Removal of carbon dioxide by reactive crystallization in a scrubber-kinetics of barium carbonate crystals

A bubble column scrubber was utilized to remove simulated CO waste gas under a constant pH value. Using barium chloride solution as an absorbent reacting with CO2-gas in the scrubber under an alkaline solution condition. precipitates of barium carbonate were formed during the operation. Measured crystal size distributions at a given time were used to calculate the growth rate of barium carbonate crystals, which is proportional to a 1.49 order of relative supersaturation. This demonstrates that both mass transfer and surface integration are important to the crystal growth of barium carbonate. The classical nucleation theory can be used to describe the nucleation rate of barium carbonate. In addition, the agglomeration kernel is proportional to a 2.86 order of relative supersaturation. (C) 2002 Elsevier Science B.V. All rights reserved.