Discussion
Three of the following belong to absorption tower design. Which belongs to adsorption?
Breakthrough curve
Height of a transfer unit
Flooding velocity
Packing type
Answer: D
Correct answer: Breakthrough curve
The breakthrough curve is the plot of outlet concentration against time for a fixed bed, and it belongs entirely to adsorption - it is what determines when the bed must be switched or regenerated. Height of a transfer unit, flooding velocity and packing type are all absorption tower quantities, describing a continuous countercurrent contactor rather than a bed that loads up and must be taken out of service.
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