In this paper, we present the design, development, and operation of a reactor system for CO<
sub>
2<
/sub>
capture. Modifications were implemented to address differences in sorbent from 180 ?m Geldart group B to 115 ?m Geldart group A material
operational issues were discovered during experimental trials. The major obstacle in system operation was the ability to maintain a constant circulation of a solid sorbent stemming from this change in sorbent material. The system consisted of four fluid beds, through which a polyamine impregnated sorbent was circulated and adsorption, preheat, regeneration, and cooling processes occurred. Pressure transducers, thermocouples, gas flow meters, and gas composition instrumentation were used to characterize thermal, hydrodynamic, and gas adsorption performance in this integrated unit. A series of shakedown tests were performed and the configuration altered to meet the needs of the sorbent performance and achieve desired target capture efficiencies. Methods were identified, tested, and applied to continuously monitor critical operating parameters including solids circulation rate, adsorbed and desorbed CO<
sub>
2<
/sub>
, solids inventories, and pressures. The working capacity and CO<
sub>
2<
/sub>
capture efficiency were used to assess sorbent performance while CO<
sub>
2<
/sub>
closure was used to define data quality and approach to steady-state. Testing demonstrated >
90% capture efficiencies and identified the regenerator to be the process step limiting throughput. Sorbent performance was found to be related to the reactant stoichiometry. Finally, a stochastic model with an exponential dependence on the relative CO<
sub>
2<
/sub>
/amine concentration was used to describe 90% of the variance in the data.