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采用减压蒸馏及初馏分皂化萃取脱油脱色工艺，可以将２号石油环烷酸的质量提高为１号石油环烷酸．精制产品满足涂料工业及特种用途对石油环烷酸质量指标的要求，总收率可达６７％．经过大量实验摸索出一套比较成熟可靠的工艺条件．所用萃取剂价廉易得，并可回收循环使用．
Using vacuum distillation and initial fractionation saponification extraction de-oiling and bleaching process, No. 2 petroleum naphthenic acid can be upgraded to No.1 naphthenic acid. Refined products to meet the paint industry and special purposes naphthalene naphthenic acid quality requirements, the total yield of up to 67%. After a large number of experiments to explore a more mature and reliable process conditions. The extractant used is cheap and recyclable.