Engine oils are contaminated with hazardous species resulted from the oxidative degradation, which cause serious environmental issues. In this study, the extraction of useful hydrocarbons (HCs) from used engine oil through solvent extraction followed by separation in a column via adsorption is reported. n-Hexane, toluene, ethyl acetate, and their mixture (ethyl acetate/n-hexane) were used as solvent for extraction over powdered silica packed column, and the extracted samples were analyzed through thin layer chromatography, gas chromatography–mass spectrometry and Fourier transform infra-red spectroscopic techniques. Useful HCs like 1-fluoro heptane, n-hexane, methyl cyclopentane, toluene, p-xylene, o-xylene, toluene, benzaldehyde, 2,3-dimethyl pentane, and benzene-1,2-dicarboxylic acid were identified and subsequently distilled with respective percent recovery of 91, 71, 46, 45, 18, 08, 07, 06, 04 and 02%. The reported HC derivatives were obtained by interacting the sample oil with non-polar solvents (n-hexane and toluene) and slightly polar solvent (10% ethyl acetate/n-hexane mixture) in column which extracted the compounds having similar chemical nature in an appreciable amount via Londer dispersion forces and dipole-dipole interactions. The findings of this study concluded that the extraction of valuable benzene derivatives through highly cost-effective solvent extraction strategy is a promising alternative to the conventional burning and reclamation of spent engine oil. Witnessing the high efficiency and cost-effectiveness of the current process, it could be extended to the extraction of other useful compounds from used oils and concomitantly alleviating the related environmental pollution on larger scale.

发动机油被氧化降解产生的有害物质污染，这会导致严重的环境问题。在这项研究中，报道了通过溶剂萃取从用过的发动机油中提取有用的碳氢化合物 (HC)，然后通过吸附在色谱柱中进行分离。Ñ己烷，甲苯，乙酸乙酯以及它们的混合物（乙酸乙酯/ Ñ己烷）被用来作为溶剂萃取过粉末二氧化硅填充柱，并且将提取的样品通过薄层色谱，气相色谱-质谱法和傅立叶分析变换红外光谱技术。有用的HC等1-氟庚烷，Ñ正己烷，甲基环戊烷，甲苯，p二甲苯，ö-二甲苯、甲苯、苯甲醛、2,3-二甲基戊烷和苯-1,2-二羧酸被鉴定并随后蒸馏，回收率分别为91、71、46、45、18、08、07、06、04和 02%。所报告的HC衍生物通过用非极性溶剂（交互的样本油获得ñ -己烷和甲苯）和弱极性溶剂（10％乙酸乙酯/ Ñ-己烷混合物）在柱中通过 Londer 分散力和偶极-偶极相互作用以可观的量提取具有相似化学性质的化合物。这项研究的结果得出的结论是，通过具有成本效益的溶剂萃取策略来萃取有价值的苯衍生物是一种很有前景的替代方法，可以替代传统的废机油燃烧和回收。目睹当前工艺的高效率和成本效益，它可以扩展到从废油中提取其他有用的化合物，并同时在更大范围内缓解相关的环境污染。