Mass Transfer - Chemical Engineering Questions and Answers

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The rate of solid-liquid extraction is limited by the

phase change of the solute as it dissolves in the solvent.

diffusion of the solute through the solvent in the pores to the outside of the particle.

diffusion of the solute from the solution in contact with the particle to the main bulk of the solution.

all 'a', 'b' & 'c'.

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Raoult's law applies to the

all liquid solutions

non-ideal solution only.

non-volatile solute.

solvents.

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In distillation columns, the number of bubble caps per tray primarily depends upon the

allowable liquid velocity.

allowable gas velocity.

allowable gas and liquid velocities.

feed composition.

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In distillation, overhead product contains

only one component

two components

any number of components

only saturated liquid

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

increases.

decreases.

remains same.

either (a) or (b), depends on the system.

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Low viscosity absorbent is preferred for reasons of

rapid absorption rates and good heat transfer characteristics.

improved flooding characteristics.

low pressure drop on pumping.

all (a), (b) and (c).

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

K ∝ D

K ∝D

K ∝ D^1.5

K ∝ D²