Modelling of high pressure CO₂ absorption using PZ+AMP blended solution in a packed absorption column

A rate-based steady-state model for CO₂ absorption into a PZ+AMP blended solution is presented by taking into account the column hydraulics, mass transfer resistances and chemical reactions. The simulation results were compared with the experimental results of CO₂ absorption by a PZ+AMP blended solution in a packed absorption column at low and high CO₂ partial pressure conditions. The model predicts CO₂ concentration, amine concentration, the chemical enhancement factor, and liquid temperature profiles along the column. The model was in good agreement to predict the CO₂ concentration profiles along the column at low CO₂ partial pressure. However, it was found that the model needs to be corrected by introducing a correction factor for overall volumetric mass transfer coefficient (K_ga_e) for the simulation of CO₂ concentration profiles along the column at high CO₂ partial pressure conditions in the range of 404-1616 kPa.