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Concentration‐dependent molecular diffusion coefficient of gaseous ethane in liquid toluene
Author(s) -
Khalifi Mohammad,
Sabet Nasser,
Zirrahi Mohsen,
Hassanzadeh Hassan,
Abedi Jalal
Publication year - 2020
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.16966
Subject(s) - toluene , diffusion , mass transfer coefficient , chemistry , molecular diffusion , mass transfer , thermodynamics , effective diffusion coefficient , dissolution , flux (metallurgy) , mass flux , analytical chemistry (journal) , diffusion layer , grain boundary diffusion coefficient , mass diffusivity , chromatography , thermal diffusivity , organic chemistry , medicine , metric (unit) , physics , operations management , microstructure , radiology , electrode , magnetic resonance imaging , grain boundary , economics , crystallography
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.