TY - JOUR
T1 - Thermodynamic and kinetic properties of NH3-K2CO3-CO2-H2O system for carbon capture applications
AU - Lillia, Stefano
AU - Bonalumi, Davide
AU - Fosbøl, Philip L.
AU - Thomsen, Kaj
AU - Jayaweera, Indira
AU - Valenti, Gianluca
PY - 2019
Y1 - 2019
N2 - An innovative solvent based on the quaternary system CO2-NH3-K2CO3-H2O is reported and characterized in terms of its thermodynamic properties and rate of CO2 absorption. Thermodynamic properties of the solvent such as vapor-liquid equilibrium, solid-liquid equilibrium, and the heat of desorption were modelled with the Extended UNIQUAC thermodynamic model. The kinetics of CO2 absorption in the solvent were studied experimentally with a wetted wall column set-up. The absorption rate was investigated with respect to temperature, ammonia concentration, potassium carbonate concentration, and CO2 loading, under the typical operating conditions of a capture plant. Globally, the solvent has a number of interesting properties for CO2 capture applications. Indeed, adding K2CO3 to the ammonia solvent reduced both the ammonia slip and the heat of desorption. Experimental analysis showed that the kinetics of absorption were mainly influenced by the reaction between free ammonia and CO2. Hence, the overall mass transfer coefficient decreased when increasing the K2CO3 content of the solvent.
AB - An innovative solvent based on the quaternary system CO2-NH3-K2CO3-H2O is reported and characterized in terms of its thermodynamic properties and rate of CO2 absorption. Thermodynamic properties of the solvent such as vapor-liquid equilibrium, solid-liquid equilibrium, and the heat of desorption were modelled with the Extended UNIQUAC thermodynamic model. The kinetics of CO2 absorption in the solvent were studied experimentally with a wetted wall column set-up. The absorption rate was investigated with respect to temperature, ammonia concentration, potassium carbonate concentration, and CO2 loading, under the typical operating conditions of a capture plant. Globally, the solvent has a number of interesting properties for CO2 capture applications. Indeed, adding K2CO3 to the ammonia solvent reduced both the ammonia slip and the heat of desorption. Experimental analysis showed that the kinetics of absorption were mainly influenced by the reaction between free ammonia and CO2. Hence, the overall mass transfer coefficient decreased when increasing the K2CO3 content of the solvent.
KW - CO2 capture
KW - Kinetics
KW - Rate of absorption
KW - Ammonia
KW - Mixed-salt technology
KW - Experimental measurements
U2 - 10.1016/j.ijggc.2019.03.019
DO - 10.1016/j.ijggc.2019.03.019
M3 - Journal article
SN - 1750-5836
VL - 85
SP - 121
EP - 131
JO - International Journal of Greenhouse Gas Control
JF - International Journal of Greenhouse Gas Control
ER -