If one additional assumption can be made, the Kremser equation can be used for dilute extraction of single or multicomponent systems.
7. Equilibrium is linear.
In this case, equilibrium has the form
The dilute extraction model now satisfies all the assumptions used to derive the Kremser equations in Chapter 12, so they can be used directly. Since we have used different symbols for flow rates, we replace L/V with R/E. Then Eq. (12-12) becomes
while if R/(mE) ≠ 1, Eqs. (12-21) (inverted) and ...