KINETICS OF LIQUID-FILM PROCESS IN GAS-ABSORPTION - PART 1 - MODELS OF THE ABSORPTION PROCESS

Three models of the processes involved in the absorption of gas into a gitated liquids are compared. These are: steady-state diffusion throug h a stagnant film; transient absorption into surfaces which are system atically replaced by fresh liquid; and transient absorption into surfa ces which are randomly replaced. It is shown that the three models lea d to closely similar predictions about the effect of physico-chemical variables (solubility, diffusivity, reaction rate, etc.) on the rate o f absorption. Hence if one of the models is correct the effects of cha nges in these variables will not distinguish between them, but on the other hand the formulae derived for any of the models can be used for prediction.