Excess Thermodynamic Properties of Cyclopentane – Isomeric Decalin Systems at 25 °C

1971 ◽  
Vol 49 (15) ◽  
pp. 2481-2489 ◽  
Author(s):  
D. E. G. Jones ◽  
I. A. Weeks ◽  
G. C. Benson
Keyword(s):  
Thermodynamic Properties ◽  
Excess Properties ◽  
Excess Enthalpies ◽  
Free Energies ◽  
Excess Thermodynamic Properties ◽  
Molar Excess ◽  
Vapor Liquid Equilibria ◽  
Vapor Liquid

Molar excess enthalpies and volumes of the systems cyclopentane – cis-decalin and cyclopentane – trans-decalin at 25 °C were determined by direct calorimetric and dilatometric measurements. Excess Gibbs free energies, also at 25 °C, were obtained from a study of the vapor–liquid equilibria. The excess properties of these cyclopentane systems are compared with those of their cyclohexane counterparts, and are interpreted in terms of the theory of Flory.

Molar excess enthalpies, volumes, and Gibbs free energies of methanol – isomeric butanol systems at 25 °C

1970 ◽  
Vol 48 (16) ◽  
pp. 2457-2465 ◽  
Author(s):  
Jiří Polák ◽  
Sachio Murakami ◽  
V. T. Lam ◽  
H. D. Pflug ◽  
G. C. Benson
Keyword(s):  
Hydrogen Bonding ◽  
Binary Systems ◽  
Excess Properties ◽  
Excess Enthalpies ◽  
Free Energies ◽  
Molar Excess ◽  
Tert Butanol ◽  
Vapor Liquid Equilibria ◽  
Vapor Liquid

The vapor–liquid equilibria of the 4 binary systems formed by mixing methanol with n-butanol, isobutanol, sec-butanol, and tert-butanol were investigated at 25 °C in a dynamic still with circulation. The results were used to calculate the molar excess Gibbs free energies. For the three systems containing isobutanol, sec-butanol, or tert-butanol, molar excess enthalpies and volumes were also determined (mainly at 25 °C) by direct calorimetric and dilatometric techniques. The behavior of the excess properties is discussed with reference to differences in the hydrogen bonding and in the shapes of the component molecules.

Molar excess Gibbs free energies of benzene – m-xylene mixtures

1969 ◽  
Vol 47 (4) ◽  
pp. 539-542 ◽  
Author(s):  
T. Boublík ◽  
G. C. Benson
Keyword(s):  
Free Energy ◽  
Excess Free Energy ◽  
Free Energies ◽  
Energy Data ◽  
Molar Excess ◽  
Polar Mixtures ◽  
Vapor Liquid Equilibria ◽  
Flory’S Theory ◽  
Vapor Liquid

Vapor–liquid equilibria for the system benzene – m-xylene were measured in a circulation still at 25, 37, and 50 °C. Excess free energy data were analyzed in terms of Flory's theory of non-polar mixtures.

Osmotic and activity coefficients of triorganophosphates in n-octane

1982 ◽  
Vol 60 (22) ◽  
pp. 2755-2759 ◽  
Author(s):  
Norman H. Sagert ◽  
Danny W. P. Lau
Keyword(s):  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Activity Coefficients ◽  
Osmotic Coefficients ◽  
Vapor Pressure Osmometry ◽  
Excess Enthalpies ◽  
Free Energies ◽  
Ideal Behavior ◽  
Excess Thermodynamic Properties ◽  
Complex Models

Vapor pressure osmometry was used to measure osmotic coefficients for tributylphosphate (TBP), tricresylphosphate (TCP), and triethylhexylphosphate (TEHP) in n-octane at 30, 40, 50, and 60 °C and at molalities up to 0.3 mol/kg. Activity coefficients and excess thermodynamic properties (unsymmetrical definition) were calculated from these osmotic coefficients. At 30 °C, the excess Gibbs free energies for 0.1 mol of solute in 1.0 kg n-octane were −42 J, −66 J, and −20 J for TBP, TCP, and TEHP, respectively. The more ideal behavior of the TEHP-octane system is attributed to the increasing importance of hydrocarbon–hydrocarbon interactions as the chain length is increased. The excess enthalpies for 0.1 mol of solute in 1.0 kg of solvent were −100 J, −300 J, and −150 J for TBP, TCP, and TEHP, respectively. Thus, association of these solutes arises primarily from entropie effects.Our data could generally be accommodated adequately by postulating association of monomers into dimers. The exception was TCP at lower temperatures, where more complex models were required.

Excess thermodynamic properties of isopropanol–n-decanol mixtures

1969 ◽  
Vol 47 (4) ◽  
pp. 543-546 ◽  
Author(s):  
Jaswant Singh ◽  
H. D. Pflug ◽  
G. C. Benson
Keyword(s):  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Pressure Measurements ◽  
Free Energies ◽  
Excess Thermodynamic Properties ◽  
Temperature Range ◽  
Molar Excess ◽  
Volumes Of Mixing ◽  
Vapor Pressure Measurements

Molar excess Gibbs free energies, obtained from static vapor pressure measurements on isopropanol–n-decanol mixtures over the temperature range 20–50 °C, are reported. Results of direct determinations of heats and volumes of mixing at 25 °C are also presented.

Thermodynamic Properties of Cyclopentanol + p-Dioxane Mixtures at 25 °C

1973 ◽  
Vol 51 (24) ◽  
pp. 4140-4144 ◽  
Author(s):  
S. C. Anand ◽  
J.-P. E. Grolier ◽  
Osamu Kiyohara ◽  
G. C. Benson
Keyword(s):  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Excess Volumes ◽  
Excess Enthalpies ◽  
Vapor Pressures ◽  
Free Energies ◽  
Excess Thermodynamic Properties

Excess enthalpies, excess volumes, and total vapor pressures were measured for cyclopentanol + p-dioxane mixtures at 25 °C. The method of Barker was used to calculate vapour–liquid equilibria and excess Gibbs free energies from the vapor pressure results. A comparison with results (from the literature) for the systems cyclohexane + cyclopentanol and cyclohexane + p-dioxane indicates that the excess thermodynamic properties of cyclopentanol + p-dioxane mixtures arise primarily from the disruption of the structure of the p-dioxane solvent.

Aromatic fluorocarbon mixtures. VI. Vapour pressures of carbon tetrachloride + hexafluorobenzene

1974 ◽  
Vol 27 (10) ◽  
pp. 2159 ◽  
Author(s):  
NF Pasco ◽  
DV Fenby
Keyword(s):  
Carbon Tetrachloride ◽  
Thermodynamic Properties ◽  
Equations Of State ◽  
Liquid Mixture ◽  
Excess Enthalpies ◽  
Molar Excess ◽  
Mixture Theories

Measurements are reported of the vapour pressures of the system carbon tetrachloride + hexafluorobenzene at 278.68 K. The molar excess Gibbs functions GE/M, obtained from these measurements have been combined with previously reported molar excess enthalpies to give GE/M at 298 K. Thermodynamic properties of CCl4+C6F6 at 298 K are compared with the predictions of liquid mixture theories based on analytic equations of state.

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