Limitations imposed by conditions of stability on the dependence of activity coefficients on composition for binary solutions of non-electrolytes

1960 ◽  
Vol 9 (10) ◽  
pp. 1736-1738
Author(s):  
A. N. Kirgintsev
Keyword(s):  
Activity Coefficients ◽  
Binary Solutions ◽  
Conditions Of Stability

Limiting activity coefficients in dilute solutions of nonelectrolytes. II. Determination for polar–nonpolar and polar–polar binary mixtures, and the application of some solubility-parameter treatments

1986 ◽  
Vol 64 (1) ◽  
pp. 198-203 ◽  
Author(s):  
Shapour Afrashtehfar ◽  
Genille C. B. Cave
Keyword(s):  
Binary Mixture ◽  
Activity Coefficients ◽  
Vapor Phase ◽  
Solubility Parameter ◽  
Chromatographic Analysis ◽  
Dipole Interaction ◽  
The Other ◽  
Binary Solutions ◽  
Polar Components ◽  
Induced Dipole

Activity coefficients were determined at 293.15 K for the more dilute component in 24 binary solutions of nonelectrolytes, by gas-chromatographic analysis of the equilibrium vapor phase. One component of the binary mixture was either nitromethane, nitroethane, 1-nitropropane, 2-nitropropane, ethanenitrile, propanenitrile, ethyl ethanoate, or butyl ethanoate; and the other component was either heptane, 1-heptene, or 1,6-heptadiene.From the limiting activity coefficients of these components, some factors that affected their magnitude were identified. The values were also used to test the modifications of Prausnitz, Blanks, and Weimer, of Helpinstill and Van Winkle, and of Keller, Karger, and Snyder to the Scatchard–Hildebrand equation modified to accommodate polar components. In addition, the degree of constancy of the ratio of the dipole – induced dipole interaction parameter for a series of solutes in one solvent to that in another was considered.

scholarly journals Technical note: Estimating aqueous solubilities and activity coefficients of mono- and <i>α</i>, <i>ω</i>-dicarboxylic acids using COSMO-RS-DARE

2020 ◽  
Author(s):  
Noora Hyttinen ◽  
Reyhaneh Heshmatnezhad ◽  
Jonas Elm ◽  
Theo Kurtén ◽  
Nønne L. Prisle
Keyword(s):  
Activity Coefficients ◽  
Equilibrium Constants ◽  
Hydrate Formation ◽  
Dicarboxylic Acids ◽  
Water Systems ◽  
Technical Note ◽  
Monocarboxylic Acids ◽  
Binary Solutions ◽  
Experimental Activity ◽  
Aqueous Solubilities

Abstract. We have used the COSMOtherm program to estimate activity coefficients and solubilities of mono- and α, ω-dicarboxylic acids, and water in binary acid-water systems. The deviation from ideality was found to be larger in the systems containing larger acids than in the systems containing smaller acids. We found a better agreement between estimated and experimental activity coefficients of monocarboxylic acids when the water clustering with a carboxylic acid and itself was taken into account using the dimerization, aggregation and reaction extension (COSMO-RS-DARE) of COSMOtherm. Based on effective equilibrium constants of different clustering reactions in the binary solutions, acid dimer formation is more dominant in systems containing larger dicarboxylic acids (C5–C8), while for monocarboxylic acids (C1–C6) and smaller dicarboxylic acids (C2–C4), hydrate formation is more favorable, especially in dilute solutions.

Determining activity coefficients of liquids in binary solutions: A new method

1970 ◽  
Vol 47 (12) ◽  
pp. 826 ◽  
Author(s):  
H. J. Arnikar ◽  
T. S. Rao ◽  
A. A. Bodhe
Keyword(s):  
Activity Coefficients ◽  
New Method ◽  
Binary Solutions
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