Influence of liquid back mixing on a kinetically controlled reactive distillation process

Mayank Shah*, Anton A. Kiss, Edwin Zondervan, Andre B. de Haan

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

Abstract

The state of the art equilibrium model and the rate-based models for reactive distillation (RD) are very well known and have been used since a couple of decades. However, these models are not sufficient to accurately represent a slow reaction process that is kinetically controlled. The shortcoming is due to neglecting the effect of liquid back mixing (LBM) on the whole process. This work presents a review of the available modeling approaches for RD, then discusses the applicability of various models and finally, it applies the findings to an industrially relevant case study-polyester synthesis. The main focus is on extending the dynamic rate-based model to take into account the liquid back mixing. We also show how the axial dispersion can be introduced into the RD model, without adopting the axial dispersion model. The comparison of the results of the rate-based model, with and without axial dispersion, clearly demonstrates that the extended model predicts more accurately the kinetically controlled process as compared to the conventional rate-based model.

Original languageEnglish
Pages (from-to)184-191
Number of pages8
JournalChemical engineering science
Volume68
Issue number1
DOIs
Publication statusPublished - 22 Jan 2012
Externally publishedYes

Keywords

  • Aspen Custom Modeler
  • Axial dispersion
  • Liquid back mixing
  • Polyester
  • Product changeover
  • Reactive distillation modeling

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