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Diffusion coefficients for binary alkane mixtures to 573 K and 3.5 MPa
Author(s) -
Matthews M. A.,
Akgerman Aydin
Publication year - 1987
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690330602
Subject(s) - alkane , dodecane , thermodynamics , tetradecane , decane , chemistry , taylor dispersion , dilution , diffusion , heptane , octane , viscosity , binary number , volume (thermodynamics) , analytical chemistry (journal) , chromatography , organic chemistry , physics , mathematics , hydrocarbon , arithmetic
An automated Taylor dispersion apparatus, designed to operate from 298 to 573 K and 101 to 3,450 kPa (14.7 to 500 psia), was used to measure diffusion coefficients at infinite dilution for the solutes n ‐octane, n ‐decane, n ‐dodecane, n ‐tetradecane, and n ‐hexadecane in the solvents n ‐heptane and n ‐dodecane. Dodecane viscosity and density also were measured at all conditions. Various predictive theories are tested in light of the new data, and a correlation based on the data at high temperature and pressure is presented. The data are well represented by a free‐volume expression of the form \documentclass{article}\pagestyle{empty}\begin{document}$ D_{AB} /\sqrt T = \beta \,(V - V_D) $\end{document} . The data given here extend the available data base for alkane/alkane diffusion by 100 to 200 K, and allow evaluation of predictive theory over an extended range of temperatures.