Static Relative Permittivities of Three Water + Butanediol Mixtures under Pressures up to 300 MPa at 298.15 K

Abstract

Static relative permittivities εr of water + butane-1,2-diol, water + butane-1,3-diol, and water + butane-1,4-diol in the liquid phase were determined from capacitance measurements over the entire composition range under pressures up to 300 MPa at 298.15 K. The Tait-type equation is applied to represent the pressure dependence of εr for each solution. The Tait-type parameters, A and B, are determined from the nonweighted least-squares method. The composition dependence of εr(0.1), (∂ ln εr/∂P) T , and εr -2(∂εr/∂P) T values at 0.1 MPa for the three binary aqueous butanediol mixtures are compared.

Static Relative Permittivities of Water + Ethane-1,2-diol and Water + Propane-1,2,3-triol under Pressures up to 300 MPa at 298.15 K

“…Recently we have reported ε r values for pure polyhydric alcohols, three aqueous butanediol mixtures, and two aqueous propanediol mixtures 5 under pressures up to 300 MPa at 298.15 K. The present paper reports ε r for water + ethane-1,2-diol and water + propane-1,2,3-triol at the mole fraction of polyhydric alcohol x 2 from 0 to 0.8 at intervals of 0.2 under pressures up to 300 MPa at 298.15 K. Relative permittivity at P = 0.1 MPa ε r ( P 0 ) for both aqueous mixtures are fitted to a polynomial equation of x 2 . Pressure and density dependence of ε r are, respectively, correlated with a Tait-type equation and a quadratic equation of density.…”

“…The static relative permittivities ε r of water + polar organic mixtures under high pressures up to 300 MPa at 298.15 K have so far been measured as a function of composition in our laboratory. − Furthermore, compressions of binary aqueous polar organic mixtures at various compositions have been measured under pressures up to 200 MPa at 298.15 K, and composition dependence of the isothermal compressibilites at 0.1 MPa determined from their compression data has been reported …”

“…The static relative permittivities r of water + polar organic mixtures under high pressures up to 300 MPa at 298.15 K have so far been measured as a function of composition in our laboratory. [1][2][3][4][5] Furthermore, compressions of binary aqueous polar organic mixtures at various compositions have been measured under pressures up to 200 MPa at 298.15 K, and composition dependence of the isothermal compressibilites at 0.1 MPa determined from their compression data has been reported. 6 Recently we have reported r values for pure polyhydric alcohols, 7 three aqueous butanediol mixtures, 4 and two aqueous propanediol mixtures 5 under pressures up to 300 MPa at 298.15 K. The present paper reports r for water + ethane-1,2-diol and water + propane-1,2,3-triol at the mole fraction of polyhydric alcohol x 2 from 0 to 0.8 at intervals of 0.2 under pressures up to 300 MPa at 298.15 K. Relative permittivity at P ) 0.1 MPa r (P 0 ) for both aqueous mixtures are fitted to a polynomial equation of x 2 .…”

Static Relative Permittivities of Water + Propane-1,2-diol and Water + Propane-1,3-diol under Pressures up to 300 MPa at 298.15 K

“…Our r (0.1 MPa) data as a function of x 2 for each system are represented by the following equation: Values of the coefficients A i for each system obtained by the method of nonweighted least-squares are given in Table 2, along with the standard deviation of the fit σ( r (0.1 MPa)). A marked decrease in r (0.1 MPa) is observed at lower x 2 in aqueous propanediol as well as in other aqueous organic mixtures so far studied in our laboratory 1,2,4 except in water + dimethyl sulfoxide. 3 The literature r (0.1 MPa) values for water + propane-1,2-diol by Verbeeck et al Figure 2 shows the experimental r results for both water + propanediol systems as a function of pressure.…”

“…We have so far reported r results for some aqueous organic mixtures at selected mole fractions under high pressures up to 300 MPa at 298.15 K and examined composition dependence of (∂ ln r /∂P) T and (∂ r /∂P) T values at 0.1 MPa for each aqueous organic mixture. [1][2][3][4] To extend our understanding of dielectric properties for water + organic solvents, this paper reports r results of water + propane-1,2-diol and water + propane-1,3-diol at selected mole fractions under pressures up to 300 MPa at 298.15 K. Since the isothermal compressibilities (κ T ) for both aqueous propanediol systems were determined previously as a function of composition at 0.1 MPa and 298.15 K, 5 the composition dependence of (∂ ln r /∂P) T and κ T at 0.1 MPa is compared for both water + propanediol mixtures. A relationship between (∂ ln r /∂P) T and κ T at 0.1 MPa is derived, and the condition that those values are approximately equal each other is described.…”