The suitable evaporator for concentration of foaming liquids is a ______________________ evaporator?
Correct answer: A. Long tube
- A. Long tube
- B. Short tube
- C. Vacuum
- D. Falling film
Explanation
Long-tube evaporators are suitable for foaming liquids because the liquid and vapour move rapidly through long vertical tubes, limiting foam accumulation. Short-tube units are more often selected for crystallising or heavily scaling solutions.
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