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Mass Transfer

Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

3 to 4
2.5 to 3
1.2 to 1.5
5

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

< 6:1
> 8:1
< 8 : 1
> 4 :1

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Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Increases
Decreases
Depends on the pressure of the system
Remains unchanged

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Mass Transfer
During drying of a solid, the critical moisture content increases with

Increased drying rate
Both B and C
Increased thickness of the solid
Decreased drying rate

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Mass Transfer
Absorption factor is defined as (where, S₁ = slope of the operating line S₂ = slope of the equilibrium curve)

S₁ x S₂
S₂/S₁
S₁ - S₂
S₁/S₂

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Mass Transfer
Back-trapping in a distillation column

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

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