Application to an Isothermal Back-Mixed Reactor

Strots et al. (1992) undertook a study of composition forcing employing the Balzhinimaev model given in Table IV for the simplest reactor situation  

Model of a Non adiabatic Packed Bed Reactor for S02 Oxidation Incorporating 

Multiple resonance was observed at T = 723 K and ts = 0.01 s. The enhancement. F, exceeds 1 at a cycle period between 0.2 and 0.3 s and also at greater than 1000 s, although quasi steady state is also attained at about that period. Resonance also occurs at two different cycle periods at ts = 0.02 s, F is much smaller. As the space-time increases above 0.25 s, the rate enhancement becomes very small and the multiple resonance phenomenon seems to disappear. 

If the SO2 and O2 concentrations are switched 180° out of phase so that S02 is absent from the reactor feed during one half cycle and O2 is absent in the other half cycle, Fig. 6 shows that F is less than 1 regardless of the cycle period. Forcing just the SO2 concentration at a constant 02 concentration also fails to enhance the rate of SO2 oxidation in a back-mixed reactor. Even though the experiments of Unni et al. (1973), discussed earlier, were performed under isothermal conditions and differentially so that they could have been simulated by Strots model, the strategy used by Unni was different from those investigated. Nevertheless, one of the experiments undertaken by Unni switched between a reactant mixture and a feed that did not contain SO2. This experiment exhibited F 1. Strots model predicts this observation. 

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