Characterization of carbon dioxide capture by glucosamine: Liquid phase speciation and degradation

•Bicarbonate is the product of CO2 absorption in glucosamine.•The stoichiometry allows to reach high CO2 loadings.•High temperatures produce important degradation. Carbon dioxide capture by chemical absorption can be improved attending to the reaction mechanism due to the different stoichiometry shown by the most important reactions (mainly production of bicarbonate/carbonate ion, and carbamate) involved in the process. The weight of each reaction upon the carbon dioxide absorption determines the loading value and the rate of amine consumption which can influence upon reaction rate. On the other hand, the degradation rate of amines during the regeneration step can play a very important role in carbon dioxide separation process increasing the amount of amine make-up flow-rate.