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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Mass Transfer
The wetted wall tower is used to determine

M.T.C. of individual components in a liquid-liquid system
M.T.C. of liquid in liquid-gas system
The overall M.T.C. of the system
Individual mass transfer co-efficient (M.T.C.) in gaseous system

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