Mass Transfer
For gas absorption, low viscosity solvents are preferred, because of their

All of these
Rapid absorption rates
Low pumping pressure drop
Better flow characteristics

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Mass Transfer
Steam distillation is used to

Avoid thermal decomposition of a component
Increase the efficiency of separation
Reduce the number of plates
Increase the total pressure of distillation

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Mass Transfer
Plate efficiency

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

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

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

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