Mass transfer performance in an Oldshue–Rushton column extractor

•The mass transfer performance is investigated in an Oldshue–Rushton column.•The operating variables were evaluated and found to be significant.•Mass transfer coefficients are illustrated in terms of the axial diffusion model.•An empirical correlation is derived for prediction of overall mass transf...

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Bibliographic Details
Published in:Chemical engineering research & design 2015-08, Vol.100, p.104-112
Main Authors: Asadollahzadeh, M., Shahhosseini, Sh, Torab-Mostaedi, M., Ghaemi, A.
Format: Article
Language:English
Subjects:
Axial diffusion model
Chemical engineering
Chemical engineers
Correlation
Design engineering
Dispersion
Enhancement factor
Mass transfer
Mass transfer coefficient
Mathematical models
Oldshue–Rushton extractor
Rotor speed
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Summary:•The mass transfer performance is investigated in an Oldshue–Rushton column.•The operating variables were evaluated and found to be significant.•Mass transfer coefficients are illustrated in terms of the axial diffusion model.•An empirical correlation is derived for prediction of overall mass transfer coefficient.•This correlation can be used to calculate the column height for different processes. The volumetric overall mass transfer coefficients of an Oldshue–Rushton column have been measured using an axial diffusion model, applying two different liquid–liquid systems. The effects of the operating parameters such as rotor speed and dispersed and continuous phase velocities on the volumetric overall mass transfer coefficients have been investigated. The rotor speed was found to have a more profound effect on the column performance. The phase flow rates had little influence on the mass transfer performance. The previous models for estimation of the overall mass transfer coefficient were reviewed and their predictions were compared with the experimental data. All of the previous models failed to properly predict the experimental results under the operating conditions. Therefore, an empirical correlation was proposed for enhancement factor as a function of Re number, Eö number and dispersed phase holdup. This correlation relatively accurately predicted the mass transfer coefficients, so it could be applied to design the Oldshue–Rushton columns.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2015.04.027