Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Isomer effect in the separation of octane and xylenes using the ionic liquid 1-ethyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide

Arce, A.[Alberto], Earle, M. J.[Martyn J.], Rodriguez, H.[Hector], Seddon, K. R.[Kenneth R.], Soto, A.[Ana]
Fluid Phase Equilib. 2010, 294, 1-2, 180-186
ABSTRACT
The liquid liquid equilibria of three ternary systems comprising the aliphatic hydrocarbon octane, an aromatic hydrocarbon 1,n-(CH3)2C6H4 (where n takes the values 2, 3, or 4; that is, o-xylene, m-xylene, or p-xylene), and the ionic liquid 1-ethyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide ([C2mim][NTf2]), were experimentally determined at 25 deg C. The results show a more favourable distribution ratio towards the ionic liquid-rich phase for 1,2-(CH3)2C6H4 than for 1,3-(CH3)2C6H4 or 1,4-(CH3)2C6H4. Although selectivity values prove that it is feasible to separate the aliphatic and aromatic hydrocarbons by using [C2mim][NTf2] as solvent, no significant differences are observed in the selectivity among systems. Thus, the proposed ionic liquid does not look suitable to perform the separation of the different xylene isomers in a mixture. The experimental data were satisfactorily correlated by means of the classical non-random two-liquid (NRTL) model.
Compounds
# Formula Name
1 C8H18 octane
2 C8H10 1,2-dimethylbenzene
3 C8H10 1,3-dimethylbenzene
4 C8H10 1,4-dimethylbenzene
5 C8H11F6N3O4S2 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide
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
  • 2
  • 1
  • 5
  • Mole fraction - 1 ; Liquid mixture 2
  • Mole fraction - 1 ; Liquid mixture 1
  • Mole fraction - 2 ; Liquid mixture 1
  • Mole fraction - 2; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • H NMR spectroscopy
  • H NMR spectroscopy
  • H NMR spectroscopy
  • 10
  • POMD
  • 3
  • 1
  • 5
  • Mole fraction - 1 ; Liquid mixture 2
  • Mole fraction - 1 ; Liquid mixture 1
  • Mole fraction - 3 ; Liquid mixture 1
  • Mole fraction - 3; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • H NMR spectroscopy
  • H NMR spectroscopy
  • H NMR spectroscopy
  • 11
  • POMD
  • 4
  • 1
  • 5
  • Mole fraction - 1 ; Liquid mixture 2
  • Mole fraction - 1 ; Liquid mixture 1
  • Mole fraction - 4 ; Liquid mixture 1
  • Mole fraction - 4; Liquid mixture 2
  • Temperature, K; Liquid mixture 2
  • Pressure, kPa; Liquid mixture 2
  • Liquid mixture 2
  • Liquid mixture 1
  • H NMR spectroscopy
  • H NMR spectroscopy
  • H NMR spectroscopy
  • 13