In a distillation column, the minimum residence time for liquid in the downspout is about ______________ seconds?
Correct answer: B. 8
- A. 1
- B. 8
- C. 80
- D. 180
Explanation
A liquid residence time of about 8 seconds in the downcomer allows entrained vapour to disengage and provides stable liquid transfer to the tray below. Too short a time can cause vapour carry-under and poor tray performance.
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