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Mass Transfer

Mass Transfer
In a binary system, separation is very efficient, when the relative volatility is

1
< 1
> 1
0.5

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P = P
P < P
P
P >>P

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Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

600
1
3.97
0.24

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Mass Transfer
In extractive distillation, solvent is

Added to alter the relative volatility of the mixture
Present in overhead stream
Of high volatility
Of high viscosity to give high tray efficiency

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Mass Transfer
As the reflux ratio decreases, the

Column diameter increases
None of these
Separation becomes more efficient
Number of plates increases

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Mass Transfer
In the constant rate period of the rate of drying curve for batch drying,

Surface evaporation of unbound moisture occurs
Rate of drying decreases abruptly
Cracks develop on the surface of the solid
None of these

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