Application of hydrophobic ionic liquid [Bmmim][PF<sub>6</sub>] in solvent extraction for oily sludge

Lingfu Zhu; Zuhong Lin; Jie Tan; Liyang Hu; Tingting Zhang

doi:10.1016/j.cjche.2020.03.014

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

Separation Science and Engineering | Updated：2026-01-06

- Application of hydrophobic ionic liquid [Bmmim][PF₆] in solvent extraction for oily sludge
- Chinese Journal of Chemical Engineering Vol. 28, Issue 9, Pages: 2294-2300(2020)
- Affiliations：
  
  1. College of Chemical Engineering, Beijing University of Chemical Technology,Beijing,China,100029
  2. Centre for Resource and Environmental Research, Beijing University of Chemical Technology,Beijing,China,100029
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2020.03.014
  CLC：
- Published：2020
- Accepted：
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] in solvent extraction for oily sludge[J]. 中国化学工程学报, 2020, 28(9): 2294-2300.
DOI：

] in solvent extraction for oily sludge[J]. 中国化学工程学报, 2020, 28(9): 2294-2300. DOI： 10.1016/j.cjche.2020.03.014.

摘要

Abstract

In this study

an ionic liquid (IL)

1-butyl-2

3-dimmmethylimidazolium hexafluorophosphate ([Bmmim

]

[PF

]

)

was used in combination with a composite solvent of methyl acetate and

-heptane to enhance the oil extraction from oily sludge. The oil recovery increased by approximately 15% compared with that of solvent extraction without [Bmmim

]

[PF

]

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

]

[PF

]

. [Bmmim

]

[PF

]

maintained a good performance after its reuse four times. The addition of [Bmmim

]

[PF

]

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

]

[PF

]

decreased the solvent consumption by approximately 60% each time.

Additionally

[Bmmim

]

[PF

]

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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⁰

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

DOI：10.1016/j.cjche.2020.03.014

摘要

Abstract

关键词

Keywords

references

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