Mass Transfer
Desulphurisation of petrol is done in a

Plate type extraction column
Rotating disc extractor
Packed extraction column
Bollman extractor

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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
All of these
Phase change of the solute as it dissolves in the solvent

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