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Evaluating CO2 Capture in Aqueous Amine Solution by Using a New Microbubble System.

Rafael Garcia Candido1, Thiago Galeote Tabuti1, Leandro Gonçalves de Aguiar1

  • 1Engineering School of Lorena, Chemistry Department, São Paulo University, Lorena, São Paulo 12602-810, Brazil.

ACS Omega
|June 15, 2026
PubMed
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A novel microbubble system significantly enhances carbon dioxide (CO2) capture using amine solutions like monoethanolamine (MEA). This method improves efficiency and speed, offering a promising solution for industrial CO2 capture.

Area of Science:

  • Chemical Engineering
  • Environmental Science
  • Materials Science

Background:

  • Carbon capture technologies are crucial for mitigating climate change.
  • Aqueous amine solutions are widely studied for CO2 absorption.
  • Optimizing CO2 capture efficiency and reaction kinetics remains a key challenge.

Purpose of the Study:

  • To evaluate and compare two CO2 capture systems: CO2 jets versus microbubbles.
  • To assess the performance of monoethanolamine (MEA) and triethanolamine (TEA) in these systems.
  • To investigate the role of water in enhancing CO2 absorption with amine solutions.

Main Methods:

  • Experimental evaluation of CO2 capture efficiency using mass variation measurements.
  • Comparison of CO2 jet and microbubble systems with MEA and TEA solvents.

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  • Mathematical modeling to determine reaction kinetics and mass transfer constants.
  • Application of the Conductor-like screening model for real solvents (COSMO-RS) for thermodynamic property prediction.

    • Main Results:

    • The CO2 jet system showed limited CO2 capture efficiency.
    • The microbubble system demonstrated high efficiency, with MEA surpassing stoichiometric values and TEA reaching its theoretical limit.
    • An optimal amine-to-water ratio was identified, enhancing CO2 absorption.
    • Mathematical modeling and COSMO-RS predictions validated experimental findings.

    Conclusions:

    • The microbubble system represents a significant advancement in CO2 capture technology.
    • This system offers improved efficiency, reduced reaction times, and enhanced mass transfer.
    • It presents a promising and potentially scalable alternative for industrial carbon capture applications.