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Mass Transfer

Mass Transfer
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Spray
Bubble
Packed
Tray

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Mass Transfer
In batch distillation with constant reflux, overhead product composition __________ with time.

May increase on decrease, depends on the system
Decreases
Does not vary
Increases

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Mass Transfer
Use of packed towers for distillation is generally limited to the

Vacuum distillation
Multicomponent distillation
Small sizes
High pressure operation

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Mass Transfer
For a binary mixture with low relative volatility,

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

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Mass Transfer
In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)

Both A & B
Neither A nor B
Parallel
Straight

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Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

0.1
1
10
0.01

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