A ternary mixture of methanol, ethanol, and water is distilled in a sieve-tray column to obtain a
Question:
A ternary mixture of methanol, ethanol, and water is distilled in a sieve-tray column to obtain a distillate with not more than 0.01 mol% water. The feed to the column is as follows:
For a distillate rate of 93.10 kmol/h, a reflux ratio of 1.2, a condenser outlet pressure of 1.0 atm, and a top-tray pressure of 1.1 atm, determine using the UNIFAC method for activity coefficients:
(a) The number of equilibrium stages required and the corresponding split, if the feed enters at the optimal stage.
(b) The number of actual trays required if the column operates at about 85% of flooding and the feed is introduced to the optimal tray. Compare the split to that in part (a). In addition, the component Murphree vapor-tray efficiencies. What do you conclude about the two methods ofcalculations?
Step by Step Answer:
The ChemSep method was applied to both parts using the ideal gas law Antoine vapor pressure and excess enthalpy with UNIFAC A column bottoms pressure ...View the full answer
