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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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4.7 Open Steam Heating

We now have all the tools required to solve any binary distillation problem with the graphical McCabe-Thiele procedure. As a specific example, consider the separation of methanol from water in a staged distillation column.

Example 4-4. McCabe-Thiele analysis of open steam heating

The feed is 60 mol% methanol and 40 mol% water and is input as a two-phase mixture that flashes so that VF/F = 0.3. Feed flow rate is 350 kmol/h. The column is well insulated and has a total condenser. The reflux is returned to the column as a saturated liquid. An external reflux ratio of L0/D = 3.0 is used. We desire a distillate concentration of 95 mol% methanol and a bottoms concentration of 8 mol% methanol. Instead of using a reboiler, saturated ...

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