Measurement and correlation of diffusion coefficients of vitamin K3 in a fluid mixture of carbon dioxide and decane at 313–343 K and 10–30 MPa

Abstract

The diffusion coefficients D1m of vitamin K3 in a dense fluid mixture of carbon dioxide and decane were measured by the Taylor dispersion method at temperatures from (313.2–343.2) K and pressures from (10−30) MPa, over the entire range of decane composition. The D1m values of vitamin K3 increased with increasing temperature and decreasing pressure under isocratic conditions. In addition, the measured D1m values were found to be correlated with the hydrodynamic (HD) equation based on the Stokes–Einstein equation, with an average relative deviation of 4.9% for 110 conditions over a wide range of fluid viscosities ranging from that of supercritical carbon dioxide to that of compressed liquid decane, apparently irrespective of the decane composition and solvent species.