Discussion
Consider the following statements about a two-product distillation column.
1. Overall and component balances give two independent equations for a binary.
2. Specifying the feed and both product compositions fixes the two flows.
3. The energy balance is needed to find the product flow rates.
Answer: D
The first two are correct and are the basis of the familiar lever rule. The third is wrong for the flows themselves, since the material balances alone determine them; the energy balance is needed for the reboiler and condenser duties.
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