As the reflux ratio in a distillation column is increased from the minimum, the______________________?
Correct answer: C. Total cost first decreases and then increases
- A. Slope of the operating line in stripping section decreases
- B. Number of plates decreases very slowly first and then more and more rapidly
- C. Total cost first decreases and then increases
- D. Liquid flow increases while the vapor flow decreases for a system
Explanation
Increasing reflux reduces the number of stages required, but it increases internal flows and operating cost. The total annualized cost therefore commonly falls at first and then rises, giving an optimum reflux ratio.
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