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In this study,the CO2 absorption characteristics of two tertiary amines were studied using 1H nuclear magnetic resonance(NMR)and quantitative 13C NMR.The equilibrium experiments were conducted in the vapor-liquid equilibrium(VLE)apparatus,which was used to measure the CO2 absorption capacities of aqueous solutions of N-methyldiethanolamine(MDEA),N,N-dimethylethanolamine(DMEA).