No matter which fraction, it contains acidic, alkaline and neutral components. Some of the boiling points are similar to those of naphthalene, which is easy to be mixed into industrial naphthalene during distillation and affect product quality. In order to ensure the quality of industrial naphthalene, alkali washing and acid washing are required before distillation. The fraction after alkali washing and acid washing treatment is called washed naphthalene oil fraction, washed naphthalene washed binary fraction or washed phenol naphthalene washed ternary fraction. These washed fractions can be used as raw materials for industrial naphthalene production.

但在實際生產中，若用只經堿洗不經酸洗的混合餾分進行精餾，原料中的吡啶堿類大多轉入酚油和精餾殘油（洗油）中，而工業萘中僅有0.1%左右，基本上不影響萘的質量，因此某些焦化廠采用堿洗后的餾分精餾生產工業

However, in actual production, if the mixed distillate which is only subject to alkali washing and not subject to acid washing is used for distillation, most of the pyridine bases in the raw material are transferred into the phenol oil and distillation residual oil (wash oil), while only about 0.1% of the industrial naphthalene does not affect the quality of naphthalene, so some coking plants use the distillate distillation after alkali washing to produce industrial naphthalene

萘，對切取出酚油、洗油，再分別進行酸洗提取重吡啶堿類。當生產規模較小不需要提取重吡啶類產品時，也可不用硫酸洗滌。

Naphthalene, cut out phenol oil and wash oil, and then conduct acid pickling to extract dipyridine bases. When the production scale is small and there is no need to extract heavy pyridine products, sulfuric acid washing can also be avoided.

由于目前工業萘大部分用于制取鄰苯二甲酸酐（苯酐），隨著苯酐生產的工藝改進，含有少量不飽和化合物的工業蔡，對苯酐產品質量及觸媒催化劑性能均無不良影響。因此，現在許多廠都用只經堿洗的原料餾分提取工業萘。

At present, most of the industrial naphthalene is used to produce phthalic anhydride (phthalic anhydride). With the improvement of the production process of phthalic anhydride, the industrial naphthalene containing a small amount of unsaturated compounds has no adverse effect on the quality of phthalic anhydride products and the performance of catalyst. Therefore, many factories now extract industrial naphthalene from raw material fractions that have only been washed by alkali.

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