ABSTRACT

During recent last years, outstanding properties of ionic liquids such as low melting point, large liquid range and negligible volatility have turned them into possible volatile organic solvents replacers to break alcohol-alkane azeotropic mixtures. On this basis, two ionic liquids, butyltrimethylammoniumbis(trifluoromethylsulfonyl) imide, [BTMA][NTf2], and tributylmethylammoniumbis(trifluoromethylsulfonyl)imide, [TBMA][NTf2], were studied through ternary liquid+liquid equilibrium (LLE) of {alkane(1) + alcohol (2) + IL(3)} at T = 298.15 K and atmospheric pressure in order to consider the effect of ionic liquid cation alkyl chain length on the extraction process. The ILs capability as azeotrope breakers was determined by the calculation of parameters such as solute distribution ratio, b, and selectivity, S and this capability was compared with other bis (trifluoromethylsulfonyl) imide based ionic liquids from literature. The consistency of tie-line data was ascertained by applying the Othmer Tobias and Hand equations. Finally, the experimental LLE were correlated by the Non Random Two Liquid (NRTL) thermodynamic model.

Compounds

#	Formula	Name
1	C9H18F6N2O4S2	butyltrimethylammonium bis(trifluoromethylsulfonyl)imide
2	C15H30F6N2O4S2	tributylmethylammonium bis((trifluoromethyl)sulfonyl)imide
3	C7H16	heptane
4	C6H14	hexane
5	CH4O	methanol
6	C2H6O	ethanol

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	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	1	Refractive index (Na D-line) ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Standard Abbe refractometry	1
POMD	2	Mass density, kg/m3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	2	Refractive index (Na D-line) ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Standard Abbe refractometry	1
POMD	3	Mass density, kg/m3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	3	Refractive index (Na D-line) ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Standard Abbe refractometry	1
POMD	4	Mass density, kg/m3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	4	Refractive index (Na D-line) ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Standard Abbe refractometry	1
POMD	5	Mass density, kg/m3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	5	Refractive index (Na D-line) ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Standard Abbe refractometry	1
POMD	6	Mass density, kg/m3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Vibrating tube method	1
POMD	6	Refractive index (Na D-line) ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid	Standard Abbe refractometry	1
POMD	6 4 1	Mole fraction - 4 ; Liquid mixture 1 Mole fraction - 4 ; Liquid mixture 2 Mole fraction - 6 ; Liquid mixture 2	Mole fraction - 6; Liquid mixture 1	Temperature, K; Liquid mixture 2 Pressure, kPa; Liquid mixture 2	Liquid mixture 1 Liquid mixture 2	Density calibration data Density calibration data Density calibration data	7
POMD	6 3 1	Mole fraction - 3 ; Liquid mixture 1 Mole fraction - 3 ; Liquid mixture 2 Mole fraction - 6 ; Liquid mixture 2	Mole fraction - 6; Liquid mixture 1	Temperature, K; Liquid mixture 2 Pressure, kPa; Liquid mixture 2	Liquid mixture 1 Liquid mixture 2	Density calibration data Density calibration data Density calibration data	6
POMD	5 4 1	Mole fraction - 4 ; Liquid mixture 1 Mole fraction - 4 ; Liquid mixture 2 Mole fraction - 5 ; Liquid mixture 2	Mole fraction - 5; Liquid mixture 1	Temperature, K; Liquid mixture 2 Pressure, kPa; Liquid mixture 2	Liquid mixture 1 Liquid mixture 2	Density calibration data Density calibration data Density calibration data	6
POMD	6 4 2	Mole fraction - 4 ; Liquid mixture 1 Mole fraction - 4 ; Liquid mixture 2 Mole fraction - 6 ; Liquid mixture 2	Mole fraction - 6; Liquid mixture 1	Temperature, K; Liquid mixture 2 Pressure, kPa; Liquid mixture 2	Liquid mixture 1 Liquid mixture 2	Density calibration data Density calibration data Density calibration data	8
POMD	6 3 2	Mole fraction - 3 ; Liquid mixture 1 Mole fraction - 3 ; Liquid mixture 2 Mole fraction - 6 ; Liquid mixture 2	Mole fraction - 6; Liquid mixture 1	Temperature, K; Liquid mixture 2 Pressure, kPa; Liquid mixture 2	Liquid mixture 1 Liquid mixture 2	Density calibration data Density calibration data Density calibration data	7
POMD	5 4 2	Mole fraction - 4 ; Liquid mixture 1 Mole fraction - 4 ; Liquid mixture 2 Mole fraction - 5 ; Liquid mixture 2	Mole fraction - 5; Liquid mixture 1	Temperature, K; Liquid mixture 2 Pressure, kPa; Liquid mixture 2	Liquid mixture 1 Liquid mixture 2	Density calibration data Density calibration data Density calibration data	7

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Cation effect of ammonium imide based ionic liquids in alcohols extraction from alcohol-alkane azeotropic mixtures

Aranda, N. M.[Nuria M.], Gonzalez, B.[Begona]

ABSTRACT