Influence of pKa and Amine Structure on Energy Consumption of Post-combustion CO2 Capture Processes

Abstract

We present a new physical-property-based model for calculating the energy requirement for the post-combustion capture of carbon dioxide by absorption in aqueous amine solutions for any arbitrary amine. The only inputs the model requires are the amine's molecular structure and the amine's pKa as a function of temperature. Combined with a process model, this solvent model allows for estimation of CO2 capture energy consumption based on the amine structure and pKa. This technique enables solvent screening on the basis of imposed load, with minimal knowledge of properties of candidate solvents.