论文部分内容阅读
In this study,an ionic liquid (IL),1-butyl-2,3-dimmmethylimidazolium hexafluorophosphate ([Bmmim][PF6]),was used in combination with a composite solvent of methyl acetate and n-heptane to enhance the oil extraction from oily sludge.The oil recovery increased by approximately 15％ compared with that of solvent extraction without[Bmmim][PF6]at the optimal ratios of IL to sludge and solvents to sludge,which were at 2:5 (M/M) and 4∶1 (WM),respectively.The saturate,aromatic,resin and asphaltene (SARA) analysis revealed that the recovery of resins and asphaltenes was increased by 14％ and 38％,respectively,in the solvent extraction with the addition of[Bmmim][PF6].[Bmmim][PF6]maintained a good performance after its reuse four times.The addition of[Bmmim][PF6]changed the adhesion forces between oil and soil.The IL-assisted solvent extraction procedure followed the pseudo second-order kinetic model,while the unassisted solvent extraction procedure followed the pseudo first-order kinetic model.The results also demonstrated that[Bmmim][PF6]decreased the solvent consumption by approximately 60％ each time.Additionally,[Bmmim][PF6]can be easily separated.The results suggested that enhancing the solvent extraction with this IL is a promising way to recover oil from oily sludge with a higher oil recovery rate and lower organic solvent consumption than those with the unassisted solvent extraction method.