Global warming arguments have gained more and more attention due to the new regulations of carbon dioxide emission in the world. Monoethanolamine (MEA) has been employed as an important industrial absorbent for CO2 capture since the 1930s. The concentration of MEA in aqueous solution is generally increased to 30 mass % in the CO2 capture process. To reduce the energy consumption and improve the efficiency of CO2 capture in the present MEA process, further increase in solution concentration of MEA is a potential solution. Basic research on the properties and reaction kinetics with CO2 of concentrated aqueous MEA solution is investigated in this work. The book is a PhD dissertation.