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The values of 1/fv - x) are plotted versus x in Fig. 5.16.

The values of 1/fv - x) are plotted versus x in Fig. 5.16.

Figure 5.1 {Continued) Equilibrium and l/(y-Jc) plots, Example 5.1. (b) Simple fractionation of benzene-toluene, l/(vv-:t) vs. x.

Figure 5.1 {Continued) Equilibrium and l/(y-Jc) plots, Example 5.1. (b) Simple fractionation of benzene-toluene, l/(vv-:t) vs. x.

Assuming the individual values of l/(y - *) can be joined by a straight line, the area under the curve may be approximated:

but but

= V2 b (a! + 2a2 + 2a3 + 2a4 +■ a5) - Vib [a; + 2(ct2 + 03 + 04) + 05] = Vz(0.1)[4.10 + 2(3.86 + 3.94 + 4.65) + 6.94] = 1.79

Because the still is being depleted, the value of this integral must be negative.

So, the material balance is

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