We are now ready to put all the pieces together and solve a design distillation problem by the McCabe-Thiele method. We will do this in the following example.
Example 4-3. McCabe-Thiele method
A distillation column with a total condenser and a partial reboiler is separating an ethanol-water mixture. The feed is 20 mol% ethanol, feed rate is 1000 kmol/h, and feed temperature is 80°F. A distillate composition of 80 mol% ethanol and a bottoms composition of 2 mol% ethanol are desired. The external reflux ratio is 5/3. The reflux is returned as a saturated liquid and CMO can be assumed. Find the optimum feed plate location and the total number of equilibrium stages required. Pressure is 1 atm.
A. Define. ...