Heat of absorption of CO2 with aqueous solutions of MEA: new experimental data

Heat of absorption of CO2 and partial pressure of CO2 with aqueous solutions of MEA has been measured in a reaction calorimeter CPA122 at 40, 80, and 120 degrees C for 30 wt% MEA solution and at 120 degrees C for 10 and 70 wt % MEA solutions. Heat of absorption measured in this work is also differential in loading, i. e. CO2 has been added to the reactor in steps. An experimental set-up used by Kim and Svendsen (2007) has been used in this work after a small modification. Experiments show that heat of absorption depends both on loading and temperature, though the temperature dependency is not as high as was reported earlier. Application of the Gibbs - Helmholz correlation for the estimation of the heat of absorption based on experimental PCO2 data is discussed. (C) 2014 The Authors. Published by Elsevier Ltd.