In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the_______________?
Correct answer: D. Liquid gradient on the tray
- A. Small downcomer liquid seal
- B. Lower skirt clearance
- C. Lower static submergence
- D. Liquid gradient on the tray
Explanation
A liquid-level gradient across a tray produces different liquid heads over the bubble caps, so the vapour does not divide equally among them. This hydraulic imbalance is the primary cause of nonuniform bubble-cap vapour distribution.
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