Mass Transfer
The minimum number of theoretical plates is required for achieving a given separation in distillation column with

Total reflux
Zero reflux ratio
No reflux
Minimum reflux ratio

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

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

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