Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Study of the suitability of two ammonium-based ionic liquids for the extraction of benzene from its mixtures with aliphatic hydrocarbons.

Requejo, P. F.[Patricia F.], Calvar, N.[Noelia], Gomez, E.[Elena], Dominguez, A.[Angeles]
Fluid Phase Equilib. 2016, 426, 17-24
ABSTRACT
The ammonium-based ionic liquids butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, [N4111][NTf2] and tributylmethylammonium bis(trifluoromethylsulfonyl)imide, [N4441][NTf2] have been studied as separation agents on the extraction of benzene from its mixtures with the long chain aliphatic hydrocarbons octane, decane and dodecane. The liquid-liquid equilibria of the ternary systems {octane (1) + benzene (2) + [N4111][NTf2] (3)}, {decane (1) + benzene (2) + [N4111][NTf2] (3)}, {dodecane (1) + benzene (2) + [N4111][NTf2] (3)} and {dodecane (1) + benzene (2) + [N4441][NTf2] (3)} at T = 298.15 K and {octane (1) + benzene (2) + [N4441][NTf2] (3)} at T = (298.15, 308.15 and 318.15) K and atmospheric pressure were determined. From the experimental results, an analysis of the influence of the cation of the ammonium-based ionic liquids and the alkyl chain length of the aliphatic hydrocarbons was performed; together with a study of the effect of the temperature on the liquid-liquid extraction of benzene. The extraction effectiveness was evaluated by the calculation of solute distribution ratio and selectivity derived from the tie-lines compositions. Besides, a comparison of the obtained results with those found in literature for systems with sulfolane, which is the most industrially used solvent, was performed. Finally, the experimental tie-lines were correlated using the NRTL thermodynamic model.
Compounds
# Formula Name
1 C9H18F6N2O4S2 butyltrimethylammonium bis(trifluoromethylsulfonyl)imide
2 C15H30F6N2O4S2 tributylmethylammonium bis((trifluoromethyl)sulfonyl)imide
3 C6H6 benzene
4 C8H18 octane
5 C10H22 decane
6 C12H26 dodecane
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 1
  • POMD
  • 2
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 1
  • POMD
  • 3
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 1
  • POMD
  • 3
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 2
  • POMD
  • 4
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 1
  • POMD
  • 4
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 2
  • POMD
  • 5
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 1
  • POMD
  • 6
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 1
  • POMD
  • 3
  • 4
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Mole fraction - 4; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Vibrating tube method
  • 22
  • POMD
  • 3
  • 4
  • 1
  • Mole fraction - 4 ; Liquid mixture 2
  • Mole fraction - 3 ; Liquid mixture 1
  • Mole fraction - 4 ; Liquid mixture 1
  • Mole fraction - 3; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Density calibration data
  • Density calibration data
  • Density calibration data
  • 15
  • POMD
  • 3
  • 5
  • 1
  • Mole fraction - 5 ; Liquid mixture 2
  • Mole fraction - 3 ; Liquid mixture 1
  • Mole fraction - 5 ; Liquid mixture 1
  • Mole fraction - 3; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Density calibration data
  • Density calibration data
  • Density calibration data
  • 10
  • POMD
  • 3
  • 6
  • 1
  • Mole fraction - 6 ; Liquid mixture 2
  • Mole fraction - 3 ; Liquid mixture 1
  • Mole fraction - 6 ; Liquid mixture 1
  • Mole fraction - 3; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Chromatography
  • Chromatography
  • Chromatography
  • 10
  • POMD
  • 3
  • 6
  • 2
  • Mole fraction - 6 ; Liquid mixture 2
  • Mole fraction - 3 ; Liquid mixture 1
  • Mole fraction - 6 ; Liquid mixture 1
  • Mole fraction - 3; Liquid mixture 2
  • Temperature, K; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • Chromatography
  • Chromatography
  • Chromatography
  • 9
  • POMD
  • 3
  • 4
  • 2
  • Mole fraction - 4 ; Liquid mixture 1
  • Mole fraction - 4 ; Liquid mixture 2
  • Mole fraction - 3 ; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Mole fraction - 3; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 1
  • Liquid mixture 2
  • Density calibration data
  • Density calibration data
  • Density calibration data
  • 30