Elements of Chemical Reaction ering 4th Ed - H. Scott Fogler 50

Elements of Chemical Reaction ering 4th Ed - H. Scott Fogler 50

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d 8 Mole Balances Chap. 1 reactor volume, K For a fluid-solid heterogeneous system, the rate of reaction of a substance A is defined as -r; = mol A reacted/s.g catalyst The mass of solid catalyst is used because the amount of the catalyst is what is important to the rate of product formation. The reactor volume that contains rhe catalyst is of secondary significance. Figure 1-1 3 shows a schematic of an industrial catalytic reactor with vertical tubes packed with catalyst. Product gas t Feed gas Figure 1-13 Longitudinal cataly~ic packed-bed reactor [From Cmpley, American Institute of Chemical Engineers. 8612). ?4 t I99U). Reproduced with perrnik~ion of the American In~titute of Chemical Enpinccrs.
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Unformatted text preview: Copynpht O 1 9 0 AIChE. All right\ reserved ] In the three idealized types of reactors just discussed (rhe perfectly mixed batch reactor. the plug-flow tubular reacror 1PFR). and the perfectly mixed con- tinuous-stirred rank reactor (CSTR), the design equations (i.e. . mole balances) PRR were developed based nn reactor volume. The derivation of the design equation Mole B~~~~~~ For a packed-bed catalytic reacror (PRR) will be carried out in a manner analo- gous to the development of the tubular design equation. To accomplish this der- ivation, we simply replace the voFume coordinate in Equation (1-10) with the catalyst weight coordinate W (Figure 1-14), Figure 1-14 Pncherl-lxcf reactor srhem;~tic....
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