Phase equilibria in mixtures of polar and nonpolar compounds: Derived thermodynamic quantities for alcohols and hydrocarbon
✍ Scribed by Cline Black
- Publisher
- American Institute of Chemical Engineers
- Year
- 1959
- Tongue
- English
- Weight
- 892 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0001-1541
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✦ Synopsis
Abstract
The properties of vapor mixtures and liquid solutions which determine phase equilibria are of special importance in separation processes. They include the vapor‐phase imperfections; the liquid‐phase activity coefficents; and the excess heat, entropy, and free energy of mixing.
Correlation of these properties in nonpolar mixtures is relatively simple, but in mixtures of polar and nonpolar compounds the molecular interactions lead to more complex relations. Semiempirical relations reported earlier (3, 4) have been used to calculate the vapor imperfections and to correlate the liquid‐phase activity coefficients.
Temperature variations of the activity coefficients can reflect the true heat and entropy effects in solution if sufficient vapor‐liquid equilibria are available for a careful and consistent treatment. This is illustrated with binary mixtures of benzene and the n‐aliphatic alcohols, methanol to pentanol. The results are compared with calorimetric data available in the literature.
The consistent set of cross‐correlated coefficients provides a basis for calculating both isothermal and isobaric vapor‐liquid equilibria at various conditions for the binaries and for certain ternary and multicomponent mixtures without any additional data.