Back-trapping in a distillation column results due to_________________?
Correct answer: D. Excessive liquid gradient over the tray
- A. Low gas velocity
- B. High gas velocity
- C. Low reflux ratio
- D. Excessive liquid gradient over the tray
Explanation
Back-trapping occurs when an excessive liquid-level gradient develops across the tray, causing liquid to move backward toward the inlet. Low gas velocity and low reflux do not produce this hydraulic condition.
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