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

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6.7 Discussion

All of the methods for solving multicomponent distillation and absorption problems have weaknesses. The bubble-point method works well for narrow-boiling feeds, but is inherently unstable for wide boiling feeds. The sum-rates method (Chapter 12) works well for wide-boiling feeds such as most absorbers but is unstable for narrow-boiling feeds. The Naphtali-Sandholm approach often works well for both narrow- and wide-boiling feeds, but Newtonian methods are notorious for diverging for nonlinear problems if the first guess is not close to the final answer. Since distillation problems can be extremely nonlinear, the first guess can be very important for all of these methods. If a good first guess is difficult to find, try finding ...

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