Binary mixtures of HMIMPF6 ionic liquid and n-butyl acetate cosolvent in the extraction of acetone from aqueous solutions. Issue 8 (3rd August 2018)

• Record Type: Journal Article
• Authors: Mohammadi Sarab Badieh, Marjan; Saien, Javad
• Is Part Of: Chemical engineering communications. Volume 205:Issue 8(2018)
• Page Start: 1096
• Page End: 1104
• Publication Date: 2018-08-03
• Subjects: Cosolvent -- extraction -- ionic liquids -- liquid–liquid equilibrium -- NRTL model -- physical properties; Chemical engineering -- Periodicals; 660.205
• DOI: 10.1080/00986445.2018.1433665
• Languages: English
• ISSNs: 0098-6445

Abstract

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 (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%.