！

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://www.jnjdbc.cn Consult!