For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?
Correct answer: B. Backward
- A. Forward
- B. Backward
- C. Parallel
- D. None of these
Explanation
Backward feeding places the most concentrated and viscous solution in the hottest effect, where its viscosity is lower and heat transfer is easier. Hence it is preferred for viscous solutions.
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