K

0.02 MeOH 0.98 BuOH

Figure 10.9 Vapor sidestream.

0.02 MeOH 0.98 BuOH

Figure 10.9 Vapor sidestream.

boiling point of n-butanol is 390.8 K, compared to 337.7 K for MeOH. This produces a relative volatility of ~4.4, so a vapor sidestream product with only 1 mol% BuOH can be produced with a reflux ratio of 1.07. The composition of the liquid on the sidestream drawoff tray is 4.3 mol% BuOH.

The column has 51 stages, and the feed is introduced on stage 21. The vapor sidestream is withdrawn from stage 41. The column operates at 11 atm. Figure 10.9 gives the flowsheet with stream conditions and design parameters for this vapor sidestream column with a ternary feedstream of composition 45 mol% DME, 50 mol% MeOH, and 5 mol% BuOH. The column diameter is 0.635 m. The reboiler heat input is 1.075 MW.

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