精萘的生產工藝主要有兩種，即工業萘精餾法和洗滌法。

There are two main production processes for refined naphthalene, namely industrial naphthalene distillation and washing.

工業萘精餾法是較為常見的一種生產工藝。首先，將煤焦油經過初步處理后得到的工業萘作為原料，送入精餾塔中。在精餾塔內，通過精確控制溫度和壓力等條件，利用工業萘中不同成分沸點的差異，將精萘從其他雜質中分離出來。這種方法生產效率較高，能夠得到純度較高的精萘，適合大規模的工業化生產。

Industrial naphthalene distillation is a common production process. Firstly, the industrial naphthalene obtained from the preliminary treatment of coal tar is used as raw material and sent to the distillation tower. In the distillation tower, by precisely controlling conditions such as temperature and pressure, and utilizing the differences in boiling points of different components in industrial naphthalene, refined naphthalene is separated from other impurities. This method has high production efficiency and can obtain high-purity refined naphthalene, which is suitable for large-scale industrial production.

洗滌法生產精萘則是另一種思路。先將工業萘與特定的洗滌劑進行混合，洗滌劑能夠與工業萘中的雜質發生化學反應，生成可溶于洗滌劑的物質。然后，通過洗滌、分離等步驟，將雜質從工業萘中去除，最終得到精萘。洗滌法雖然在生產過程中相對復雜一些，但對于一些對雜質種類和含量有特殊要求的精萘產品生產，具有獨特的優勢。

The production of refined naphthalene by washing method is another approach. First, mix industrial naphthalene with a specific detergent, which can react chemically with impurities in industrial naphthalene to generate substances soluble in the detergent. Then, impurities are removed from industrial naphthalene through washing, separation, and other steps, resulting in refined naphthalene. Although the washing method is relatively complex in the production process, it has unique advantages for the production of refined naphthalene products with special requirements for impurity types and contents.