Mass Transfer
In most of the vacuum crystalliser, vacuum is generally produced by means of a

Compressed air jet
Steam jet ejector with a barometric condenser
None of these
Suction pump

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

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