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减一线油馏分中部分可作为化工轻油。将部分减一线油打入常压塔，参与常压精馏，相当于将蜡油中的轻油再回收。为了不影响化工轻油质量，采取部分回炼的方法。回炼量为５．５ｔ／ｈ。经标定回炼油对常压塔及产品质量没造成不良影响，轻油收率提高了１个百分点，年经济效益４００余万元。
Some minus the first line of oil distillate can be used as chemical light oil. Will be part of the first line of oil into the atmospheric tower, to participate in atmospheric distillation, the equivalent of light oil in the wax and then recovered. In order not to affect the quality of chemical light oil, take part of the method of recycling. The amount of refining is 5.5t / h. Refined oil on the atmospheric tower and product quality did not cause adverse effects, light oil yield increased by 1 percentage point, the annual economic benefits of 400 million.