(612c) Process Analysis of Amine-Functionalized Adsorbents for CO2 Capture Applications

Amine-functionalized adsorbents such as MIL-101(Cr) impregnated with poly (ethyleneimine) (PEI) and Mg₂(dobpdc) functionalized with N,N’-dimethyl ethylene diamine (MMEN) have shown high capacity and stability for CO₂ capture under different concentrations. The stepped CO₂ adsorption isotherm in mmen-Mg₂(dobpdc) also allows for a high working capacity in a temperature swing process. However, nearly all analyses of such systems have focused on equilibrium adsorption assessments, whereas a robust process must take into account equilibrium capacity, kinetics, and the shape of the isotherm. In this work, CO₂ adsorption in these materials was studied using packed bed and thermogravimetric systems. The effects of flowrate and temperature on the breakthrough profiles were studied. Mass transfer during CO₂ adsorption was modeled using a linear driving force model and the performance of the system was evaluated using the productivity of the bed (mmol/g/h) for different concentrations and flowrates. Overall, this talk will address many aspects that can enable system design considering the adsorbent combined with specific CO₂ application conditions.