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

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2.2 Form and Sources of Equilibrium Data

Equilibrium data are required to understand and design the separations in Chapters 1 to 16 and 18. In principle, we can always experimentally determine the VLE data we require. For a simple experiment, we could take a chamber similar to Figure 1-2, fill it with the chemicals of interest, and at different pressures and temperatures, allow the liquid and vapor sufficient time to come to equilibrium and then take samples of liquid and vapor and analyze them. If we are very careful, we can obtain reliable equilibrium data. In practice, the measurement is fairly difficult and a variety of special equilibrium stills have been developed. Marsh (1978) and Van Ness and Abbott (1982, Section 6-7) briefly review ...

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