Unsteady Operation of Plug-Flow Reactors

In the CD-ROM, the unsteady energy balance is derived for a PFR. Neglecting changes in total pressure and shaft work, the following equation is derived  

Numerical solution required for these three coupled equations 

This equation must be coupled with the mole balances  

Unsteady-State Nonisotheimal Reactor Design Chap. 9 

The subscript to each of the problem numbers indieates the level of difficulty A, least difficult D, most difficult. 

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Unsteady Operation of Plug Flow Reactors Addif ional Homeworic Problems... 

R 13.6. Adiabatic Operation of a Batch Reactor R 13.7, Unsteady Operation of Plug Flow Reactor... 

Up to now we have focused on the steady-state operation of nonisothermal reactors. In this section the unsteady-state energy balance wtU be developed and then applied to CSTRs, plug-flow reactors, and well-mixed batch and semibateh reactors. 

Three important (complicating) possibilities were not considered in the treatment of reactors presented in earlier chapters (1) the residence time of the reactant molecules need not always be fully defined in terms of plug flow or fully mixed flow (2) the equations describing certain situations can have more than one solution, leading to multiple steady states and (3) there could be periods of unsteady-state operation with detrimental effects on performance, that is, transients could develop in a reactor. 

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