Mass Transfer
Low viscosity absorbent is preferred for reasons of

Improved flooding characteristics
All of these
Low pressure drop on pumping
Rapid absorption rates and good heat transfer characteristics

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Mass Transfer
Flights in a rotary dryer are provided to

None of these
Reduce the residence time of solid
Increase the residence time of the solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas

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