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Oxidations of organic compounds in liquid phase by oxygen have been applied for years in many important industrial and waste water treatment processes. There are several variants of technical design of these processes – ranging from homogeneous through heterogeneous to biotechnological routes. As an example, the process of gluconic acid production by glucose oxidation can be arranged in all of these variants. Bioprocesses are usually carried out in aqueous media at ambient temperature and atmospheric pressure in the presence of living microorganisms and their enzymatic apparatus (e.g. Aspergillus niger), or by using pure enzymes (glucose oxidase and catalase), (Sikula, et al. (2006), (2007) ). In the former case, the biomass represents a solid phase in the reaction system, whereas in the latter case, the reaction system is homogeneous – liquid. Some drawbacks are also inherent with the bioprocesses – e.g. strong sensitivity of microorganisms to impurities present in the reaction system, losses of the substrate transformed to carbon dioxide or utilized for the microorganisms growth, low solubility of oxygen in the reaction system owing to the presence of ionic salts and nutrients (e.g. glucose) with a high rate of oxygen consumption by the microorganisms on the other hand, frequent occurrence of non-newtonian hydrodynamic properties of biomass suspension, foam formation, etc. For such bioprocesses, gas-lift reactors (known as air-lift reactors) (GLRs) are often used for their capability of delivering oxygen to the growing culture at a sufficient rate, while maintaining low shear stress. Heterogeneous catalyst application to the oxidation process is advantageous compared to homogeneous catalytic systems with respect to simpler separation of a catalyst from the reaction mixture by filtration. At the heterogeneous variant however, a catalyst selection and its optimization is one of the crucial points to be considered. Another one is the reactor type selection and its design (estimation of the geometry and the size of the reactor selected). Neither the authors’ experience, nor literature search provide many generalizations on selection of a reactor type for which a counter-example could not be thought up. An open

Optimal Design of a Multifunctional Reactor for Catalytic Oxidation of Glucose with Fast Catalyst Deactivation