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Mass Transfer

Mass Transfer
Selectivity of the solvent used in solvent extraction should be

1
< 1
> 1

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

All of the listed here
High maintenance cost
High labour cost & low heat economy
Non-uniform & low production rate

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Mass Transfer
Which of the following is an undesirable property in a tower packing?

Large free cross-section
Low weight per unit volume
Large weight of liquid retained
Large surface per unit volume

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Mass Transfer
Molecular seives are porous

Synthetic zeolites crystals/metal alumino-silicates
Silica
Alumina
None of these

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.83
Re0.33
Re
Re0.53

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Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Minimise the overall pressure drop
Avoid flooding
Reduce liquid hold up
Avoid channeling

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