Abstract: The oxidation⁃extraction process was used to desulfurize of the visbreaking diesel oil, O3 was used as oxidant, formic acid was used as catalyst, and polar oxides such as sulfoxide and sulfone were extracted and separated from diesel oil by polar organic solvent. The effects of oxidation time, oxidation temperature, ratio of extractant to oil and amount of formic acid on the desulfurization rate of diesel oil in the reaction system were investigated, and the optimum reaction conditions were determined. The results showed that the sulfur content of visbreaking diesel oil decreased from 4 980 μg/g to 490 μg/g and the desulfurization rate was 90%. By comparing the properties of visbreaking diesel oil before and after oxidation, it can be concluded that the oxidation⁃extraction method can also improve the chromaticity and acidity of visbreaking diesel oil.

Key words: Visbreaking diesel oil, Oxidation desulfurization, Extraction, Diesel fuel properties

摘要： 采用氧化⁃萃取法对减黏裂化柴油进行脱硫研究。使用O₃为氧化剂，甲酸为催化剂，并用极性有机溶剂萃取分离柴油中含硫化合物氧化反应生成的亚砜、砜类等极性氧化物。考察了反应体系中氧化时间、氧化温度、萃取剂油体积比以及甲酸质量分数对柴油脱硫率的影响，并确定了最佳工艺条件。结果表明，在氧化⁃萃取工艺条件下，减黏裂化柴油的硫质量分数由4 980 μg/g降低至490 μg/g，脱硫率为90%。通过对减黏裂化柴油氧化前后的性质对比可知，氧化⁃萃取法可以改善减黏裂化柴油的色度和酸值等性能。

关键词: 减黏裂化柴油, 　氧化脱硫, 　萃取, 　柴油性质