Application of hydrophobic ionic liquid [Bmmim][PF6] in solvent extraction for oily sludge |
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Authors: | Lingfu Zhu Zuhong Lin Jie Tan Liyang Hu Tingting Zhang |
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Affiliation: | 1.College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2.Centre for Resource and Environmental Research, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract: | 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 (V/M), 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. |
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