JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Print ISSN : 0021-9592
Separations
Mass Transfer in Heterogeneous Distillation
Noritsuna SaitoHitoshi KosugeKoichi Asano
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1998 Volume 31 Issue 5 Pages 758-764

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Abstract

An experimental study on mass transfer in heterogeneous distillation was made with wetted-wall columns of different lengths for an ethanol-benzene-water system under total reflux conditions. The observed local diffusion fluxes obtained from the data of shorter distillation paths agree well with the theoretical values of mass transfer in a tube, but the average diffusion fluxes of longer distillation paths deviate from the theoretical ones.
Simulation of heterogeneous distillation with a wetted-wall column is carried out using the theoretical diffusion flux in a tube. The predicted concentrations and reflux flow rates at the top of the column showed good agreement with the observed data of longer distillation paths obtained by a longer column. The simulation results show that a large concentration driving force causes a longer distillation path and results in a large variation along the column. Also the deviation of the average diffusion flux from the theoretical value is demonstrated and explained by being made dimensionless with the average or non-local concentration driving force. Furthermore, the length of the distillation path is affected considerably by the bottom concentration and the vapor phase Reynolds number.

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© 1998 The Society of Chemical Engineers, Japan
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