A <sub>p‐V‐T</sub> Surface for Trifluoromethane

Rubio, Ramón G.; Zollweg, John A.; Streett, William B.

doi:10.1002/bbpc.19890930710

Cited by 41 publications

(29 citation statements)

References 37 publications

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“…The necessary input parameters for fluoroform were obtained by combining information from a variety of sources. [60][61][62] There is somewhat greater uncertainty in the fluoroform parameters.…”

Section: Theory Of T 1 Density Dependencementioning

confidence: 99%

Vibrational Lifetimes and Spectral Shifts in Supercritical Fluids as a Function of Density: Experiments and Theory

et al. 2000

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Vibrational lifetime and spectral shift data for the asymmetric CO stretching mode of W(CO) 6 in supercritical ethane, carbon dioxide, and fluoroform as a function of density at two temperatures are presented, and the lifetime (T 1 ) measurements are compared to theory. The data and theory are refinements of previous work. Measurements at zero density allow the contribution from solute-solvent interactions to be separated from strictly intramolecular contributions to T 1 . The results in the polyatomic SCFs are compared to data in Ar. The density functional/thermodynamic theory 1 has been extended to include contributions at large wavevector (k). Very good, quantitative agreement between theory and data taken in ethane and fluoroform is achieved, but the agreement for data taken in carbon dioxide, while reasonable, is not as good. The theory uses a variety of input information on the SCF properties obtained from the fluids' equations of state and other tabulated thermodynamic data. The solute-solvent spatial distribution is described in terms of hard spheres. The theory is able to reproduce the data without solute-solvent attractive interactions or clustering in the calculation of the spatial distribution.

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Section: Theory Of T 1 Density Dependencementioning

confidence: 99%

Vibrational Lifetimes and Spectral Shifts in Supercritical Fluids as a Function of Density: Experiments and Theory

et al. 2000

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“…These correspond to measurements made in the near critical region {T c = (299.01 ± 0.01) K, p c = (4.8162 ± 0.0018) MPa}. (5) It is believed that this problem is caused by several factors. One of them is the larger attenuation of the acoustic pulse, which decreases the signal to noise ratio at the output of the piezoelectric transducer, thus making measurements rather more difficult.…”

Section: Resultsmentioning

confidence: 98%

“…Because of its higher content of hydrogen atoms, its atmospheric lifetime is shorter, resulting in a global warming potential less than half that of CFC13. (5) In the present work, we report values of the speed of sound u of HFC23 measured with a newly built apparatus, with which the HFC32 speed of sound has recently been measured. (12) The measurements were obtained in the temperature range 258 K to 303 K and pressures up to 65 MPa.…”

Section: Introductionmentioning

confidence: 99%

“…The present speed of sound data together with published density ρ data (4)(5)(6)(7)(8)(9)(10)(11) were used to calculate thermodynamic properties such as the isentropic compressibility κ s , the isothermal compressibility κ T , the cubic expansion coefficient α p , and the specific heat capacity at constant pressure c p .…”

Section: Introductionmentioning

confidence: 99%

“…(3) Derived thermodynamic properties such as the isentropic compressibility κ s , the isothermal compressibility κ T , the cubic expansion coefficient α p , and the specific heat capacity at constant pressure c p are calculated by combining the present experimental data with the density values published by other authors. (4)(5)(6)(7)(8)(9)(10)(11) The estimated properties are compared, where possible, with literature data. …”

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The speed of sound, and derived thermodynamic properties of liquid trifluoromethane (HFC23) fromT=(258 to 303)K at pressures up to 65MPa

Pires

Guedes

1999

The Journal of Chemical Thermodynamics

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Solution Non‐Randomness and the W‐Shape Concentration Dependence of C^E_p for Hexafluorobenzene and Chloronaphthalene in Hydrocarbons

Andreoli-Ball

Costas

Patterson

et al. 1989

Ber Bunsenges Phys Chem

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H m t Cupacitja Liquids / ThermodynamicsExcess heat capacities, C,' have been obtained through the concentration range at 25-C for five sets of systems of type A, + 9 : hexafluorobenzene + 2.2,4-trimethylpentane and 2,2,4,4,6,8,8-heptamethylnonane; hexafluorobenzene + cyclohexane (10' , W) and dicyclohexyl (W); I-chloronaphthalene + 2,2-dimethylbutane, 2,2,4-trimethylpentane (W) and 2,2,4,4,6,8,8-heptamethylnonane (W). I -chloronaphthalene + n-hexadecane: I-chloronaphthalene + cyclohexane and dicyclohexyl (IS?, W). For the systems indicated, C,' has a W-shape, i.e., two minima separated by a maximum or two changes of sign of the curvature. The W-shape does not occur for hexafluorobenzene + cyclohexane at 25 but appears at lo?. Temperature and molecular size act on C," through the degree of solution non-randomness as indicated by G ' and the concentration-concentration correlation function, S,,, which is a good predictor for the W-shape and of the concentration at which the maximum appears. The W-shape corresponds to an S,, value greater than 0.7 and G E > 800 J mol-I, the temperature being within 100 K of the UCST.New absolute measurements of the thermal conductivity of aqueous NaCI, KCl and CaCI2 solutions are presented. The concentrations studied were 10% and 20% by weight of NaCl and KCl, and 10, 20 and 30% by weight of CaCI2. The measurements were performed in a transient hot-wire apparatus employing two thin tantalum wires coated with an anodic tantalum pentoxide insulation layer. The temperature range examined was 290 to 345 K and the pressure was atmospheric. The uncertainty of the measurements is estimated to be +0.5%, an estimate confirmed by the measurement of the thermal conductivity of water. -Existing correlations for the thermal conductivity of aqueous inorganic salt solutions are also examined. The measurements have been used to develop a simple consistent correlative and predictive scheme that allows the correlation of the thermal conductivity of these solutions with an uncertainty of f0.7% and the prediction of the thermal conductivity to high pressures with an uncertainty of +2.5%.

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A _p‐V‐T Surface for Trifluoromethane

Cited by 41 publications

References 37 publications

Vibrational Lifetimes and Spectral Shifts in Supercritical Fluids as a Function of Density: Experiments and Theory

Vibrational Lifetimes and Spectral Shifts in Supercritical Fluids as a Function of Density: Experiments and Theory

The speed of sound, and derived thermodynamic properties of liquid trifluoromethane (HFC23) fromT=(258 to 303)K at pressures up to 65MPa

Solution Non‐Randomness and the W‐Shape Concentration Dependence of C^E_p for Hexafluorobenzene and Chloronaphthalene in Hydrocarbons

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A p‐V‐T Surface for Trifluoromethane

Cited by 41 publications

References 37 publications

Vibrational Lifetimes and Spectral Shifts in Supercritical Fluids as a Function of Density: Experiments and Theory

Vibrational Lifetimes and Spectral Shifts in Supercritical Fluids as a Function of Density: Experiments and Theory

The speed of sound, and derived thermodynamic properties of liquid trifluoromethane (HFC23) fromT=(258 to 303)K at pressures up to 65MPa

Solution Non‐Randomness and the W‐Shape Concentration Dependence of CEp for Hexafluorobenzene and Chloronaphthalene in Hydrocarbons

Contact Info

Product

Resources

About

A _p‐V‐T Surface for Trifluoromethane

Solution Non‐Randomness and the W‐Shape Concentration Dependence of C^E_p for Hexafluorobenzene and Chloronaphthalene in Hydrocarbons