Year: 1995
Type: article
Abstract: In the present paper we summarize the work, both theoretical and experimental, done in the Institute of Chemical Engineering of the Polish Academy of Sciences in Gliwice over almost two decades and concerning surface phenomena accompanying the process of absorption with chemical reaction. First, a model of these phenomena is derived based on the assumption that the cellular convection is driven by surface tension gradients, induced in turn by infinitesimally small perturbations of concentration. Next, experiments are presented on the absorption of carbon dioxide into aqueous solutions of monoethanolamine, diethanolamine and sodium hydroxide. The experiments were carried out in both wetted-wall and packed columns, and they made it possible to decribe quantitatively the effect of the Marangoni convection on the rate of mass transfer . Finally, it is demonstrated that the theoretical model, all its limitations notwithstanding, allows an analysis to be carried out of certain characteristics of the process of chemical absoption. Thus, the probability of oscillatory modes occuring in the system is discussed, the dimensions of the convective cells are evaluated and the gas—liquid contact time necessary for the instability to appear is determined. The quantitative conclusions are compared with the relevant experimental data concerning the absoption of CO 2 into monoethanolamine.
Institutions: Institute of Chemical Engineering, Polish Academy of Sciences
Language: English
Subfield: Filtration and Separation
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2000933279