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

Azeotropic mixture is to be separated and the final product is miscible with water
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
Liquids decompose, if distilled directly at atmospheric pressure

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases
Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly

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