STATIC RELATIVE PERMITTIVITIES OF WATER-PLUS-ACETONE AND WATER-PLUS-DIMETHYL-SULFOXIDE UNDER PRESSURES UP TO 300-MPA AT 298.15-K

Liquid phase static relative permittivities epsilon(r) of water + acet one and water + dimethyl sulfoxide have been measured over the whole m ole-fraction range under pressures up to 300 MPa at 298.15 K. The pres sure P dependence of epsilon(r) values for each mixture was well fitte d to the Tait-type equation, and the Tait-type parameters, A and B, we re determined. For each aqueous mixture, the composition dependence of (partial derivative ln epsilon(r)/partial derivative P)(T) values at 0.1 MPa evaluated from the static relative permittivity at 0.1 MPa, ep silon(r)(0.1), and the Tait-type parameters was compared with that of the isothermal compressibility kappa(T) at 0.1 MPa. Values of epsilon( r)(-2)(partial derivative epsilon(r)/partial derivative P)(T) at 0.1 M Pa as a function of composition were also compared for both aqueous mi xtures. For pure acetone, (partial derivative ln epsilon(r)/partial de rivative P)(T) and epsilon(r)(-2)(partial derivative epsilon(r)/partia l derivative P)(T) values at 0.1 MPa were correlated with temperature by a combination of the present values and the ones evaluated from the literature epsilon(r) data.