Mass Transfer
In case of a desorber (stripper), the

Operating line always lies above the equilibrium curve
Operating line always lies below the equilibrium curve
Temperature remains unaffected
Temperature always increases

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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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