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In equimolar counter diffusion for every mole of one component diffusing in one direction there is , by definition, one mole of the other component
In equimolar counter diffusion for every mole of one component diffusing in one direction there is
by definition, one mole of the other component diffusing in the opposite direction.
In this problem we will consider mass transfer by diffusion in the vertical column of constant cross
section shape of the crosssection is not significant shown in Figure Q below. The column is
open at both ends. Inside the column there are two components A and B Gas streams containing
both components A and flow across each of the two open ends of the column at the top and the
bottom. The concentration of in the lower stream is greater than the concentration of in the
upper stream giving rise to a concentration difference, which drives the mass transfer of A from the
bottom to the top of the column. For equimolar counter diffusion, we have in the column,
where and are the molar fluxes of the components A and B respectively in the vertical
direction in the column, relative to stationary coordinates.
The geometry has been chosen so that there is mass transfer in one direction only, the direction
and Cartesian coordinates can be used. Use a differential control volume inside the column and
a develop the mass balance equation in molar terms for components A and ;
b derive an expression for the molar fluxes and relative to stationary coordinates;
c derive the concentration profiles of components A and along the column. Plot the profiles in a
graph with concentration in the axis and vertical distance in the axis;
d compare the molar flux of in this case to that for diffusion through a stagnant film.
You can assume that the gases are ideal.
Figure Q : Schematic of the vertical column where the equimolar counter diffusion of gases A and B takes place.
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