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Mass Transfer

Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P = P
P
P >>P
P < P

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Mass Transfer
In most of the vacuum crystalliser, vacuum is generally produced by means of a

Steam jet ejector with a barometric condenser
None of these
Compressed air jet
Suction pump

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Mass Transfer
Smoke is an example of

Gas dispersed in liquid
Solid dispersed in liquid
Liquid dispersed in gas
Solid dispersed in gas

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

> 4 :1
> 8:1
< 8 : 1
< 6:1

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Mass Transfer
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

Percolation
Decoction
Elutriation or elution
None of these

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Mass Transfer
Back-trapping in a distillation column

Increases tray efficiency
Is desirable, as it provides improved vapour-liquid contact
Reduces pressure drop
Decreases tray efficiency

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