Integration of graphical approaches into optimization-based design of multistage liquid extraction

Garry S.P. Taifan, Christos T. Maravelias

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We propose two optimization models for designing two liquid extraction systems: simple multistage liquid extractors and extractors with extract reflux. Both models are motivated by the concepts of the modified McCabe-Thiele graphical method for multistage extractor design. The operating and equilibrium curves in the McCabe-Thiele method are represented by material balances and piece-wise linearized thermodynamics properties. The use of piece-wise approximations improves computational tractability of both optimization models. In addition, we consider some extensions such as dilute systems, insoluble solvents, and non-ideal stages. The applicability of the proposed models is demonstrated with four illustrative examples.

Original languageEnglish (US)
Article number107126
JournalComputers and Chemical Engineering
StatePublished - Dec 5 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Computer Science Applications


  • Mixed integer nonlinear programing
  • Process optimization
  • Process synthesis
  • Separations


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