| Abstract: | Mass transfer of dissolved gas from a liquid into a rising bubble swarm of inert gas is a transitoric reaction. The theory of such processes is described. The extraction of carbon dioxide dissolved in water by air purging was measured as a model reaction. It was found that the overall rate constant of the reaction is almost exclusively determined by the purging-gas blowing-rate. Nozzle position and number of nozzles have no influence on the reaction rate. This finding is explained by the fact, observed elsewhere, that the bubble size distribution function is constant and only a function of the liquid's physical properties. The measured rate constants agree with theoretically calculated ones, if the influence of turbulence on mass transfer into the bubbles is considered. |
