Solve for \(\mathrm{Q}_{\mathrm{c}}\) and \(\mathrm{Q}_{\mathrm{R}}\) in Problem 3.D1 with a process simulator.

a. Part a.

b. Part b.

Note: With Aspen Plus, use RADFRAC with an arbitrary (but large) number of stages and feed location \(=\mathrm{N} / 2\). Do calculation for \(\mathrm{D}\) by hand, and input correct values for \(\mathrm{D}\) and L/D (or \(v / \mathrm{B}\) ).

Transcribed Image Text:

A distillation column with two feeds is separating ethanol from water. The first feed is 60 wt % ethanol, has a total flow rate of 1000 kg/h, and is a mix of liquid and vapor at 81C. The second feed is 10 wt % ethanol, has a total flow rate of 500 kg/h, and is liquid at 20C. Bottoms product is 0.01 wt % ethanol, and distillate product is 85 wt % ethanol. The column operates at 1 kg/cm2 and is adiabatic. The column has a partial reboiler, which acts as an equilibrium contact, and a total condenser. The distillate and reflux are saturated liquids. Find B and D in kg/h, and find Qc and QR in kcal/h. Use data in Figure 2-4. a. External reflux ratio, Lo/D = 3.0 (mass units). b. Boilup ratio, /B = 2.5 (mass units). 100 Cool, Fro 33 800 900