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

•D12 of isopropanol + n-heptane and isobutanol + n-heptane were measured.•Effect of T, w and M of the solute on D12 were analyzed.•A new correlation is proposed for the experimental data.

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%.

Graphical abstractMutual diffusion coefficients of isopropanol + n-heptane as a function of mass fraction of isopropanol.Figure optionsDownload full-size imageDownload as PowerPoint slide