Transport of Concentrated Species 2 (tcs2)
1
In the Model Builder window, under Component 2 (comp2)  click on the Transport of Concentrated Species 2 (tcs2)  interface.
1
In the Settings window for Transport of Concentrated Species 2 (tcs2) , locate the Species section.
2
From the From mass constraint list, choose wWl.
Transport Properties 1
1
In the Model Builder window, click Species Molar Masses 1 under Component 2 (comp2)  > Transport of Concentrated Species 2 (tcs2) .
2
Locate the Molar Mass section.
3
From the MwWl list, choose Molar mass (chem/W).
4
From the MwEl list, choose Molar mass (chem/E).
Now, set the liquid velocity for the rectifying section. The minus indicates that the liquid flows from the top to the bottom of the column.
5
Click the Transport Properties 1  node.
6
In the Settings window for Transport Properties, locate the Convection section.
7
Specify the u vector as -uLr in the x direction.
8
In the table for Maxwell-Stefan diffusivities, select User defined and set the diffusion coefficient to 1e-20[m^2/s].
Initial Values 1
1
In the Model Builder window, expand the Component 2 (comp2)  > Transport of Concentrated Species 2 (tcs2)  > Initial Values 1.
2
In the Settings window for Initial Values, locate the Initial Values section.
3
In the w0,wEl text field, type wf.
Transport Properties 2
1
In the Model Builder window, under Component 2 (comp2)  > Transport of Concentrated Species 2 (tcs2)  right-click Transport Properties 1 and choose Duplicate .
2
Select Domain 1 only.
Now, set the liquid velocity for stripping section. The minus indicates that the liquid flow from the top to the bottom of the column.
3
In the Settings window for Transport Properties, locate the Convection section.
4
Specify the u vector as -uLs in the x direction.
Add the distillate mass fraction of the more volatile species (ethanol) as a boundary condition for the rectifying section.
Mass Fraction 1
1
In the Physics toolbar, click Boundaries  and choose Mass Fraction .
2
Select Boundary 3 only (the point furthest to the right).
3
In the Settings window for Mass Fraction, locate the Mass Fraction section.
4
Select the Species wEl checkbox, and type wd in the ω0,wEl text field.
Now, add the liquid feed mass fraction of the more volatile species (ethanol) at the injection point.
Mass Fraction 2
1
In the Physics toolbar, click Boundaries  and choose Mass Fraction .
2
Select Boundary 2 only (the intermediate point found near the left endpoint).
3
In the Settings window for Mass Fraction, locate the Mass Fraction section.
4
Select the Species wEl checkbox and type wf in the ω0,wEl text field.
Outflow 1
1
In the Physics toolbar, click Boundaries  and choose Outflow .
2
Select Boundary 1 only (the leftmost point).
Reaction Sources 1
1
In the Physics toolbar, click Domains  and choose Reaction Sources .
2
In the Settings window for Reaction Sources, locate the Reactions section.
3
Select the Mass transfer to other phases checkbox.
4
In the RwEl text field, type tcs.M_wE*Kya*(ym1-ye1).
5
In the RwWl text field, type -tcs.M_wW*Kya*(ym1-ye1).
6
Click in the Graphics window and then press Ctrl+A to select all domains.