Abstract
Interference laser microscopy was used to study the macrokinetics of absorption of carbon dioxide by aqueous solutions of chemisorbents. Chemisorption was shown to be a complex and multistage process. Its evolution included the occurrence of a diffusion-controlled chemical reaction close to the interphase boundary, the appearance of interphase instability, and the development of spontaneous small- and large-scale convection in the liquid phase. The characteristic dimensions of small-scale convective structures and their dependence on the concentration and chemical nature of absorbents were determined. The brim meniscus of wetting was shown to play a fundamental role in the appearance of large-scale convective flows. The main physicochemical rules governing interphase boundary stability loss by the chemicapillary mechanism during chemisorption were considered. A description of a large-scale spontaneous convection in the liquid phase appearing under the influence of the brim meniscus of wetting and resulting in the self-emulsification of a reaction product layer was suggested. Changes in surface tension at the reaction product-chemisorbent boundary resulting in the appearance of an elastic component of product layer deformation were estimated. It was shown that, because of the Weissenberg effect, tangent stresses in a product layer flowing down the brim meniscus of wetting can cause the appearance of tensile strain, nucleation, and formation of desorption microbubbles earlier recorded in several experiments by laser spectroscopy.