Mass Transfer
Channelling is most severe

In dumped packing of regular units
In towers packed with stacked packing
In towers packed randomly with crushed solids
At very high liquid flow rate

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Mass Transfer
When the solvent dissolves very little of solute, then

Large quantity of solvent is required to extract the solute
Very small quantity of solvent is required
Solvent of low latent heat of vaporisation should be used
Solvent of low freezing point should be used

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