Kinetic and Thermodynamic Analysis of High-Pressure CO2 Capture Using Ethylenediamine: Experimental Study and Modeling

One of the alternatives to reduce CO2 emissions from industrial sources (mainly oil and gas industry) is capture. Absorption with chemical solvents (alkanolamines in aqueous solutions) most widely used conventional technology for Despite competitive advantages solvents, technological challenge improving absorption process apply alternative reducing energy demand increasing captured per unit solvent mass. This work presents an experimental study related kinetic thermodynamic analysis high-pressure capture using ethylenediamine (EDA) as a solvent. EDA has two amine groups that can increase capacity A non-stirred setup was installed commissioned testing. Tests solubility water were carried out validate setup. testing accomplished solutions (0, 5, 10, 20 wt.% amine). Finally, model involving steps proposed, including rapid step slow diffusion step. accelerated performance. Sudden temperature increases observed during initial minutes. The triggered after minimal amount (~10 mmol) into liquid solutions, could correspond “lean acid loading” typical sweetening alkanolamines. At equilibrium, there linear relationship between loading concentration. behavior obtained adapts accurately (AAD < 1%) mechanism.