Which one of the following cannot be regarded as a demerit of falling film evaporator?

Which one of the following cannot be regarded as a demerit of falling film evaporator? Correct Answer Large product holdup

The demerits of falling film evaporators can be stated as- i. High headroom requirement ii. Generally not suited for corrosive or scaling materials iii. Requires recirculation Whereas the falling film evaporator with its falling area has very low product holdup.
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