Abstract
Film and penetration theory solutions are presented for gas absorption accompanied by a two-step chemical reaction involving a transient intermediate species. For the case of equal diffusivities, the two theories agree with each other within 6 per cent. When the intermediate species is relatively long-lived, φ, the factor by which the chemical reaction enhances the absorption rate, goes through a maximum as liquid phase contact time increases, and φ approaches its ultimate asymptote from above. This unique behaviour is not found in gas absorption accompanied by a single chemical reaction, but aspects of this interesting behaviour have been observed in published experimental data for the carbon dioxide-monoethanolamine system and for the chlorine-ferrous chloride system.
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