activity coefficients

Using a semi-empirical model, the vapor-liquid equilibrium is described in the dimethylzinc-dimethyl telluride system: the activity coefficients of the solution components and the partial-molar heats of mixing at infinite dilution are calculated. The primary data for the application of the semi-empirical model were obtained by us from measuring the temperature dependence of the saturated vapor pressure of highly pure samples of dimethylzinc, dimethyl telluride and their solutions.

The saturated vapor pressure of butyl methacrylate solutions in acetonitrile, benzene, hexane and 1,2-diclorethane was measured by static tensimetric method in the temperature range of 291–351 K. The composition of the equilibrium phases and the activity factors were received from the experimental measurements of the temperature-dependent saturated vapor pressure. We then used the temperature and concentration dependent activity factors to calculate the thermodynamic functions of mixing of the solutions.

The saturated vapor pressure of the acrylic acid solutions in 1,2-dichloroethane and acetic acid was measured by static tensimetric method in the temperature range of 295 to 355 K. The composition of the equilibrium phases as well as the activity coefficients (γ1 and γ2) were received from the experimental measurements of the temperature-dependent saturated vapor pressure. Then we used the temperature and concentration dependent activity coefficients to calculate the excess thermodynamic functions of the solutions mixing (HE, GE, SE).

The saturated vapor pressure of ethacrylic acid solutions in acetonitrile and acetic acid was measured by a static tensimetric method in the temperature range of 295 to 355 K. The composition of the equilibrium phases as well as the activity coefficients were received from the experimental measurements of the temperature-dependent saturated vapor pressure. We then used the temperature and concentration dependent activity coefficients to calculate the excess thermodynamic functions of the solutions mixing (HE, GE, SE).