Fixed Bed Reactors with Heat Exchange Between the

5 Fixed Bed Reactors with Heat Exchange Between the Feed and Effluent or Between the Feed and Reacting Gas. Autothermal Operation  

In industrial operation it is necessary, for economic reasons, to recover as much as possible the heat produced by exothermic reactions. One obvious way of doing this, mentioned earlier in Section 11.3, is to preheat the feed by means of the reacting fluid and/or the effluent. When the heat of reaction is sufficient to raise 

Consider a single reaction and let the pressure drop over the reactor be small so that a mean value may be used with sufficient accuracy. Then, the continuity equation for the key component and the energy equations for the reactor and the heat exchanger, respectively, may be written (in the steady state) 

In the heat exchanger, with reference to the complete system inlet and outlet temperatures, j (z =o) = 7  

Single adiabatic bed with preheat of reactants by means of effluent. 

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