Static relative permittivities of water plus 1-methyl-2-pyrrolidinone and water plus 1,3-dimethyl-2-imidazolidinone mixtures under pressures up to 300 MPa at 298.15 K

Static relative permittivities Er Of water + 1-methyl-2-pyrrolidinone and water + 1,3-dimethyl-2-imidazolidinone mixtures have been measured over the whole mole-fraction range under pressures up to 300 MPa at 298.15 K. The experimental results as a function of pressure P for each mixture were fitted to the Tait-type equation, and the Tait-type parameters, A and B, were determined. Values of (partial derivative In epsilon(r)/partial derivative P)(T) and epsilon(r)(-2) (partial derivative epsilon(r)/partial derivative P)(T) at 0.1 MPa for both binary aqueous mixtures were evaluated from the static relative permittivity at 0.1 MPa, epsilon(r)(0.1), and the Tait-type parameters and compared with each other. For the water + 1-methyl-2-pyrrolidinone mixture, values of (partial derivative In epsilon(r)/partial derivative P)(T) and the isothermal compressibility kappa(T) at 0.1 MPa as a function of composition were also compared.