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

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

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Mass Transfer
Steam distillation is not recommended to be used, if the

Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature
Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
Azeotropic mixture is to be separated and the final product is miscible with water
Liquids decompose, if distilled directly at atmospheric pressure

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