Viscosity and density of ternary mixtures of di-(2-ethylhexyl)phosphoric acid (DEHPA)-benzene-toluene

Abstract

Viscosities and densities of the ternary liquid mixtures of di (2-ethylhexyl) phosphoric acid + benzene + toluene have been measured at 30, 35, 40 and 45°C. The mixture viscosity, η_m is fitted to a Redlich-Kister-type equation which includes the contribution of each constituent binary system along with a ternary contribution term. The non-idealities reflected in mixture viscosities are expressed and discussed in terms of excess viscosities which are negative over the entire range of mole fraction. Negative values of excess viscosity, η^E, and the nonlinear variation of viscosity and density with change of composition indicate molecular interaction between the polar extractant and non-polar diluents.