Diffusion coefficients of linoleic acid methyl ester, Vitamin K3 and indole in mixtures of carbon dioxide and n-hexane at 313.2 K, and 16.0 MPa and 25.0 MPa

Abstract

Diffusion coefficients of linoleic acid methyl ester, Vitamin K3 and indole in mixtures of carbon dioxide and n-hexane were measured at 313.2 K, and 16.0 and 25.0 MPa by using the Taylor dispersion method. It was found that the measured diffusion coefficients D1m were well correlated by the Blanc's equation:D1m=1x2/D12+x3/D13where x2 and x3 are mole fractions of CO2 and n-hexane, and D12 and D13 are binary diffusion coefficients of the solutes in CO2 and n-hexane, respectively, measured at the same temperature and pressure. Other equations for D1m, as a function of temperature and solvent viscosity, were tested as a possible correlating equation.