Binary mixtures of HMIMPF6 ionic liquid and n-butyl acetate cosolvent in the extraction of acetone from aqueous solutions
A remarkable disadvantage of pure ionic liquids, to be used as a solvent in different processes, is their high viscosity and density. Here, n-butyl acetate was used as a cosolvent in the liquid-liquid system of {water + acetone + 1-hexyl-3-methylimidazolium hexafluorophosphate (HMIMPF 6 ) ionic liqu...
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Published in | Chemical engineering communications Vol. 205; no. 8; pp. 1096 - 1104 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Philadelphia
Taylor & Francis
03.08.2018
Taylor & Francis Ltd |
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Abstract | A remarkable disadvantage of pure ionic liquids, to be used as a solvent in different processes, is their high viscosity and density. Here, n-butyl acetate was used as a cosolvent in the liquid-liquid system of {water + acetone + 1-hexyl-3-methylimidazolium hexafluorophosphate (HMIMPF
6
) ionic liquid}. Mixtures of the ionic liquid and the cosolvent were used as the organic phase to extract acetone from aqueous phase. A drastic decrease in viscosity and a significant decrease in density of the ionic liquid were achieved in the presence of cosolvent. Accordingly, the liquid-liquid equilibrium of different provided systems was studied under temperature of 298.2 K and atmospheric pressure of 81.5 kPa. Binary phase regions and corresponding tie-lines and binodal curves were obtained for ternary and quaternary systems. Results show the extension of the binodal solubility region as well as enhancements up to 41.8% in the acetone separation factor. The tie-line data consistency was confirmed by the Othmer-Tobias and the Hand equations. Moreover, the nonrandom two-liquid model of activity coefficient was applied satisfactorily to reproduce the equilibrium data with a root-mean-square deviation of only 1.95%. |
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AbstractList | A remarkable disadvantage of pure ionic liquids, to be used as a solvent in different processes, is their high viscosity and density. Here, n-butyl acetate was used as a cosolvent in the liquid-liquid system of {water + acetone + 1-hexyl-3-methylimidazolium hexafluorophosphate (HMIMPF6) ionic liquid}. Mixtures of the ionic liquid and the cosolvent were used as the organic phase to extract acetone from aqueous phase. A drastic decrease in viscosity and a significant decrease in density of the ionic liquid were achieved in the presence of cosolvent. Accordingly, the liquid-liquid equilibrium of different provided systems was studied under temperature of 298.2 K and atmospheric pressure of 81.5 kPa. Binary phase regions and corresponding tie-lines and binodal curves were obtained for ternary and quaternary systems. Results show the extension of the binodal solubility region as well as enhancements up to 41.8% in the acetone separation factor. The tie-line data consistency was confirmed by the Othmer-Tobias and the Hand equations. Moreover, the nonrandom two-liquid model of activity coefficient was applied satisfactorily to reproduce the equilibrium data with a root-mean-square deviation of only 1.95%. A remarkable disadvantage of pure ionic liquids, to be used as a solvent in different processes, is their high viscosity and density. Here, n-butyl acetate was used as a cosolvent in the liquid-liquid system of {water + acetone + 1-hexyl-3-methylimidazolium hexafluorophosphate (HMIMPF 6 ) ionic liquid}. Mixtures of the ionic liquid and the cosolvent were used as the organic phase to extract acetone from aqueous phase. A drastic decrease in viscosity and a significant decrease in density of the ionic liquid were achieved in the presence of cosolvent. Accordingly, the liquid-liquid equilibrium of different provided systems was studied under temperature of 298.2 K and atmospheric pressure of 81.5 kPa. Binary phase regions and corresponding tie-lines and binodal curves were obtained for ternary and quaternary systems. Results show the extension of the binodal solubility region as well as enhancements up to 41.8% in the acetone separation factor. The tie-line data consistency was confirmed by the Othmer-Tobias and the Hand equations. Moreover, the nonrandom two-liquid model of activity coefficient was applied satisfactorily to reproduce the equilibrium data with a root-mean-square deviation of only 1.95%. |
Author | Saien, Javad Mohammadi Sarab Badieh, Marjan |
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SubjectTerms | Acetone Activity coefficients Binary mixtures Cosolvent extraction Ionic liquids Ions Liquid-liquid equilibrium Liquid-liquid extraction NRTL model physical properties Quaternary systems Solvents Viscosity |
Title | Binary mixtures of HMIMPF6 ionic liquid and n-butyl acetate cosolvent in the extraction of acetone from aqueous solutions |
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