Figure 5.27 Effect of z0AA) on composition profiles.
Increasing the number of reactive trays NRX improved energy consumption in the ternary system without inerts. When inerts are present, the same result is observed, as shown in Figure 5.28. Vapor boilup decreases as more reactive trays are added.
In addition, the loss of reactant decreases as NRX increases. Both the amount of reactant A fed and its concentration in the distillate decrease as NRX increases. Thus, there is a double benefit for having more reactive trays in the system with inerts. As we will demonstrate in Part IV of this book, there are additional dynamic benefits for having numerous reactive trays.
Temperature profiles are quite similar for all values of NRX, as demonstrated in Figure 5.29.
The final parameter explored in this chapter is the number of trays used in the two separation sections. In Chapter 2 we found that increasing the number of stripping and rectifying trays decreases energy consumption in the quaternary system. In Section 5.1.7 in this chapter we found that there is an optimum number of stripping trays in the ternary system without inerts. What are the effects for the ternary system with inerts?
Figure 5.30 provides the answer to this question. The base case value is NR = NS = 5. When this number is increased, vapor boilup decreases but only slightly. However, if
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