A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?
Correct answer: D. The top and bottom compositions correspond to the maximum enrichment available
- A. Composition of vapors and that of liquid do not vary throughout the column
- B. Reboiler load and condenser load are minimum
- C. The top and bottom compositions are unchanged with and without total reflux
- D. The top and bottom compositions correspond to the maximum enrichment available
Explanation
At total reflux, all condensed overhead liquid is returned and no products are withdrawn, giving the maximum theoretical enrichment for the available plates. Reboiler and condenser duties are not minimum, and the compositions generally change from those at finite reflux.
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