Development of an Activity Coefficient Model for the Aqueous Amino Acid Solution

Abstract

The enthalpy and solubility of aqueous amino acid solutions are essential thermodynamic properties for the modeling of heat and mass balance, and these properties can be estimated by considering the activity coefficient in thermodynamic calculations. In this study, the parameters of a non-random two-liquid model were identified using heat capacity and solubility data together to calculate the acceptable activity coefficient for an aqueous amino acid system. As a result, a highly accurate activity coefficient model of an aqueous amino acid solution was developed, and inaccurate alternative solutions regressed with heat capacity or solubility only can be avoided. The parameters of an NRTL model were identified using heat capacity and solubility data together to calculate the acceptable activity coefficient for an aqueous amino acid system. A highly accurate activity coefficient model of an aqueous amino acid solution was developed, and inaccurate alternative solutions regressed with the heat capacity or solubility only can be avoided.