Concentration-dependent molecular diffusion coefficient of gaseous ethane in liquid toluene |
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| Authors: | Mohammad Khalifi Nasser Sabet Mohsen Zirrahi Hassan Hassanzadeh Jalal Abedi |
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| Affiliation: | Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada |
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| Abstract: | We report new experimental data on concentration-dependent molecular diffusion coefficient of ethane in toluene at temperatures ranging from 21 to 125°C and pressures up to 4.14 MPa. An analytical model has also been developed for estimation of the diffusion coefficient utilizing the experimental data of the interface velocity as a result of swelling and the rate of gas dissolution in the liquid phase. It is shown that the diffusion coefficient of ethane in toluene is dependent on the initial mass fraction of the gaseous component in the liquid. In addition, the effect of concentration dependency of the molecular diffusion coefficient on diffusive mass flux is quantified. The results reveal that the assumption of a constant diffusion coefficient introduces ~10–60% error in calculation of diffusional mass transfer flux. The developed methodology finds application in estimation of the concentration-dependent molecular diffusion coefficient of gases in liquids. |
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| Keywords: | concentration-dependent diffusion ethane and toluene mixture molecular diffusion coefficient |
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