Question: An extractive distillation system is separating ethanol from water using ethylene glycol as solvent. The makeup solvent is pure ethylene glycol. In Figure 8-14, ethanol

An extractive distillation system is separating ethanol from water using ethylene glycol as solvent. The makeup solvent is pure ethylene glycol. In Figure 8-14, ethanol is A product, and water is B product. The feed is 20.0 $\mathrm{mol} \%$ ethanol, and the remainder is water with flow rate of $100.0 \mathrm{kmol} / \mathrm{h}$. The ethanol product (column 1 distillate) is $99.70 \mathrm{~mol} \%$ ethanol, 0.02 $\mathrm{mol} \%$ ethylene glycol, and the remainder is water. The water product (column 2 distillate) is $99.90 \mathrm{~mol} \%$ water, $0.035 \mathrm{~mol} \%$ ethylene glycol, and the remainder is ethanol.

Figure 8-14

A Product Feed- Solvent Recycle Cooler B Make up Solvent 2 B

a. Find the flow rates of the makeup solvent and of the ethanol and water products.
b. Why would a separation flowsheet that uses a normal distillation column to preconcentrate the feed be chosen instead of this separation?

A Product Feed- Solvent Recycle Cooler B Make up Solvent 2 B Product

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