Static relative permittivities of water + propane-1,2-diol and water + propane-1,3-diol were measured at four mole fractions under pressures up to 300 MPa at 298.15 K. A Tait-type equation was used to represent er with pressure (P) for each composition. Values of (@ ln er/@P)T and er -2(@er/@P)T at 0.1 MPa for both aqueous propanediol systems were determined by use of the static relative permittivity at 0.1 MPa, er(0.1 MPa), and the Tait-type parameters, A and B. Values of (@ ln er/@P)T and the isothermal compressibility (eT) at 0.1 MPa over the entire composition range are compared for both aqueous propanediol systems. A relationship between (@ ln er/@P)T and eT at 0.1 MPa was derived from the density dependence of er. Furthermore, composition dependence of er at 0.1 MPa was examined for the present systems.
Compounds
#
Formula
Name
1
C3H8O2
1,2-propanediol
2
C3H8O2
propan-1,3-diol
3
H2O
water
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
3
Relative permittivity at zero frequency ; Liquid
Pressure, kPa; Liquid
Mole fraction - 1; Liquid
Temperature, K; Liquid
Liquid
transformer ratio-arm bridge with a 3-terminal dielectric cell
28
POMD
2
3
Relative permittivity at zero frequency ; Liquid
Pressure, kPa; Liquid
Mole fraction - 2; Liquid
Temperature, K; Liquid
Liquid
transformer ratio-arm bridge with a 3-terminal dielectric cell