Water containing \(1.6 \mathrm{~mol} \% \mathrm{n}\)-butanol is sent at a rate of \(75.0 \mathrm{kmol} / \mathrm{h}\) to a two-column distillation system similar to Figure 8-5A. The feed is a saturated liquid. Pressure is \(1.0 \mathrm{~atm}\). The column with the feed has a partial reboiler and a total condenser connected to a liquid-liquid separator. The denser aqueous phase (point \(\alpha\) ) containing \(2.5 \mathrm{~mol} \% \mathrm{n}-\) butanol is returned as reflux to the column that receives the feed. Bottoms from this column (the water product) contains \(0.2 \mathrm{~mol} \% \mathrm{n}\)-butanol. The organic phase from the settler containing \(57.3 \mathrm{~mol} \%\) water is sent to a stripper that has a partial reboiler. Bottoms from this stripper is the nbutanol product and is \(4.0 \mathrm{~mol} \%\) water. The vapor distillate from this column has \(\mathrm{y}_{\text {dist,water }}=0.68\) and is condensed and then sent to liquidliquid separator.
Figure 8-5A

a. Sketch the flowsheet.
b. Find the flow rates of the two products.
stage, and the total number of stages needed for the column with the feed (produces water product).
d. For the stripping column, find \(\ulcorner, \mathrm{v}\), and the number of stages needed.
e. For liquid-liquid separator, show that total flow in = total flow out and that water flow in \(=\) water flow out.

Use diagrams with different scales for parts \(\mathrm{c}\) and \(\mathrm{d}\).

Transcribed Image Text:

V1,strip, YB.1.strip Separator 2 X8,bot strip Water product A Yw.1.complete V1.complete -F.z.q w.bot.complete column n-butanol product