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Mass Transfer

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

> 1
0.5
< 1
1

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as

D ∝ T1.5
D ∝ T2
D ∝ T
D ∝ T0.5

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 - Re)
Ri = Re
Ri = Re/(1 + Re)
Ri = (1 - Re)/Re

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Mass Transfer
Selectivity of the solvent used in solvent extraction should be

< 1
> 1
1

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Mass Transfer
Large scale drying of wheat is done in a __________ dryer.

Spouted bed
Fluidised bed
Vacuum rotary
Tray

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Mass Transfer
Design calculation for multiple component distillation is done by

Tray to tray calculations
Ponchon-Savarit method
Enthalpy concentration method
Mccabe-Thiele method

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