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Acid protonation constant (K a ) is one of the parameters required for thermodynamic modelling. In addition, a rigorous thermodynamic model requires solvent non-ideality properties in order to have a better model representation. This study aims to evaluate species activity coefficients from potentiometric titration data of the MEA-H2O system at temperatures ranging from 303 to 333K. The results show that the activities of the free MEA and the protonated MEA depend on pH. In addition, the activity coefficients of the protonated MEA determined by the extended Debye-Hückel model were less than unity at different temperatures. This means that the system observed was the non-ideal one.

Amine-based Carbon Dioxide Absorption: Evaluation of Species Activity Coefficient for MEA-H2O System from 303 to 333K