Limiting activity coefficients in dilute solutions of nonelectrolytes. I.Determination for polar–nonpolar binary mixtures by a novel apparatus, and a solubility-parameter treatment of results

1982 ◽  
Vol 60 (21) ◽  
pp. 2697-2706 ◽  
Author(s):  
Etela Milanová ◽  
Genille C. B. Cave
Keyword(s):  
Binary Mixtures ◽  
Activity Coefficients ◽  
Solubility Parameter ◽  
Butyl Acetate ◽  
Dipole Interaction ◽  
Polar Compounds ◽  
Polar Component ◽  
Nonpolar Solvents ◽  
Induced Dipole ◽  
Polar Solutes

The activity coefficients of several solutes in dilute binary solutions of nonelectrolytes were determined at 20 °C from vapour–liquid equilibria in a novel static equilibration apparatus, by gas-chromatographic analysis of the equilibrium vapor phase. The solutes were nitromethane, nitroethane, 1-nitropropane, 2-nitropropane, acetonitrile, propionitrile, ethyl acetate, and n-butyl acetate in n-heptane and in benzene as solvents, and also carbon tetrachloride as solute in each of the above-listed polar compounds as the solvent.The modifications by Weimer and Prausnitz and by Blanks and Prausnitz to the Scatchard–Hildebrand equation in order to accommodate binary mixtures containing a polar component were tested by using the values found in the present work for the limiting activity coefficients of these solutes. In addition, it was found that the ratio of the dipole – induced dipole interaction parameter for polar solutes in the two nonpolar solvents was nearly constant.Three methods for evaluating the dispersion contribution to the solubility parameter of a polar compound were considered.

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 Assessment of certain ionic liquids for separation of binary mixtures based on gamma infinity data measurements

RSC Advances ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 7092-7107 ◽  
Author(s):  
M. Karpińska ◽  
M. Wlazło ◽  
D. Ramjugernath ◽  
P. Naidoo ◽  
U. Domańska
Keyword(s):  
Ionic Liquids ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Thermodynamic Functions ◽  
Partition Coefficients

Limiting activity coefficients for 64 solutes in [BzMIM][NTf2] and [BzMIM][DCA], the gas–liquid partition coefficients, KL, thermodynamic functions and selectivity for hexane/hex-1-ene, cyclohexane/cyclohexene and ethylbenzene/styrene separation were presented.

scholarly journals SPECTROSCOPIC STUDY OF THE PROCESS OF HYPOCHROMIC EFFECT IN SOL T IN SOLUTIONS OF N UTIONS OF NATURAL D TURAL DYES AND VI YES AND VITAMIN B2 AMIN B2

2020 ◽  
Vol 4 (3) ◽  
pp. 21-27
Author(s):  
Salikh Khusenovich Astanov ◽  
◽  
Siddiq Kakhkharovich Kakhkharov ◽  
Keyword(s):  
Spectroscopic Study ◽  
Binary Mixtures ◽  
Self Assembly ◽  
Spectroscopic Method ◽  
Dipole Interaction ◽  
Absorption Capacity ◽  
Vitamin B2 ◽  
Intense Absorption ◽  
Hypochromic Effect

The process of self-assembly of riboflavin molecules in aqueous and binary mixtures of solvents was investigated by the spectroscopic method. It was shown that during the assembly of vitamin B2 molecules, dipole-dipole interaction occurs, as a result of which resonant splitting of excited electronic levels of riboflavin molecules occurs. And the observable hypo chromic effect is due to a decrease in the intense absorption capacity of the aggregated riboflavin molecules themselves.

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