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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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8.5.2 Residue Curves

We could do all of our calculations with distillation curves at total and finite reflux ratios; however, these curves depend to some extent on the distillation system. It is convenient to use a thermodynamically based curve that does not depend on the number of stages. A residue curve is generated by putting a mixture in a still pot and boiling it without reflux until the pot runs dry and only the residue remains. This is a simple batch distillation that will be discussed in more detail in Chapter 9. The plot of the changing mole fracs on a triangular diagram is the residue curve. It will be similar but not identical to the distillation curves shown in Figures 8-7 and 8-8. The differences between distillation curves and residue ...

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