Priming in a distillation column_________________?
Correct answer: C. Is characterised by the presence of foam throughout the space between trays
- A. Results from very low gas velocity
- B. Is desirable from point efficiency consideration
- C. Is characterised by the presence of foam throughout the space between trays
- D. Reduces the overall pressure drop
Explanation
Priming occurs when vapour velocity becomes excessive, causing liquid to be carried upward and foam to fill the space between trays. It increases pressure drop and reduces column performance, so the foam description identifies it.
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