Modeling, simulation and control of liquid-liquid extraction columns

O. Weinstein, R. Semiat, D. R. Lewin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


A model describing the hydrodynamics and mass transfer of countercurrent liquid-liquid extraction columns s developed and solved. The hydrodynamic model assumes that the dispersed-phase drops behave as spheres of uniform diameter. The model has been found to be qualitatively in agreement with experimental results published in the literature. It is shown that conventional dispersion interface level control using the continuous-phase effluent flow rate as the manipulated variable causes unavoidable overshoots and oscillations in the mean holdup and outlet concentrations, while an alternative scheme using the continuous-phase feed flow rate leads to a significant improvement in the dynamic response. A model-based decentralized MIMO control scheme is designed and tested by simulation, and is shown to provide excellent servo and regulatory performance.

Original languageEnglish
Pages (from-to)325-339
Number of pages15
JournalChemical Engineering Science
Issue number2
StatePublished - Jan 1998
Externally publishedYes


  • Dynamic simulation and control
  • Liquid-liquid extraction column
  • Mathematical models


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