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.

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 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.

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.

Some Thermodynamic Properties of the Dimethylsulfoxide–Water and Propylene Carbonate–Water Systems at 25 °C

1974 ◽  
Vol 52 (5) ◽  
pp. 718-722 ◽  
Author(s):  
S. Y. Lam ◽  
R. L. Benoit
Keyword(s):  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Propylene Carbonate ◽  
Water Systems ◽  
Pressure Measurements ◽  
Free Energies ◽  
Carbonate Water ◽  
Enthalpies Of Mixing ◽  
Molar Excess ◽  
Vapor Pressure Measurements

Molar excess free energies of the systems dimethylsulfoxide–water and propylene carbonate–water have been calculated from static vapor pressure measurements at 25 °C. Enthalpies of mixing at low water concentrations have also been determined. Possible association interactions in these systems are discussed.

Thermodynamic Properties of Dilute Solutions of Hydrogen in Glassy PD.80SI.20

1981 ◽  
Vol 8 ◽  
Author(s):  
R.S. Finocchiaro ◽  
C.L. Tsai ◽  
B.C. Giessen
Keyword(s):  
Thermodynamic Properties ◽  
Composition Range ◽  
Volumetric Method ◽  
Vapor Pressures ◽  
Free Energies ◽  
Positive Deviation ◽  
Dilute Solutions ◽  
Maximum Value ◽  
Statistical Mechanical ◽  
Partial Molar Enthalpies

ABSTRACTEquilibrium vapor pressures of dilute solutions of hydrogen in glassy Pd.80Si.20 have been measured from 10–90°C and at hydrogen pressures P of 1–100 torr. Under these conditions the ratio of hydrogen to alloy, x as determined by a volumetric method, reaches a maximum value of 0.0070. Over this range of x, the system exhibits a positive deviation from Sieverts' Law; isotherms were analyzed in terms of Lacher's modified statistical mechanical theory of hydrogen in palladium. The data were used to calculate relative partial molar enthalpies, excess entropies, and excess free energies for the formation of the solid solutions. The thermodynamic properties were found to vary with hydrogen content over the composition range studied.

Deuterium and hydrogen sulfides: vapor pressures, molar volumes, and thermodynamic properties

1970 ◽  
Vol 48 (5) ◽  
pp. 764-775 ◽  
Author(s):  
E. C. W. Clarke ◽  
D. N. Glew
Keyword(s):  
Stainless Steel ◽  
Hydrogen Sulfide ◽  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Sulfide Liquid ◽  
Standard Thermodynamic Function ◽  
Vapor Pressures ◽  
Molar Volumes ◽  
Enthalpy Changes ◽  
Hydrolysis Of

An apparatus is described in which deuterium and hydrogen sulfides have been prepared by the hydrolysis of aluminum sulfide. Liquid densities have been determined at −79 °C and give the molar volumes 34.811 ± 0.003 cm3 for deuterium sulfide and 34.711 ± 0.003 for hydrogen sulfide. Vapor pressures of deuterium and hydrogen sulfides have been determined at −78 °C in a quartz–metal apparatus, and in the range −30 to +30 °C in a stainless steel apparatus. Equations are derived for the deuterium and hydrogen sulfide vapor pressures and for their ratio. An isotopic vapor pressure cross-over point is found at −48 °C, above which deuterium sulfide is more volatile than hydrogen sulfide. Gas and liquid molar volumes and enthalpy changes are evaluated for liquid vaporization at saturation. The deuterium and hydrogen sulfide vaporization standard thermodynamic function changes and their errors, together with the isotopic differences for these functions and their errors, are tabulated between −80 and +50°C.

Some thermodynamic properties of the sulfolane–benzene and sulfolane–dichloromethane systems

1969 ◽  
Vol 47 (22) ◽  
pp. 4195-4198 ◽  
Author(s):  
R. L. Benoit ◽  
J. Charbonneau
Keyword(s):  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Infinite Dilution ◽  
Partial Molar Volumes ◽  
Refractive Indices ◽  
Pressure Measurements ◽  
Free Energies ◽  
Volumes Of Mixing ◽  
Excess Partial Molar Volumes ◽  
Vapor Pressure Measurements

Molar excess free energies of the systems sulfolane-benzene and sulfolane–dichloromethane have been calculated from static vapor pressure measurements at 30.00 °C. Refractive indices, excess partial molar volumes of mixing, and enthalpies of mixing at infinite dilution of benzene and dichloromethane were also determined.

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