Measurement and modelling of surface tensions of systems containing n-hexadecane, n-heptane and n-pentane

摘要

The surface tension of (n-hexadecane+n-heptane), (n-hexadecane+n-pentane) and (n-hexadecane+n-heptane+n-pentane) mixtures were measured at 91.3 kPa and the 293.15-323.15K temperature range by the maximum bubble pressure method. The surface tension of pure n-hexadecane was measured at 91.3 kPa and the 303.15-343.15K temperature range. The measured surface tension data of pure n-hexadecane was correlated by SPTM3 model, which was obtained from coupling scaled particle theory (SPT) and MMM equation of state. For the extension of the SPTM3 model to mixture calculations, the commonly used mixing rules for the cubic equations of state were applied. The comparisons between the obtained surface tension data and those calculated by the SPTM3 model indicate that the data can be described with deviations less than 1.56%. Therefore, the SPTM3 model is applicable for surface tension calculations of the studied mixtures.