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Mole fraction propane in liquid, xC3 (f)

Figure 7.12 (Continued) Extrapolation of test data—Example 7.2. (e) Extrapolation to a feed richer in propane, based on test interpretation in Fig. 7.12a; (f) extrapolation to a feed richer in propane, based on test interpretation in Fig. 7.12fc.

predicts 3 percent propane in the bottoms. This is only slightly higher than the propane concentration in the test data, and a lot lower than the 17 percent propane in the bottoms based on the Fig. 7.12a test data interpretation.

The above analysis demonstrates that when test data are interpreted using relative volatilities higher than actual, the resulting simulation will give optimistic predictions when extrapolated to other process conditions.

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