I Multiplicity and Stability in an Adiabatic Stirred Tank Reactor

Exm Ie 10.4m-I Multiplicity and Stability in an Adiabatic Stirred Tank Reactor 

Experimental verification of the above phenomena was provided by Vejtasa and Schmitz [29] for the exothermic reaction between sodium thiosulfate and hydrogen peroxide—a well haracterized test reaction. It is useful for an adiabatic reactor to use an altered rearrangement of Eqs. 10.4.a-l, 2 whereby the rate term is eliminated to give 

this adiabatic operating relation can be used to eliminate the conversion in terms of the temperature and the thermal properties of the fluid, so that the rate of reaction can be written r x T), T) - r (T). Then Eq. 10.4.a-4 becomes 

We see in Fig. 1 that the holding times r = 6.8 and 17.8 sec should be the values between which multiple steady-state and hysteresis phenomena should occur. By starting up the experimental reactor in various ways, and then altering operating conditions, Vejtasa and Schmitz obtained data illustrating this, as shown in Fig. 2. 

We see that good agreements with the above predictions were obtained for the steady-state results. Simulations [29] of the complete transient changes, however, were much more sensitive to the details of the models, especially thermal capacity parameters. 

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