Characterization of Amine-impregnated adsorbent for CCS post combustion

Four pure amines were tested in a rapid screening apparatus to study hydroxyl and amine functionalities. The apparatus was validated with an aqueous 30 mass % MEA solution. The result shows that a viscous loaded solvent was the main challenge. The initial absorption rate for pure MEA was significantly higher than that of MEA in 30 mass % aqueous solutions. Pure DEA showed the lowest initial absorption rate while polyamines such as MAPA and DETA gave the highest absorption rates. The equilibrium CO2 capacity of amine was shown to correspond to the number of amine functionalities. The hydroxyl functionality might contribute by maintaining the interfacial tension of the gas/liquid during the process. The carbamate and bicarbonate formation are the main reaction products in the systems as seen in the NMR results. (C) 2014 The Authors. Published by Elsevier Ltd.