Summary of Results for Ideal Flow

Consider a reaction represented by A +. . . - products, where A is the limiting reactant. Each segregated packet behaves independently as a batch system, and cA or /A in the packet, as it leaves the reactor, depends on t, the residence time of the packet in the reactor. In the completely mixed stream leaving the reactor, the value is cA or fA, obtained by averaging over all the packets weighted in accordance with the RTD  

for the exit stream (constant-density situation), in the limit of a large number of packets, with dr, we have for both cA and fA (omitting the bar notation)  

Equation 13.5-2 is the segregated-flow model (SFM) with a continuous RTD, E(t). To what extent does it give valid results for the performance of a reactor To answer this question, we apply it first to ideal-reactor models (Chapters 14 to 16), for which we have derived the exact form of E(t), and for which exact performance results can be compared with those obtained independently by material balances. The utility of the SFM lies eventually in its potential use in situations involving nonideal flow, wheic results cannot be predicted a priori, in conjunction with an experimentally measured RTD (Chapters 19 and 20) in this case, confirmation must be done by comparison with experimental results. 

In any case, use of the SFM requires two types of information reaction kinetics, to obtain [cA(r)/cAJBR, and RTD, to obtain E(t). 

13-1 Describe an experiment that could be used to measure each of the following U)F(t) (b)W(ty,(c)E(t). 

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