Mass Transfer
Antibiotics are best handled in a

Pulsed column extractor
Sieve tray contractor
Rotating disc contactor
Podbielniak extractor

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Mass Transfer
Plate efficiency

Increases due to weeping and dumping of liquid
Increases due to foaming
Is a function of the mass transfer between liquid and vapour
Increases due to liquid entrainment

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

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

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