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Mass Transfer

Mass Transfer
Danckwerts developed the __________ theory.

Surface renewal
Penetration
Film
None of these

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

10
8
9
1

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Mass Transfer
With increase in pressure, the relative volatility for a binary system

Remains same
Decreases
Either A or B, depends on the system
Increases

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Mass Transfer
Perforated plate towers are unique for solvent extraction because, they provide

Repeated coalescence & redispersion of the drop phase
Better contact of the phase
None of these
Higher contact area

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

A total condenser is used
An azeotrope forms
The latent heat of vaporisation of the more and less volatile components are greatly different
Saturated feed is not used

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Mass Transfer
The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________

1
3
4
2

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