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Wcat,bot - 1 Wcat.RD

Fss = 1500 kmol/h

Wcat,bot - 1 Wcat.RD

Fss = 1500 kmol/h

Figure 16.30 (a) Effect of side stream return tray (NSSr) on TACs and (b) tradeoff of separator cost (capital and operating costs) and reactor cost.

Figure 16.30 (a) Effect of side stream return tray (NSSr) on TACs and (b) tradeoff of separator cost (capital and operating costs) and reactor cost.

Thus, the design variables include catalyst holdup Wcat,bot in the column base, side stream flowrate FSS (side reactor feed flowrate), the percentage of equilibrium conversion (%Xeq) in the side reactor, and side stream (reactor effluent) return tray NSS,r, as shown in Figure 16.29. We assume that the reactor is an adiabatic plug flow reactor with an aspect ratio (length/diameter) of 5. A systematic design procedure is proposed to find the optimal configuration. All of the simulations are carried out in Aspen Plus using the RadFrac and RPlug modules. Given the production rate and product specifications, the design steps are the following:

1. Set the total number of trays equal to that of the reactive distillation (NT = 19).

2. Withdraw the side stream from the bottom of the distillation column (NSS,w = 0).

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