According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.

Mass Transfer
According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.

6

10

12

8

6

10

12

8

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Mass Transfer
In a packed bed absorption column, the channelling will be noted by the

None of these

Sharp rise in pressure drop

Increase in flow rate

Sharp drop in pressure drop

None of these

Sharp rise in pressure drop

Increase in flow rate

Sharp drop in pressure drop

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Mass Transfer
Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m² and the solvent flow, rate is 400 moles of S/m². hr. The equilibrium data is represented by Y = 3X² , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is

0.25

0.5

0.9

0.7

0.25

0.5

0.9

0.7

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Mass Transfer
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas

Increases

Remains same

Decreases

Decreases linearly

Increases

Remains same

Decreases

Decreases linearly

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Mass Transfer
Which of the following is not fixed by the process requirements, in the design of absorbers?

Flow rate of the entering gas

None of these

Composition of the entering liquid

Terminal concentrations of gas stream

Flow rate of the entering gas

None of these

Composition of the entering liquid

Terminal concentrations of gas stream

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Mass Transfer
Drying operation under vacuum is carried out to

Dry those materials which have very high unbound mositure content

Dry materials having high bound moisture content

Increase drying temperature

Reduce drying temperature

Dry those materials which have very high unbound mositure content

Dry materials having high bound moisture content

Increase drying temperature

Reduce drying temperature

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Mass Transfer

Mass Transfer In a packed bed absorption column, the channelling will be noted by the

Mass Transfer With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas

Mass Transfer Which of the following is not fixed by the process requirements, in the design of absorbers?

Mass Transfer Drying operation under vacuum is carried out to

Mass Transfer
In a packed bed absorption column, the channelling will be noted by the

Mass Transfer
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas

Mass Transfer
Which of the following is not fixed by the process requirements, in the design of absorbers?

Mass Transfer
Drying operation under vacuum is carried out to