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Mass Transfer

Mass Transfer
Langmuir equation is associated with

Multicomponent absorption
Leaching
Adsorption
Steam distillation

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Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Pressure drop in the column is very high
Both operating and equilibrium lines are parallel
Operating line lies below the equilibrium line
Operating line lies above the equilibrium line

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Mass Transfer
Low viscosity absorbent is preferred for reasons of

Low pressure drop on pumping
All of these
Rapid absorption rates and good heat transfer characteristics
Improved flooding characteristics

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Mass Transfer
Drying operation under vacuum is carried out to

Increase drying temperature
Dry those materials which have very high unbound mositure content
Reduce drying temperature
Dry materials having high bound moisture content

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Mass Transfer
Weeping in a distillation column

Provides large interfacial surface for mass transfer
Results due to very low gas velocity
Increases tray efficiency
Results due to very high gas velocity

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

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

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