Mass Transfer
__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

Hexane
Butyl acetate
Benzol
Furfural

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Mass Transfer
Flights in a rotary dryer are provided to

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

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