ABSTRACT

Vapor-liquid equilibrium data (water activity, vapor pressure and osmotic coefficient) of the mixed aqueous solutions, L-threonine + 1-carboxymethyl-3-methylimidazolium chloride and the corresponding binary aqueous amino acid solutions have been measured by the isopiestic method at temperature 298.15 K and atmospheric pressure. The experimental data for the activity of water were accurately correlated with segment-based local composition models of the Wilson, NRTL, modified NRTL and NRF-NRTL. From these data, the corresponding activity coefficients have been calculated. For the same system, the solubility of the L-threonine at various ionic liquid (IL) concentrations was measured at 298.15 K using gravimetric method. Also the above local composition models were used to describe the solubility of amino acid in pure water and in aqueous IL solutions. To provide information regarding solute soluteinteractions, transfer Gibbs free energies (delta-G_tr) of amino acid from water to aqueous IL solutions havebeen determined from the solubility measurements and activity coefficient of amino acid in water and [Cmmim][Cl] + water solutions calculated from different models, as a function of IL concentration at 298.15 K.

Compounds

#	Formula	Name
1	C6H9ClN2O2	1-carboxymethyl-3-methylimidazolium chloride
2	C4H9NO3	L-threonine
3	ClNa	sodium chloride
4	H2O	water

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 3 4	(Relative) activity - 4 ; Liquid	Molality, mol/kg - 2; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Isopiestic method	7
POMD	2 3 4	Vapor or sublimation pressure, kPa ; Liquid	Molality, mol/kg - 2; Liquid Molality, mol/kg - 3; Liquid	Temperature, K; Liquid	Liquid Gas	Isopiestic method	7
POMD	3 4 1	(Relative) activity - 4 ; Liquid	Molality, mol/kg - 1; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Isopiestic method	7
POMD	3 4 1	Vapor or sublimation pressure, kPa ; Liquid	Molality, mol/kg - 1; Liquid Molality, mol/kg - 3; Liquid	Temperature, K; Liquid	Liquid Gas	Isopiestic method	7
POMD	2 4 1	Mass ratio of solute to solvent - 2 ; Liquid	Molality, mol/kg - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Crystal - 2	Gravimetric Method	6

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Effect of 1-carboxymethyl-3-methylimidazolium chloride ionic liquid on thermodynamic and solubility of L-threonine in water at 298.15 K and atmospheric pressure

Zafarani-Moattar, M. T.[Mohammed Taghi], Asadzadeh, B.[Behnaz]

ABSTRACT