(733c) Rate-Based Modeling of CO2 Absorption and Desorption Into Aqueous Monoethanolamine Solutions

Zhang, Y., AspenTech Limited

Nineteen CO2/monoethanolamine (MEA) absorption and desorption data sets from recent pilot plant studies at the University of Kaiserslautern[i] have been simulated with Aspen Plus. Simulations were performed using both rigorous rate - based calculations and the traditional equilibrium – stage approach. Rate - based results have been generated for several mass transfer/interfacial area correlations available in the open literature. Key performance measurements, including CO2 removal efficiency in the absorber, temperature and CO2 concentration profiles in the absorber and the desorber, and the desorber reboiler duty, are then compared to experiment.  We have found that the quality of the rate ‑ based results is strongly tied to the choice of the underlying mass transfer/interfacial area correlations selected for use in the simulation. In contrast, the equilibrium-stage model fails to reliably predict these key performance variables.

[i] Mangalapally, H. P.; Hasse, H. Pilot Plant Study of Post-Combustion Carbon Dioxide Capture by Reactive Absorption: Methodology, Comparison of Different Structured Packings, and Comprehensive Results for Monoethanolamine, Chemical Engineering Research and Design, 2011(89), 1216-1228.