CO2 absorption into loaded aqueous MEA solutions: impact of 1 different model parameter correlations and thermodynamic models 2 on the absorption rate model predictions 3 Koteswara Rao Putta, Hallvard F. Svendsen, Hanna K. Knuutila * 4 Department of Chemical Engineering, Norwegian University of Science and Technology, N- 5 7491 Trondheim, Norway 6 Abstract: 7 One-dimensional rate based model was used for assessing the impact of correlations and/or 8 models for VLE (thermodynamics), solubility (CO2 henry’s law constant), reaction rate kinetic 9 models and diffusivity of CO2 in aqueous MEA solutions on the performance of absorber for lab- 10 scale CO2 capture. Experimental data from four different set-ups covering wide range of 11 condition was utilized for the assessment. Four different thermodynamic models and eight 12 different henry’s constant correlations/models including the Aspen Plus V8.6 e-NRTL-RK 13 model was used in the study to evaluate the impact. Even though the individual models and 14 solubility were validated with independent experimental data, the use of different models gave 15 different predictions when used in the rate based simulation. It was seen that the impact of using 16 different henry’s law constant correlations was observed to have very huge effect on model 17 predictions. Seven different reaction rate kinetic models were used to study impact on model 18 prediction accuracy and it was found that no single kinetic model able to predict the 19 experimental data from all the sources better than the base case kinetic model. Also it was seen 20 that transport property (CO2 diffusivity in MEA) correlations could have large impact on the 21 * Corresponding author: hanna.knuutila@ntnu.no