The operating cost of a distillation column at minimum reflux ratio is____________________?
Correct answer: A. Minimum
- A. Minimum
- B. Maximum
- C. Infinite
- D. Zero
Explanation
At minimum reflux, the required reflux flow and hence the reboiler and condenser duties are minimized, so the operating cost is minimum. The trade-off is an infinite number of theoretical stages, which makes the capital cost very large.
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