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Essentials of Chemical Reaction Engineering, 2nd Edition by H. Scott Fogler

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13. Unsteady-State Nonisothermal Reactor Design

Chemical engineers are not gentle people, they like high temperatures and high pressures.

—Prof. Steven LeBlanc

Overview. Up to now we have focused on the steady-state operation of nonisothermal reactors. In this chapter the unsteady-state energy balance will be developed and then applied to CSTRs, as well as well-mixed batch and semibatch reactors. We will use the difference between the rate of “heat generated,” Qg, and the rate of “heat removed,” Qr, to arrive at the user-friendly form of the energy balance

dTdt=Qg.Qr.ΣNiCPi

Section 13.1 shows how to arrange the general energy balance (Equation (11-9)) in a more simplified form for unsteady-state operation.

Section 13.2 discusses the ...

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