Abstract
In this study, the heat capacities of ternary systems of salt/glycol/H2O and buffer/glycol/H2O were measured over the temperature range 30 to 80℃ and different solute concentrations: salt/buffer (4.0, 9.0, 16.0 wt %) + glycol (40 wt %) using a heat flow differential scanning calorimeter (DSC). The salt was magnesium chloride (MgCl2．6H2O) ; the buffers were N-[tris(hydroxymethyl)methyl] -3-aminopropanesulfonic acid (TAPS) and tris (hydroxymethyl) amionmethane (TRIS); and the glycols were diethylene glycol (DEG), triethylene glycol (TEG), tetraethylene glycol (T4EG), propylene glycol (PG), tripropylene glycol (TPG), dipropylene glycol (DPG). For the pure system, the dependence of the molar heat capacity with temperature was correlated by a second order equation. The binary system of TPG + H2O for molar heat capacities and excess molar heat capacities were using a Redlich-Kister-type equation. The data were then reported as functions of temperature and composition. For the ternary systems, an equation proposed by Sohnel and Novotny was used to represent the measured heat capacity data. Results showed that the measured heat capacity data were satisfactorily correlated using the applied correlations. Therefore, results presented in this are, in general, of sufficient accuracy for most engineering-design calculations
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