Heat of absorption of CO2 in aqueous solutions of DEEA and DEEA plus MAPA blends-A new approach to measurement methodology

The heat of absorption is an important parameter that affects the CO2 absorption and stripping performance of amine-based CO2 capture. The present paper aims at development of the experimental method of determining the heat of absorption using a batch reaction calorimetry. A prospective high-capacity CO2-capturing solvent based on an aqueous solution of N,N-diethylethanolamine (DEEA) blended with small concentrations of 3(methyloamino)propylamine (MAPA) is therefore studied. The differential and integral heat of absorption of CO2 was measured at 40 degrees C and 60 degrees C using single DEEA and amine blends. Experiments show that the heat of absorption in DEEA and DEEA + MAPA blends depends both on loading and temperature, though the temperature dependency is not as high as reported earlier. Increasing the MAPA/DEEA concentration ratio increased the heat of absorption in the amine blends.