Experimentally based evaluation of accuracy of absorption equilibrium measurements

The accuracy of absorption equilibrium measurements for the system CO2-water-Monoethanolamine (MEA) has been discussed by various authors in the context of choosing data to fit parameters to proposed mathematical / thermodynamic models to represent the measured data. The reported data for this system have been generated from 1935. Since absorption equilibrium values directly influence the mass transfer driving force and thus the height of an absorption column, it is of great interest to establish a better base for judging the uncertainty of absorption equilibrium data. In this work a set of absorption experiments were run with 30%(wt) MEA to perform equilibrium measurements for CO2-water-MEA system at atmospheric pressure, 40 °C temperature and different CO2 loading conditions. The results were compared with the literature values, and a detailed uncertainty analysis was done for the final results by using GUM and QUAM methods.