Appropriate Placement of Reactors

We have seen in Chapter 16 how the pinch takes on fundamental significance in improving heat integration. Exploring the consequence of placing reactors in different locations relative to the pinch is illustrated in Figures 21-76A and B. Figure 21-77 shows a process represented simply as a heat sink and heat source divided by the pinch. Figure 21-76A shows the process with an exothermic reactor integrated above the pinch. The minimum hot utility can be reduced by the heat released by reaction QREACT. Alternatively, Figure 21-76B shows an exothermic reactor integrated below the pinch. Although the heat is being recovered, it is fed into part of the process which is a heat source. The hot utility requirement cannot ...

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