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Abstract: Most coals contain a certain amount of sulfur. Upon combustion most of the sulfur is initially oxidized to SO2 and later to SO3 and sulfuric acid. If gaseous SO2 enters the PCC (post combustion capture) plant it is immediately absorbed into the amine solution and transformed initially into sulfurous acid which dissociates into protons and the sulfite ion, SO3 2−. The protons and sulfite remain in the amine solution and is slowly accumulating over time. In this investigation we investigated the long term effect of dissolved SO2 in MEA (monoethanolamine) solutions kept at 100°C; we investigated the effect by following the NMR spectrum of the solution. Additionally we modeled the effect of increasing amounts of accumulated SO2 on the cyclic capacity of the MEA solution as well as the reaction kinetics of dissolved CO2. [Copyright &y& Elsevier]

Abstract: The enthalpy of CO2 absorption into a selection of different amine systems has been calculated, based on the measured enthalpy values and calculated CO2 dissolution values. The results are in good agreement with measured values as reported in the literature. Individual reaction contributions to the enthalpy of absorption have been calculated for 30 mass % MEA and 30 mass % MDEA, yielding information that is essential to the efficient and effective development of improved amine systems for CO2 capture. [Copyright &y& Elsevier]