Basic Equations

Assuming that the composition in both streams is the same (an ideal stage).

Expressing y in terms of the separation factor and x (derived in example 23.1-2).

The minimum number of stages (N) required to do a specified purification depends on the necessary product and waste concentrations as well as on the separation factor.

Figure 1: N as a function of the separation factor (alpha) for

y_P = 0.9 and x_W = 0.1