The extraction is represented by countercurrent multistage extraction system, which is modelled as a cascade of equilibrium stages.
The equilibrium condition is satisfied by the use of an arbitrarily high value for K to force conditions towards equilibrium.
Following an initial transient condition, the extractor will achieve a steady state operating condition, in which the outlet concentrations then remain constant with respect to time.
The constant K considered, contains the mass transfer coefficient, the specific interfacial area, and the total liquid volume.
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