In Figures 23. 8 and 23. 9, the volumetric flowrate to the reactor was held constant at increased temperatures by reducing the hydrogen in the feed. This altered the feed concentration. Investigate the alternative of reducing the total feed rate (at the same composition) to maintain constant volumetric flowrate.

a. Plot the cumene production rate versus temperature, and compare to Figure 23. 8.

b. Plot the selectivity (cumene generated/DIPB generated) versus temperature, and compare to Figure 23. 9.

Problems 23. 17-23.20 investigate the performance of the cumene reactor (fluidized bed), described in Section 23. 5.2, that results from replacing the catalyst. The replacement catalyst kinetics are given in Table 23. 2. The base case selected is the currently operating reactor (with an active volume of \(\left.7.49 \mathrm{~m}^{3}ight)\). Process output for the base case is given in the flow table in Figure 23. 6.

Figure 23.8

Figure 23.9

Figure 23.6

Table 23.2

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Cumene Production Rate (kmol/h) 110 6. 100 90 80 340 360 380 Temperature (C) New Catalyst Old Catalyst 400 420