Dynamics of CO2Absorption and DesorptionProcesses in Alkanolamine with Cosolvent Polyethylene Glycol.

To reduce the high energy consumption and equipment corrosioninconventional processes of CO2capture with aqueous aminesolutions, the mixed nonaqueous solvents of monoethanolamine (MEA),diethanolamine (DEA), and diglycolamine (DGA) with polyethylene glycol(PEG) as cosolvent were explored for CO2capture. The dynamicexperiments of CO2absorption and desorption were carriedout to evaluate the performance of the studied nonaqueous solutions.It demonstrated that the mixed solutions of amines and PEG exhibitedhigher CO2cyclic capacity and regeneration efficiencycompared with the only aqueous amine solutions. Especially, the solutionof 3 mol/L DGA-PEG200 exhibits a high cyclic capacity of 0.438 molCO2/mol DGA and a high regeneration efficiency of 94.6%,which indicates its great potential in industrial application. Moreover,the very low vapor pressure of PEG helps the mixed solution for CO2capture with reduced corrosion, energy consumption, and environmentalpollution. [ABSTRACT FROM AUTHOR]