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Mass Transfer

Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

T
√T
T⁴
T²

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Mass Transfer
Separation of two or more components of a liquid solution can not be achieved by

Fractional crystallisation
Evaporation
Liquid extraction
Absorption

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Mass Transfer
Back-trapping in a distillation column

Increases tray efficiency
Decreases tray efficiency
Reduces pressure drop
Is desirable, as it provides improved vapour-liquid contact

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Mass Transfer
Fractional solvent extraction

Employs two solvents
None of the listed here
Employs only one solvent
Results in low interfacial tension

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Mass Transfer
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

Constant molal overflow
Total reflux
All of these
Constant relative volatility

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Mass Transfer
In distillation, overhead product contains

Only one component
Two components
Only saturated liquid
Any number of components

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