Carbon dioxide sequestration at elevated temperature by pressure swing adsorption

Modeling and simulation of CO2 capture from flue gases of coal fired power plant at high temperature are presented. The work employed a 19% potassium and 1% sodium hydrotalcite adsorbent, for which CO2 capacities in excess 0.84 mol/kg were measured at temperature of 575 K. Elution profiles from a pressure swing adsorption (PSA) unit also enabled analysis of adsorption and desorption process. A cyclic and multibed process for the continuous capture of CO2 was proposed. A mathematical model for the CO2−19% potassium and 1% sodium hydrotalcite adsorbent system, based on measured equilibria and kinetic data, was used for the assessment of the process in terms of CO2 product purity and recovery.