ABSTRACT

Two imidazolium-based ionic liquids: 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) and 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIM][BF4]) were studied as entrainer candidates for the separation of methanol + acetonitrile system. Isobaric vapor liquid equilibrium (VLE) for the binary methanol + acetonitrile and the ternary mixtures containing imidazolium-based ionic liquids were determined at atmospheric pressure (101.3 kPa). The experimental VLE results indicated ionic liquids (ILs) studied both showed a crossover salting effect for methanol. More importantly, when the amount of IL added increases, the azeotropic point of methanol + acetonitrile will disappear at one specific content. Meanwhile, the separation capacity of imidazolium-based ionic liquids follows the order: [OMIM][BF4] greater than [EMIM][BF4]. Finally, two different excess Gibbs free energy models were used to correlate the VLE data: the non-random two-liquid (NRTL), and the universal quasi-chemical (UNIQUAC).

Compounds

#	Formula	Name
1	CH4O	methanol
2	C2H3N	acetonitrile
3	C6H11BF4N2	1-ethyl-3-methylimidazolium tetrafluoroborate
4	C12H23BF4N2	1-methyl-3-octylimidazolium tetrafluoroborate

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	1	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	1	Normal boiling temperature, K ; Liquid			Liquid Gas	Ebulliometric method (Recirculating still)	1
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	2	Normal boiling temperature, K ; Liquid			Liquid Gas	Ebulliometric method (Recirculating still)	1
POMD	1 2	Boiling temperature at pressure P, K ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	15
POMD	1 2	Mole fraction - 1 ; Gas	Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Gas Liquid	Chromatography	15
POMD	1 2 3	Mole fraction - 3 ; Liquid Mole fraction - 3 ; Gas Mole fraction - 1 ; Gas	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Gravimetric method Gravimetric method Gravimetric method	30
POMD	1 2 4	Mole fraction - 4 ; Liquid Mole fraction - 4 ; Gas Mole fraction - 1 ; Gas	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Gravimetric method Gravimetric method Gravimetric method	30

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Measurement and correlation of the vapor-liquid equilibrium for methanol + acetonitrile + imidazolium-based ionic liquids at 101.3 kPa

Li, Q.[Qing], Zhu, W.[Wei], Liu, B.[Bing], Fan, Z.[Zenglu], Zhu, Y.[Yumeng], Gao, Z.[Ziwei]

ABSTRACT