Abstract
The effect of the presence of carbon dioxide on the absorption mechanism and the absorption rate of iodine vapor was investigated at 298 K using a laminar liquid jet column and continuous-flow stirred-vessel absorbers.
The existence of carbon dioxide in the gaseous phase decreased the absorption rate of iodine. The first effect was an increase in the gas film mass transfer resistance. The second effect was a decrease in the hydrolysis rate of iodine dissolved in the liquid phase. This was caused by the competitive base-catalytic hydrolysis of the two acidic gases taking place in the aqueous phase. Moreover, the presence of hypoiodous acid was found to accelerate the hydrolysis rate of carbon dioxide.
