Application of hydrophobic ionic liquid [Bmmim][PF6] in solvent extraction for oily sludge  

作　　者：Lingfu Zhu Zuhong Lin Jie Tan Liyang Hu Tingting Zhang 

机构地区：[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

出　　处：《Chinese Journal of Chemical Engineering》2020年第9期2294-2300,共7页中国化学工程学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Nos.41807133 and 41977142);the special fund of State Key Joint Laboratory of Environment Simulation and Pollution Control(No.18K05ESPCT);the Fundamental Research Funds for the Central Universities(PT1915)。

摘　　要：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.

关 键 词：Oily sludge Ionic liquid Solvent extraction Oil component Kinetic model 

分 类 号：O658.2[理学—分析化学] X703[理学—化学]