REGENERATION OF MONOETHANOLAMINE-BASED SORBENTS OF CARBON DIOXIDE BY ELECTRODIALYSIS WITH BIPOLAR MEMBRANES.

With the aim of diminishing electroosmotic transport of MEA and displacement of the carbon dioxide equilibrium toward evolution of CO//2, the authors have studied regeneration of aqueous MEA sorbents in an electrodialyzer with alternating bipolar and anion-exchange membranes. The authors investigations show that electrodialysis with alternating bipolar and anion-exchange membranes can be used for low-temperature regeneration of MEA-based sorbents in gas purification systems not intended for a high degree of CO//2 removal from gases, when complete decarbonization of the sorbent is not needed. Independent use of this type of electrodialyzer in systems for a high degree of CO//2 removal is restricted by mass transfer through anion-exchange membranes in weakly carbonated MEA solutions.