OP-II-3

OP-II-7is modelled by means of a two dimensional pseudo-heterogeneous model: anexperimental study in absence of reaction together with the corresponding modelingapproach is used to characterize hydrodynamics and heat transport processes; thereversible catalyst deactivation, considered via an oxide-reduction dynamics,together with an imposed activity profile are implemented into a well-knownCalderbank et al., kinetic model [8]. The resulting developed reactor model is testedagainst steady state observations, vides Figure 1.a., and used to predict dynamicobservations occasioned when bath temperature is increased 10° K (1°/min) after thefirst steady state has been reached, vide Figure 1.b. The incorporation of the redoxdynamics into the Calderbank kinetics makes this model to lead to better predictionsof temperature observations than the Calderbank’s model on its own. The transientsimulation shows that the developed model is able to predict travelling temperatureprofiles observed during the dynamic operation of this reactor.Temperature, K850800750700a)TemperatureObservationsSimulationSimulationOXOTPTFA10.80.60.40.2Y i=C i/C o oxTemperature, K850800750700b)36 min37.5 min40 min42 min45 min48 min66 min65000 50 100 150 200 250z, cm0 50 100 150 200 250z, cmFigure 1. a)Temperature predictions at steady state. b) Temperature predictions at transientstate: bath temperature is increased 10°K after the first steady state has been reached.References1. Mongkhonsi, T., Kersenbaum, L. Applied Catalysis A: General, 1998. 170: p. 33.2. Lopéz-Isunza, F., Kershenbaum, L.S. Chemical Engineering Science, 1992. 47(9-11): p. 2817.3. Castillo-Araiza, C.O., Modelling of an industrial scaled o-xylene partial oxidation packed bedcatalytic reactor. 2008, Ph.D,Metropolitan Autonomous University-Iztapalapa: México. p. 263.4. Tasker, G.J.H. Trans. Inst. Chem. Engrs. (London), 1946. 24: p. 84-89.5. Anastasov, A.I. Chemical Engineering Journal 2002. 86: p. 287-297.6. Papageorgiou, J.N., Froment, G.F. Chemical Engineering Science, 1995. 50(19): p. 3043-3056.7. López-Isunza, F., Steady state and dynamic behavior of an Industrial fixed bed catalytic reactor.1983, Imperial College, University of London.: Londo, England. p. 299.8. Calderbank, P.H., Chandrasekharan, K., Fumagalli, C. Chemical Engineering Science, 1977. 32: p.1435-1443.111