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.

但在实际生产中，若用只经碱洗不经酸洗的混合馏分进行精馏，原料中的吡啶碱类大多转入酚油和精馏残油（洗油）中，而工业萘中仅有0.1%左右，基本上不影响萘的质量，因此某些焦化厂采用碱洗后的馏分精馏生产工业

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，对切取出酚油、洗油，再分别进行酸洗提取重吡啶碱类。当生产规模较小不需要提取重吡啶类产品时，也可不用硫酸洗涤。

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.

由于目前工业萘大部分用于制取邻苯二甲酸酐（苯酐），随着苯酐生产的工艺改进，含有少量不饱和化合物的工业蔡，对苯酐产品质量及触媒催化剂性能均无不良影响。因此，现在许多厂都用只经碱洗的原料馏分提取工业萘。

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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