STATIC DIELECTRIC-CONSTANTS OF WATER + ETHANOL AND WATER + 2-METHYL-2-PROPANOL MIXTURES FROM 0.1 TO 300 MPA AT 298.15-K

The static dielectric constants e of water + ethanol and water + 2-methyl-2-propanol mixtures have been measured as a function of composition at 298.15 K and pressures up to 300 MPa. The measurements were carried out by means of a transformer ratio-arm bridge with a three-terminal dielectric cell placed In a pressure vessel for frequencies in the range 10-50 kHz. The uncertainty of the experimental ε values obtained was estimated to be within ±0.1%, and the reliability of the values was checked by comparison with available data in the literature. The results for ε as a function of pressure were well represented by the Talt-type equation. © 1990, American Chemical Society. All rights reserved.