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Mass Transfer

Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Danckwerts
Toor and Marchello
Kissinevskii
Higbie

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Mass Transfer
For a binary mixture with low relative volatility,

Use molecular distillation
Use high pressure distillation
An azeotrope may be formed during distillation
Use steam distillation

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

1
100
5
10

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Mass Transfer
Flooding in a column results due to

High pressure drop
High temperature
Low pressure drop
Low velocity of the liquid

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Mass Transfer
The most economical range of absorption factor is

2.5 to 3
1.25 to 2
5 to 10
2 to 2.5

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Mass Transfer
It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).

94 min
15 min
51 min
71 min

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