caa a22 4500 465755534 CHVBK 20180323111846.0 cr unu---uuuuu 170327e19900501xx s 000 0 eng 10.1007/BF00500845 doi (NATIONALLICENCE)springer-10.1007/BF00500845 Composition dependence of binary diffusion coefficients in alkane mixtures [Elektronische Daten] [S. Li, L. Yue] The binary diffusion coefficients of mixtures of n-heptane with n-hexane and 2,2,4-trimethylpentane with n-hexane have been measured at various compositions at 308.1, 312.2, and 316.5 K using the Taylor dispersion technique. The experimental results for the n-hexane/n-heptane system were in good agreement with the literature values (<1.5%). The observed binary diffusion coefficients for this system exhibit a linear dependence on composition. On the contrary, the results of the n-hexane/2,2,4-trimethylpentane system reveal an interesting behavior of the composition dependence of the binary diffusion coefficients, presenting a slight maximum, for composition at a molar fraction of n-hexane of 0.86. In order to explain this difference in behavior, the influence of branching of molecules on diffusion is discussed. It was found that although the Enskog hard-sphere model for binary diffusion can reproduce the experimental results for the n-hexane/n-heptane system within 3%, it failed to predict the composition dependence of the n-hexane/2,2,4-trimethylpentane system within the experimental accuracy. The results showed that there is significant effect of branching in alkane molecules on the diffusion coefficient. This effect has been quantified using the roughness parameter, which represents the magnitude of coupling between translational and rotational motions. Plenum Publishing Corporation, 1990 composition dependence nationallicence diffusion coefficient nationallicence n -heptane nationallicence n -hexane nationallicence mixtures nationallicence 2,2,4-trimethylpentane nationallicence Li S. Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, 0511, Singapore, Republic of Singapore aut Yue L. Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, 0511, Singapore, Republic of Singapore aut International Journal of Thermophysics Kluwer Academic Publishers-Plenum Publishers 11/3(1990-05-01), 537-554 0195-928X 11:3<537 1990 11 10765 https://doi.org/10.1007/BF00500845 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00500845 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li S. Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, 0511, Singapore, Republic of Singapore aut NATIONALLICENCE 700 1- Yue L. Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, 0511, Singapore, Republic of Singapore aut NATIONALLICENCE 773 0- International Journal of Thermophysics Kluwer Academic Publishers-Plenum Publishers 11/3(1990-05-01), 537-554 0195-928X 11:3<537 1990 11 10765 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer