The dry sorbent CO 2 capture process is an advanced concept to efficiently remove CO 2 from flue gas with two fluidized-bed reactors. This paper summarizes the results of performance of the two fluidized-bed reactors in the continuous solid circulation mode to investigate the feasibility of using potassium carbonate-based solid sorbent (Sorb KX35). The parameters such as gas velocity, solid circulation, carbonation temperature, and water vapor content were investigated during several continuous operations of two fluidized-bed reactors. The CO 2 removal increased as gas velocity was decreased and as solid circulation rate was increased. The CO 2 removal ranged from 26% to 73% was rather sensitive to the water vapor content among other parameters. A 20h continuous operation conducted in a bench scale fast fluidized-bed reactor system indicated that the spray-dried potassium-based sorbent, Sorb KX35 having superior attrition resistance and high bulk density, had a promising CO 2 removal capacity of 50–73% at steady state and was able to regenerate and reuse. The results from this work are good enough to prove the concept of the dry sorbent CO 2 capture process to be one of viable methods for capturing CO 2 from dilute flue gas of fossil fuel-fired power plants.