Mass Transfer
Bollman extractor

Is a centrifugal extractor
Is a static bed leaching equipment
Is used for extraction of oil from oilseed
Employs only counter-current extraction

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

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