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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ D
K ∝ D2
K ∝ D1.5
K ∝ √D

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Mass Transfer
Mass transfer co-efficient is defined as

Co-efficient = Flux/concentration difference
None of the listed here
Flux=concentration difference/co-effi-cient
Flux = Co-efficient/concentration difference

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Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

10-5 to 10-6
> 1
0.01
0.1

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Mass Transfer
Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.

None of the listed here
Between 100 and 210
At < 100
At > 210.6

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Mass Transfer
__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

Butyl acetate
Hexane
Furfural
Benzol

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

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

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