From a total mass balance around the system in Figure 2.20, Ls = Vs + B. Therefore, Ls — Vs = B. Substituting into equation (2.29) gives:
Therefore, the operating line can be easily placed on an x-y diagram by simply drawing a straight line with slope (Ls/Vs), starting at xB on the 45° line (see Figure 2.21).
C. Rectifying Section
A similar component balance around the upper part of the column above the »th tray in the rectifying section (see Figure 2.22) gives:
This is the equation of another straight line called the rectifying operating line.
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