# A saturated vapor feed at (1000.0 mathrm{kmol} / mathrm{h}) of methanol ((5.0 mathrm{~mol} %)) and water ((95.0

## Question:

A saturated vapor feed at $$1000.0 \mathrm{kmol} / \mathrm{h}$$ of methanol $$(5.0 \mathrm{~mol} \%)$$ and water $$(95.0 \mathrm{~mol} \%)$$ is fed to a distillation column with 18 stages plus a kettle reboiler and a total condenser $$(\mathrm{N}=20$$ in Aspen Plus notation). Use the NRTL VLE correlation. Operate at $$80 \%$$ of flooding using Fair's diameter calculation method and tray spacing $$=0.4572 \mathrm{~m}$$. Use an external reflux ratio of 24 . Pressure is $$1.0 \mathrm{~atm}$$. Calculate the optimum feed plate location, product purities, $$\mathrm{Q}_{\mathrm{c}}$$ and $$\mathrm{Q}_{\mathrm{R}}$$, and the column diameters at different locations for the base case. Then determine which of the methods in Figure 10-17 will do the best job of balancing the diameters and reducing the column volume with constant product purities, $$Q_{c}$$ and $$Q_{R}$$. Report the results for your system with the largest volume reduction.

Figure 10-17

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