III International Conference

PP-III-70respective variational problem. Mass transfer limitations or non-isothermal temperatureprofile is a necessary condition for potential optimization of the catalyst distribution along thebed length. Beyond the region of mass-transfer resistance and at a constant catalysttemperature, the reactant conversion is independent of the active component distributionalong the bed. Under isothermal conditions with linear dependence of the reaction rate onreactant concentration at a constant mass-transfer coefficient, the uniform distribution isoptimal. In the case of non-linear dependence of the reaction rate on reactant concentrationthe optimal distribution allows the total active component loading to be minimized, theeconomy being dependent on the mass transfer intensity and increasing with an increase in thetotal active component amount. The most efficient optimization in adiabatic reactor withexothermic reaction can be achieved if reaction ignition occurs in some point inside the bed.In this case, the use of the optimal activity distribution can facilitate ignition in the inlet partof the catalyst bed that allows considerable decrease of the active component loading in otherregions. It has been shown, that some other theoretical problems are to be solved in this case,for example, the problem of multiple solutions that can appear at activity redistribution.References1. Cominos, V.; Gavriilidis, A. Chem. Eng. Sci. 2001, 56, 3455-3468.2. Psyllos A.; Philippopoulos C. Ind. Eng. Chem. Res. 1993, 32, 1555-1559.3. Khanaev, V.M.; Borisova, E.S.; Galkina, L.I.; Noskov, A.S. Chem. Eng. J. 2004, 102, 35-44.4. Melis, S.; Varma, A.; Pereira, C.J. Chem. Eng. Sci. 1997, 52, 165-169.5. Khanaev, V.M.; Borisova, E.S.; Noskov, A.S. Chem. Eng. Sci. 2004, 59, 1213-1220.6. Khanaev, V.M.; Borisova, E.S.; Noskov, A.S. Chem. Eng. Sci. 2005, 60, 5792-5802.7. Khanaev, V.M.; Borisova, E.S.; Noskov, A.S. Doclady Chemistry. 2002, 385, 228-231.8. Khanaev, V.M.; Borisova, E.S.; Noskov, A.S. Theoretical Foundations of Chemical Engineering.2005, 39, 478–486.601