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Mass Transfer

Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

√T and T3/2
T and T3/2
T3/2 and T
T3/2 and √T

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Mass Transfer
Total reflux in a distillation operation requires minimum

All of these
Reboiler load
Number of plates
Condenser load

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Mass Transfer
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is

Always < 1
L/G
G/L
None of these

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Mass Transfer
For gas absorption, low viscosity solvents are preferred, because of their

All of these
Rapid absorption rates
Better flow characteristics
Low pumping pressure drop

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Mass Transfer
The rate of mass transfer is not dependent upon the

Interfacial surface exposed between the phases
None of these
Both A & B
Degree of dispersion of one fluid in the other

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

(G.a)/FG
L/(FG.G)
F/(FG.a)
FG/(G.a)

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