Mutual diffusion coefficients of isopropanol + n-heptane and isobutanol + n-heptane

The mutual diffusion coefficients of isopropanol   +   n-heptane and isobutanol   +   n-heptane were measured at different concentrations and in the temperature range from (283.15 to 323.15)   K. The measurements were carried out using a digital holographic interferometry system. For all the mixtures investigated, the mutual diffusion coefficient increases as the temperature increases. At the same concentration and temperature, the mutual diffusion coefficients of isobutanol   +   n-heptane were lower than those of isopropanol   +   n-heptane due to the fact that the molecular weight of isobutanol is larger than that of isopropanol. A new correlation is proposed for the mutual diffusion coefficients of isopropanol   +   n-heptane and isobutanol   +   n-heptane. The absolute average relative deviation between the correlation and experiment is less than 1.90%.