Mass Transfer
The rate of solid-liquid extraction is limited by the

Diffusion of the solute through the solvent in the pores to the outside of the particle
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
Phase change of the solute as it dissolves in the solvent
All of these

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Mass Transfer
Flights in a rotary dryer are provided to

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

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