Limiting nonkey composition

Estimation of the limiting nonkey composition is based on Jenny s approximation (20). Accordingly, KiX) the equilibrium ratio the li t key, is equal to L lV in the stripping section zone of constant heavy nonkey mole fraction. Similar, the eqpiilibrium ratio of the heavy... 

Limiting compositions. In order to apply Eqs. (2.46) to (2.49), the limiting compositions of the nonkeys are determined. The limiting composition of each nonkey is the composition of the component in the zone where it has constant mole fraction. 

For the rectifying section, it is assumed that light nonkeys are at their limiting compositions and that heavy nonkeys are absent, For the stripping section, it is assumed that heavy nonkeys are at their limiting composition and that light nonkeys are absent. Equations (2,46) to (2,49) can therefore be written for the zone of constant nonkey mole fraction in the rectifying section as follows ... 

---