TY - JOUR
T1 - Effect of 1-carboxymethyl-3-methylimidazolium chloride ionic liquid on thermodynamic and solubility of l-threonine in water at 298.15K and atmospheric pressure
AU - Zafarani-Moattar, Mohammed Taghi
AU - Asadzadeh, Behnaz
N1 - Funding Information:
We are grateful to University of Tabriz Research Council for the financial support of this research.
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2014/10/15
Y1 - 2014/10/15
N2 - 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 298.15K 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 298.15K 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-solute interactions, transfer Gibbs free energies (δGtr) of amino acid from water to aqueous IL solutions have been 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 298.15K.
AB - 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 298.15K 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 298.15K 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-solute interactions, transfer Gibbs free energies (δGtr) of amino acid from water to aqueous IL solutions have been 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 298.15K.
KW - Ionic liquid
KW - L-Threonine
KW - Solubility
KW - Transfer Gibbs free energies
KW - Water activity
UR - http://www.scopus.com/inward/record.url?scp=84918569639&partnerID=8YFLogxK
U2 - 10.1016/j.fluid.2014.07.001
DO - 10.1016/j.fluid.2014.07.001
M3 - Article
AN - SCOPUS:84918569639
SN - 0378-3812
VL - 379
SP - 86
EP - 95
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
ER -