Low Energy CO₂ Capture by Electrodialysis

Liquid amine scrubbing has been widely and intensively investigated at demonstration scale to capture CO₂ at mass CO₂ emission sources, such as thermal power plants and steelworks. However, CO₂ regeneration process in a desorber is energy intensive, which limits implementation of this capture technology. Herein we propose an alternative CO₂ capture method by electrodialysis. CO₂ in a flue gas or blast furnace is trapped in aqueous K₂CO₃, and the resulting solution is condensed by electrodialysis. The trapped CO₂ is finally recovered under vacuum. This technique can significantly reduce the required energy to capture CO₂ in comparison to the current technology. Published by Elsevier Ltd.