Predicting solvent effects on relative volatility behavior in extractive distillation using isothermal titration calorimetry (ITC) and molecular modeling (MM)

Lisette M.J. Sprakel, Dylan J. Keijsper, Anna L. Nikolova, Boelo Schuur*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A solvent screening approach for extractive distillation, combining isothermal titration calorimetry (ITC) and molecular modeling (MM), was investigated based on three close-boiling mixture cases. The investigated mixtures are octanoic acid (HOct) and levulinic acid (HLev); diethylmethylamine (DEMA) and diisopropylether (DIPE); 2-butanol (2-BuOH) and 2-butanone (2-BuO). Solvent effects were predicted based on ITC and MM. The correlation between the interaction energy of the solvent and mixture constituents and the effect on the relative volatility (validated with VLE experiments) was shown. Successful solvents showed moderate interactions (between binary mixture interaction energy and −60 kJ/mol, with MM calculated). Too low interaction energy lacks effect and too high interaction energy compromised regeneration. For mixtures without strong intermolecular interactions (e.g. 2-BuOH and 2-BuO), a preferential exothermic interaction with the high-boiling component is needed. The developed method with solvent selection guidelines offers an effective approach for systems with strong non-idealities.

Original languageEnglish
Article number115203
JournalChemical engineering science
Volume210
Early online date4 Sep 2019
DOIs
Publication statusPublished - 31 Dec 2019

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Keywords

  • Extractive distillation
  • Isothermal titration calorimetry (ITC)
  • Molecular modeling (MM)
  • Solvent regeneration
  • Solvent screening

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