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

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

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Mass Transfer
McCabe-Thiele method

Can use any type of units
Is more accurate than Ponchan-Savarit method
Uses molal units for material and energy balance
Uses weight fractions to express liquid and vapour composition

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