A comprehensive kinetic and thermodynamic study of CO2 absorption in blends of monoethanolamine and potassium lysinate: Experimental and modeling

Rouzbeh Ramezani, Saeed Mazinani, Renzo Di Felice

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this work, a kinetic and thermodynamic study of CO2 absorption in blends of monoethanolamine (MEA) and potassium lysinate (K-Lys) solutions was carried out at low CO2 partial pressures and temperatures (303–323 K). The CO2 loading capacity, density and viscosity of MEA + K-Lys solutions were measured. A modified Kent-Eisenberg model was applied to predict the CO2 loading capacity and also to determine the reaction equilibrium constants for the MEA + K-Lys system. The results showed that the model predictions are in excellent agreement with the experimental data. In order to study the reaction kinetics between CO2 and the MEA + K-Lys solution, the values of the reaction rate constant, the overall reaction kinetic constant, reaction order, physical solubility and CO2 diffusivity were determined. Finally, the absorption performance of the MEA + K-Lys system was compared with other common CO2 absorbents in terms of absorption heat, CO2 loading capacity and absorption rate. It was found that MEA + K-Lys has a better performance compared to other absorbents which makes it an attractive alternative to alkanolamines for CO2 capture.

Original languageEnglish
Pages (from-to)187-202
Number of pages16
JournalChemical Engineering Science
Volume206
DOIs
Publication statusPublished - Oct 12 2019

Keywords

  • Amino acid
  • CO capture
  • Kent-Eisenberg
  • Kinetic study
  • Thermodynamic modeling

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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