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Figure 6.12a gives results for changes in the propane composition of the feed. Using the SVD-recommended stage 8 or stage 30 holds both the distillate and bottoms impurities close to their specified values of 2 mol%.

The upper graphs in Figure 6.12b give results for changes in the isopentane composition of the feed. The lower graphs in Figure 6.12b give results for changes in the ethane composition of the feed. Using stage 8 or stage 30 keeps both the distillate and the bottoms impurities quite close to or below their specifications.

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