K

D = 12.6 mol/s *D, A = 0.0417 *b,B = 0.0083 *D,C = 0.9500 *D,D = 0.0000

B = 12.6 mol/s *B,A = 0.0083 xb'b = 0.0417 *B,C = 0.0000

Tray

Tray

Figure 10.2 Steady-state composition and temperature profiles.

Tray

Figure 10.2 Steady-state composition and temperature profiles.

The column has a total of 17 trays: 5 stripping trays, 7 reactive trays, and 5 rectifying trays. The column pressure is 8.5 bar, and the reflux ratio is 2.65. Figure 10.2 gives the steady-state composition and temperature profiles.

Figure 10.3 shows the effects of the number of reactive trays on the TAC for the pressure P = 8.5 bar with the number of separation stages NR = NS = 5. The optimum number of reactive trays balances capital and energy costs. Designs that incorporate more reactive trays suffer an economic penalty. However, as demonstrated later in this chapter, these designs may result in greatly improved dynamic controllability.

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