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#### A. Discussion Problems

A1. Why is the still pot in Figure 9-2B much larger than the column?

A2. In the derivation of the Rayleigh equation:

a. In Eq. (9-4), why do we have −xD dW instead of −xD dD?

b. In Eq. (9-4), why is the left-hand side −xD dW instead of −d(xDW)?

A3. Explain how the graphical integration shown in Figures 9-3 and 9-5 could be done numerically on a computer.

A4. Suppose you have two feeds containing methanol and water that you want to batch distill. One feed is 60 mol% methanol, and the other is 32 mol% methanol. How do you do the batch distillation to obtain the largest amount of distillate of given mole fraction? N is constant.

a. Mix the two feeds together and batch distill.

b. Start the batch with the feed with higher methanol ...

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