A Thiele Modulus Approach for Nonequilibrium Adsorption Processes and Its Application to CO2 Capture

Rick T. Driessen*, Sascha R.A. Kersten, Derk W.F. Brilman*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
5 Downloads (Pure)

Abstract

A Thiele modulus-effectiveness factor method was applied to provide insight into the interplay of intraparticle mass transfer and intrinsic adsorption kinetics in nonequilibrium adsorption processes. A full model and two approximate methods were considered. In the approximate methods only the fluid concentration at the exterior surface and the averaged sorbent loading are required as input. Assuming a uniform sorbent loading, an explicit solution for the effectiveness factor for adsorption as a function of the Thiele modulus for adsorption was derived. For each adsorptive system a minimum and maximum Thiele modulus can be calculated, which provide a priori insights regarding the rate-determining step. The approximations were validated against complete numerical solutions for a single particle and their use was compared to a complete particle description within a full reactor-particle model. Results for CO2 adsorption from flue gas and ambient air showed that the approximations result in a good accuracy for the applications studied.

Original languageEnglish
Pages (from-to)6874-6885
Number of pages12
JournalIndustrial and engineering chemistry research
Volume59
Issue number15
DOIs
Publication statusPublished - 15 Apr 2020

Keywords

  • UT-Hybrid-D

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