Adsorption fixed beds modeling revisited: Generalized solutions for S-shaped isotherms

V. J. Inglezakis, M. M. Fyrillas

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Adsorption fixed bed models are of paramount importance in chemical and environmental engineering research. Although the related literature is rich, the vast majority of models employed are either phenomenological, based on chemical reaction kinetics, or limited to systems that obey simple equilibrium isotherms (favorable, unfavorable, linear, and rectangular) combined to linear driving force (LDF) for the solid-phase mass transfer kinetics and ideal plug flow. This paper complements the existing studies by presenting and analyzing a versatile nondimensional fixed bed model equipped with diffusion-based mass transfer kinetics and nonideal flow terms and adapted to deal with S-shaped (sigmoidal) isotherms. A discussion is conducted on the rather unusual fixed bed dynamics produced by systems that follow S-shaped isotherms, a subject which has been rarely and nonsystematically discussed in the related literature. Thus, this study aims at providing better understanding of the interactions of S-shaped isotherms, mass transfer, and axial dispersion on the shape of adsorption fixed bed breakthrough curves and comes to clarify and complement previously published results, especially on the unexplored effects of the isotherms’ inflection point on the breakthrough curves.

Original languageEnglish
Pages (from-to)1-19
Number of pages19
JournalChemical Engineering Communications
DOIs
Publication statusAccepted/In press - Sep 21 2017

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Isotherms
Adsorption
Mass transfer
Environmental engineering
Kinetics
Engineering research
Chemical engineering
Reaction kinetics
Chemical reactions

Keywords

  • Adsorption
  • fixed bed modeling
  • ion exchange
  • S-shaped isotherms

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Adsorption fixed beds modeling revisited : Generalized solutions for S-shaped isotherms. / Inglezakis, V. J.; Fyrillas, M. M.

In: Chemical Engineering Communications, 21.09.2017, p. 1-19.

Research output: Contribution to journalArticle

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