A new modeling approach for a CO2 capture process based on a blended amine solvent

Abstract The modeling procedure of an absorption-based carbon capture process using a blended amine solvent is presented. Semi-empirical correlation equations were developed for modeling the CO 2 vapor-liquid equilibrium (VLE) and absorption rate in the ternary aqueous amine solvent used in this study. To reflect the non-ideality of the blended amine solvent in a CO 2 loaded state, correction terms based on the fresh amine and free amine concentrations were added to the CO 2 VLE and CO 2 absorption rate models, respectively. The developed model was implemented in the commercial software PRO/II ® by means of a user-added subroutine. Both the absorber and stripper were represented by rate-based models. The process behavior predictions by the proposed simulation model were compared with the pilot plant operation data. A quite satisfactory agreement between the model and data was obtained, which verifies the effectiveness of the proposed solvent modeling techniques.