Władysław Moniuk

Modelling of the coalescence/redispersion processes in bubble columns

Abstract In order to determine physically formed relations between bubble characteristics and physicochemical properties of the liquid employed, bubble size distributions and average bubble diameters were calculated using a simplified version of the theoretical model developed by Prince and Blanch (A.I.Ch.E. Journal, 36 (10) (1990) 1485–1499). The results of calculations were compared with experimental data, obtained using two different columns: a laboratory column and a pilot plant column. Good agreement was found between calculated and experimental values.

Kinetic model of cyclohexane oxidation

A model of the process of the catalytic cyclohexane oxidation in the liquid phase, including both reaction kinetics and mass transfer, is presented. As catalysts cobalt napthenate and chromium napthenate were used. The reaction rate constants as well as the activation energies were determined on the basis of the experimental results obtained in a laboratory reactor. A mathematical model of an industrial reactor for the cyclohexane oxidation is also presented. The results of the cyclohexane oxidation simulations are compared with the data from different industrial reactors (CYCLOPOL process).

Liquid-phase oxidation of cyclohexane : modeling and industrial scale process simulation

Abstract New models of the process of cyclohexane oxidation in the liquid phase, including both reaction kinetics and mass transfer, are presented. The models have been used for the simulation of the industrial process in order to determine the influence of the hydrodynamic factors on the conversion and selectivity. The results of simulation are compared with the industrial data (CYCLOPOL process). Good agreement with experimental data was obtained using kinetic models comprising the free radical formation stages.

Plate efficiency in the process of absorption with chemical reaction — experiments and example calculations

The relationships and diagrams proposed earlier permitting the evaluation of point and Murphree plate efficiencies were verified experimentally for the absorption of carbon dioxide from air on a sieve plate. The following absorbents were employed: aqueous solutions of potassium and sodium hydroxides and carbonates, and aqueous solutions of potassium and sodium carbonates containing diethanolamine or sodium arsenite. An example of the plate efficiency calculations is also presented.

Plate efficiency in the process of absorption with chemical reaction — general relations

Abstract Relations for the point and Murphree plate efficiencies were obtained by solving differential equations of balance of the reacting components for the cross-current flow dispersion model, and the kinetic equations of mass transfer with chemical reaction for film and penetration models. First-, pseudo-first-and second-order chemical reactions in instantaneous, fast and slow reaction regimes were considered. The analytical and numerical results are presented in the form of generalized diagrams.