CARBON DIOXIDE ABSORPTION IN AQUEOUS SOLUTION OF DIMETHYLAMINOETHANOL

Abstract

Amine-based carbon capturing processes have widely been utilized in fossil-fired power plants which are regarded as a large stationary source of carbon dioxide emission. Monoethanolamine (MEA) and methyldiethanolamine (MDEA) aqueous solution are the alkanolamine used commercially because of their great absorption performance. However, there still are some major drawbacks, such as high energy consumption and low cyclic capacity for MEA and low absorption rate for MDEA. Consequently, exploration of novel solvent is of interest to compensate of such drawbacks. In this work, solubility of carbon dioxide in a novel promising solvent, Dimethylaminoethanol (DMAE) was examined under various experimental conditions in comparison with those of MEA and MDEA. The effect of solvents concentration was studied and varied in a range of 3, 4 and 5 molar. Influence of carbon dioxide content in simulated flue gas was examined by varying carbon dioxide partial pressure in a range of 5 - 100 kPa. Furthermore, effect of temperature was also investigated at 30, 40, 60 and 80 degrees Celsius. It was found that DMAE exhibited outstanding performance on carbon dioxide loading over both MEA and MDEA. Furthermore, DMAE could provide the greater average cyclic capacity than MEA for 241% and the greater average cyclic capacity than MDEA for 12%.