The theoretical study of effect of temperature on the physicochemical parameters for binary mixtures of vinyl acetate and benzyl acetate, + o-xylene, + m-xylene and + p-xylene

In this work we used the Flory theory of liquid mixtures for determining the thermal parameters such as excess thermal expansion coefficients αE  , and isothermal coefficient of pressure excess molar enthalpy (∂HmE/∂P)T,x, of the binary mixtures formed by vinyl acetate and benzyl acetate + o-xylene, or m-xylene, or p-xylene at (303.15 and 313.15) K. From these data the acoustical parameters such as available volume (Va), isothermal (K/), isobaric (K), and isochoric acoustical parameters (K//), isochoric temperature coefficient of the internal pressure (X), and Moelwyn-Hughes parameter (C1), have been calculated. The excess thermal expansion coefficient αE, for the binary mixtures of benzyl acetate + o-xylene and vinyl acetate + m-xylene are negative in x = 0.2434 and x = 0.9602, respectively, and positive for all mole fractions and increase with increasing temperatures from (303.15 and 313.15) K. The isothermal coefficient of pressure excess molar enthalpy, (∂HmE/∂P)T,x, for vinyl acetate + o-xylene, + p-xylene and benzyl acetate + m-xylene,+ p-xylene are negative and decrease with increasing temperatures from (303.15 and 313.15) K. The isothermal coefficient of pressure excess molar enthalpy, (∂HmE/∂P)T,x, for a binary mixture of benzyl acetate + o-xylene is positive and increases with increasing temperatures from (303.15 and 313.15) K.