Mass Transfer
Solvent used in extractive distillation

Forms a high boiling azeotrope
Forms a low boiling azeotrope
Does not alter the relative volatility of the original components
Is of low volatility

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Multicomponent distillation is involved
Mixture (to be separated) shows negative deviation from ideality
Relative volatility is reasonably constant
Mixture (to be separated) shows positive deviation from ideality

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