In the downcomer of a distillation column, the minimum recommended residence time is about _______________ seconds?
Correct answer: B. 5
- A. 2.5
- B. 5
- C. 12.5
- D. 17.5
Explanation
A downcomer normally requires about 5 seconds of residence time to disengage entrained vapour and pass liquid smoothly to the tray below. Too short a time increases the risk of backup and flooding.
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