Handling heat‐stable salts in post‐combustion CO2 capture: A detailed survey

Wilfred Emori*, Inime I. Udoh, Okpo O. Ekerenam, Alexander I. Ikeuba, IniIbehe N. Etim, Chigoziri N. Njoku, Enobong F. Daniel*, Demian I. Njoku*, Paul C. Uzoma, Sharafadeen K. Kolawole*, Olajire S. Olanrele

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The generation of heat‐stable salts (HSSs) in alkanolamine solutions for CO2 capture processes, which is adapted for power plant technologies, exists irrespective of the class of amine solution used for the capture process. Their presence do not only trigger decrements in the CO2 absorption capacities of the solvents and contribute to further alkanolamine degradation, but also result in foaming and loss of solvents, which impacts system economics and threatens the environment. HSSs also promote the corrosiveness of the metallic structures of capture systems by lowering the pH and increasing the conductivity of the absorbent solutions. Overall, these effects substantially subvert the reliability and integrity of CO2 capture units. This survey affords sufficient background on the existence of HSSs by unraveling the flow process in a typical alkanolamine‐based CO2 capture unit with respect to their formation points and potential threats. Furthermore, the major HSSs removal and alkanolamine reclamation methodologies (electrodialysis, distillation, ion exchange, electromagnetic separation, and solvent extraction) were comprehensively explored. We believe that this review paper will benefit researchers across disciplines as we continue to explore new and complex solvent formulations to minimize the cost of CO2 capture while maximizing efficiency
Original languageEnglish
JournalGreenhouse Gases: Science and Technology
Volume13
Issue number6
Pages (from-to)876-904
ISSN2152-3878
DOIs
Publication statusPublished - 2023

Keywords

  • Distillation
  • Electrodialysis
  • Heat-stable salt
  • Ion exchange
  • Post-combustion capture
  • Reclamation

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