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Mixed solvents of monoethanolamine(MEA), diglycolamine (DGA),diethanolamine (DEA), and N-methyldiethanolamine(MDEA) with poly(ethylene glycol) 200 (PEG200) as cosolvent were analyzedby thermal gravimetric analysis to select an available CO2absorber. MEA-PEG200 has the lowest onset temperature (the temperatureat which the weight loss begins) of 363 K and thus is not appropriatefor CO2capture at high temperature. The viscosities ofthe mixtures decrease as temperature increases, and are mainly decidedby the viscosity of PEG200 at a high temperature. The solubility ofCO2in mixed solvents of alkanolamine (DGA, DEA, and MDEA)and PEG200 was measured over the range of pressure from (10 to 1600)kPa and temperature from (313.15 to 393.15) K in intervals of 40 K.DEA and DGA solutions show relatively high CO2capacityat 313.15 K owing to a chemical reaction with CO2, whileMDEA solution presents the property of physical absorber. When temperaturefurther increases to 393 K, the capacity decreases significantly.The solubility was correlated by Jou and Mather’s model. [ABSTRACT FROM AUTHOR]

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]