The model consists of 30 effective plates.
Each plate corresponds to certain amount of the exchanger. The material in each plate is surrounded by the solution. Two single-charged ions A and B are exchanged.
A batch equilibrium distribution of ions between the exchanger and solution is calculated for each effective plate in each step.
The column performance is represented by a series of discrete actions (shifts or discrete movements of the solution). At the step number n, each effective plate is equilibrated with surrounding solution. A solution shift is considered after the equilibration, i.e., at step number n+1, the solution moves from one plate to the next one along the column. After the shift, equilibria are established again.
Concluding: continuous flow of the solution is modelled as a number of discrete shifts along a number of batch ion exchange reactors (effective plates).
K is the ion exchange constant, see equation (11.1) in the book.
Capacity is the total capacity of one effective plate.
Volume is volume of the solution surrounding one effective plate.
[A] is concentration of the ion A in the feed solution.
[B] is concentration of the ion B in the feed solution.
Graphical representation is:
Left column represents the ratio between concentrations of A (red) and
B (blue) ions in the solution located between the exchanger beads.
Right column represents the ratio between contents of A (red) and B (blue) ions in the exchanger.
Each square represents one effective plate in the column.
The square at top-left corner represents the feed solution composition.
The square at bottom-left corner represents the effluent.
One step can be executed pressing the button [+1 step]. Several steps at once can be executed pressing the button [+ steps]. The number of steps to perform can be introduced in the text field above the button. To start a new experiment, change the characteristics and press the button [reset]. The column will be reset to A form equilibrated with solution containing only A.