Handling heat‐stable salts in post‐combustion CO<sub>2</sub> capture: A detailed survey
Wilfred Emori, Inime Ime Udoh, Okpo O. Ekerenam, Alexander I. Ikeuba, Ini‐Ibehe Nabuk Etim, Chigoziri N. Njoku, Enobong Felix Daniel, Demian I. Njoku, Paul C. Uzoma, Sharafadeen Kunle Kolawole, Olajire S. Olanrele
Abstract
Abstract The generation of heat‐stable salts (HSSs) in alkanolamine solutions for CO 2 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 CO 2 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 CO 2 capture units. This survey affords sufficient background on the existence of HSSs by unraveling the flow process in a typical alkanolamine‐based CO 2 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 CO 2 capture while maximizing efficiency. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.