Optimum reflux ratio in a continuous distillation column is determined by the__________________?
Correct answer: D. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
- A. Maximum permissible vapour velocity
- B. Flooding limit of the column
- C. None of these
- D. Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
Explanation
The economic optimum reflux is where annual fixed cost and operating costs are balanced. Increasing reflux raises steam and cooling-water costs, whereas low reflux requires a larger column and more trays, so total cost is minimized at an intermediate value.
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