Semi-regular solution: General behavior

We have described the behavior of a subgroup of regular solutions not very far from ideality (Hildebrand, 1929, 1947, 1951) that is analogous to the behavior of ideal solutions. For this subgroup the composition of each phase in equilibrium may be related logarithmically. We have found that some cas...

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Bibliographic Details
Published in:Chemical engineering science 2012-01, Vol.68 (1), p.443-448
Main Authors: Castellanos-Suárez, Aly J., García-Sucre, Máximo
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Azeotrope
Chemical engineering
equations
Exact sciences and technology
Fluid dynamics
Fluid flow
Fluids
Isotherms
Liquids
Mathematical analysis
Phase equilibria
Regular solution
Shortcut
Subgroups
Volatility
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Summary:We have described the behavior of a subgroup of regular solutions not very far from ideality (Hildebrand, 1929, 1947, 1951) that is analogous to the behavior of ideal solutions. For this subgroup the composition of each phase in equilibrium may be related logarithmically. We have found that some cases of isothermal, isobaric and ternary liquid–vapor systems in equilibrium follow this scheme. In each case the resulting calculations of phase compositions are in good agreement with the experimental data reported in the literature. This approach is consistent with correlations frequently used in liquid–liquid case (known as the Othmer-Tobias (1942) and Hand (1930) equations), as well as adsorption of liquid on solid (known as Langmuir–Freundlich isotherm (Dąbrowski et al., 1979)). For fluids mixtures presenting this behavior we use the term of semi-regular mixtures. For this kind of fluid mixtures it can be found a simplified procedure to relate the equilibrium compositions that may be used as “shortcut” for chemical engineering designs. The semi-regular mixtures are a subgroup of the regular solutions. These systems show linear behavior and according to the value of slope q, it will be: –– ideal solution, ▪ Negative deviation, or ▪ positive deviation of the Raoult Law. The location of azeotropic point also depends of q. [Display omitted] ► We have described the behavior of a subgroup of the regular solutions. ► This kind of fluid mixtures, presents a simplified way to relate the equilibrium compositions. ► Some cases of isothermal, isobaric and ternary liquid–vapor systems are treat. ► This approach may be used in calculus type “shortcut” for chemical engineering designs.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2011.10.002