Evaluation of Dielectric Constant for Binary Solutions Using Wilson-DIELECT Model

The excess dielectric constant was proposed as ( ln ε0)E= ln ε−x1 ln ε1−x2 ln ε2. The value of −( ln ε0)E was adopted with an equation similar to the Wilson activity coefficient model (Wilson-DIELECT model). The interaction energies were fitted with the reported dielectric constant data for benzene – toluene, bromobenzene – chlorobenzene at 293 K, bromobenzene – methanol and nitrobenzene – 1-propanol at 298 K, and methanol – water and ethanol -water at (293-333) K. The AARDs for ε0 were obtained to be 0.29%, 0.47%, 2.51%, 0.95%, 0.20% and 0.50%, respectively. The evaluation was also carried out by using the reported dielectric constant data for ethanol - dimethyl ether, pressurize with 1.00 MPa at (293-313) K. The pressure and temperature dependences were assumed only in liquid molar volume for pure constituents, and the temperature dependence was set in the energy parameters in the Wilson-DIELECT model. The AARD was 0.81% for ε0.