A feed of 500 kmol/h of methanol and ethanol are to be distilled at 2 bar. The feed is 60 mol% methanol, and the feed is 75% liquid and 25% vapor in equilibrium. The desired outlet compositions are 90 mol% methanol in the distillate and 95 mol% ethanol in the bottoms.

1. Determine the flowrates of the distillate and the bottoms (kmol/h).

2. Calculate all internal flows for a reflux ratio of 3.

3. Determine the diameter of a sieve tray tower with 24-in tray spacing at 70% of flooding with an active tray area of 89%. Design for the top and bottom sections. If the larger diameter is used for the entire column, how will the other section perform? There are 19 equilibrium stages with the feed on Stage 7.

Methanol heat of vaporization = 40.5 kJ/mol

Ethanol heat of vaporization = 38.3 kJ/mol

Methanol specific gravity = 0.75

Ethanol specific gravity = 0.75

Transcribed Image Text:

Data: For methanol, log10p* (mm Hg) = 8.07240 - For ethanol, log10p* (mm Hg) = 8.21330 - 1574.99 T(C) +238.87 1652.050 T(C) +231.480