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Mass Transfer

Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
2.5
0.0025
1.25

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Mass Transfer
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)

T vs . P
Log P vs. log T
Log P vs . T
P vs . log T

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Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

√T and T3/2
T3/2 and √T
T and T3/2
T3/2 and T

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Mass Transfer
Under conditions of flooding in packed tower, the gas pressure drop

Increases rapidly
Remains constant
Decreases rapidly
Is maximum

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Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Interface
Liquid phase
Gas phase
All of these

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Mass Transfer
H₂S present in naphtha reformed gas is removed by absorbing with

K₂CO₃
Vacuum gas oil
HCl
Ethanolamine

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