Question: A distillation column with two equilibrium stages and a partial reboiler (three equilibrium contacts) is separating methanol and water. The column has a total condenser.

A distillation column with two equilibrium stages and a partial reboiler (three equilibrium contacts) is separating methanol and water. The column has a total condenser. Feed, a 45 mol% methanol mixture, enters the column on the second stage below the condenser. Feed rate is 150 mol/h. The feed is a subcooled liquid. To heat 2 moles of feed to the saturated liquid temperature, 1 mole of vapor must condense at the feed stage. A distillate concentration of 80 mol% methanol is desired. Reflux is a saturated liquid, and CMO can be assumed. An external reflux ratio of L/D = 2.0 is used. Find the resulting bottoms concentration xB. Data are in Table 2-7.

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