Abstract. Carbon dioxide as one of the major contributors to the global warming problem is produced in large quantities by many important industries and its emission seems to rise from year to year. Aminebased absorption is one of the methods to capture CO 2 from its sources. As a reactive system, mass transfer and chemical reaction take place simultaneously. In a vapor-liquid equilibrium model for the CO 2 -amine-water system, some parameters such as mass transfer coefficients and chemical equilibrium constants need to be known. However, some parameters could be determined experimentally and the rests could be regressed from the model. The protonation constant (pK a ), as one of the model parameters, could then be measured experimentally. The purpose of this study is to measure the pK a of monoethanolamine (MEA) at a range of temperatures from 303 to 330K by a potentiometric titration method. The experimental data obtained were in a good agreement with the literature data. The pK a data from this work together with those from the literature were then correlated in an empirical correlation to be used for future research.

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Global warming caused by greenhouse gas emissions, e.g. carbon dioxide (CO 2 ), in the atmosphere is now becoming a very serious problem facing the world community. Carbon dioxide emission increase from year to year, thus a necessary effort to reduce CO 2 is required. Amine-based absorption is one of the methods for post-combustion capture. Monoethanolamine (MEA) is commonly used for CO 2 capture solvent. This study aims to measure protonation constant (pK a ) of MEA from 30 to 60°C using the potentiometric titration method. The results show that the pK a values of MEA are in general agree with the literature data. For instance, the pK a value of MEA at 30°C is 9.83 and that obtained from the literature is 9.80. Comparison between those two values gives a deviation of 0.22%.