DIELECTRIC STUDIES ON BINARY-MIXTURES OF TRI-N-BUTYL PHOSPHATE (TBP) AND LONG-CHAIN PRIMARY ALCOHOLS (MODIFIERS)

Dielectric constant (epsilon) of Tri-n-butyl phosphate (TBP), in binary mixtures with five long-chain primary alcohols viz; 1-butanol, 1-hexanol, 1-hexanol, 1-heptanol and 1-octanol has been measured at nu=455 kHz and at temperature 302 K. The data is used to evaluate mutual correlation factor g(ab), excess molar polarization DELTAP and excess free energy of mixing DELTAF(ab) by using Winkelmann-Quitzsch eqn. for binary mixtures to assess the suitability of the alcohols as modifiers. The trend of variation of these parameters exhibit marked dependence on chain-length of the alcohols indicating 1-heptanol to be an efficient modifier.