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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

D2
D
D0.5
1/D

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Mass Transfer
Flash distillation is suitable for the separation of components

Having very wide boiling points
Which form maximum boiling azeotrope
Which form minimum boiling azeotrope
Having very close boiling points

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Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Low reflux ratio
Small cross-section column
Less number of trays
High reflux ratio

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Mass Transfer
In physical terms, Schmidt number means

Mass diffusivity/thermal diffusivity
Thermal diffusivity/momentum diffusivity
Thermal diffusivity/mass diffusivity
Momentum diffusivity/mass diffusivity

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Mass Transfer
Desirable value of absorption factor in an absorber is

0.5
1
> 1
< 1

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

Vacuum gas oil
HCl
K₂CO₃
Ethanolamine

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