| Abstract: | The thermodynamic properties (solubility, vapour pressure, density, viscosity, heat capacity and heat of mixing) of the H2O + CH3OH + LiBr + ZnCl2 (9:1 H2O:CH3OH and 1:1 LiBr:ZnCl2 by mass) system using H2O + CH3OH as the working media and LiBr + ZnCl2 as the absorbents were measured. The solubility data were obtained in the temperature range from 270.35 to 389.55 K. The measurements of vapour pressure, density, viscosity and heat capacity were carried out at various temperatures and absorbent concentrations. The differential heat of dilution and differential heat of solution at 298.15 K were measured for solutionw with absorbent concentrations from 0 to 75.2 wt%. The integral heat of mixing data at 298.15 K were obtained from both sets of experimental data. The integral heats of mixing for this quaternary system showed exothermic behaviour. The vapour pressure data were correlated with an Antoine-type equation. An empirical formula for the heat capacity was obtained from experimental data. The experimental data for the basic thermodynamic properties of this quaternary system were compared with those of the basic H2O + LiBr system. |
