Gas−liquid reaction kinetics of the reactions between carbon dioxide and hydroxide ions is
obtained via dynamic experiments in a stirred cell reactor. The evaluation of experiments is
performed using a new technique enabling experimental series without time-consuming solvent
purification after each experiment. A new expression for the reaction rate constant at infinite
dilution is obtained. Furthermore, a kinetic description of aqueous potassium hydroxide and
aqueous sodium hydroxide solutions in the temperature range between 20 and 50 °C is proposed.
Absorption of gases in liquid solutions accompanied by chemical reactions, or reactive absorption, represents one of the most important industrial operations. The advantages of this process are enhanced solution capacity, low impurity concentrations up to the ppm range, moderate operation pressure, and selective removal of contaminants. Reactive absorption is based on a combination of various kinetically controlled phenomena, the focus being on the coupling of chemical reactions and mass transfer in multicomponent mixtures. Therefore, the process description using the equilibrium concept is often insufficient and kinetic modeling is required. This paper describes the basics of rigorous modeling of reactive absorption processes. Several case studies are used in order to validate the models. In addition, a discussion of necessary model parameters, like diffusion coefficients and reaction kinetics, is given. A reduced model with lower computation time is obtained via detailed sensitivity analysis. This model is successfully used in dynamic simulations. In this respect, a proper consideration of the film reactions appears to be crucial.
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