Sound velocity in liquid CCl<sub>2</sub> F<sub>2</sub> and the law of corresponding states

Poole, G. R.; Aziz, Ronald A.

doi:10.1002/aic.690180228

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…All these are difficult to compare directly with the simpler spherical effective potentials proposed here. On the other hand, there are several simple effective potentials that were reported at least three decades ago: some of these were described by Hirschfelder et al [6] and those obtained by corresponding-states analysis of speed of sound data [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Interaction potentials and thermodynamics of small polar molecules. The case of C₁-Freons (halomethanes)

et al. 2006

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The recently proposed approximate nonconformal (ANC) theory has been very successful in determining effective interaction potentials for a large number of pure substances in the gaseous state: noble gases, homodiatomics, alkanes, perfluoroalkanes and some small polyatomic molecules, as well as many of their binary mixtures. ANC potentials are spherically symmetric Kihara-like functions involving an energy ", a diameter and a form parameter s. In this work, we propose an effective-potential theory valid at finite densities. The basic assumption is that ANC potential functions represent effectively the thermodynamics of a substance over the isotropic fluid region given the appropriate state dependencies of ", and s. The theory proposes a relation between the critical temperature of a substance and " that is used here to predict effective potentials for the one-carbon Freons: CCl a collection of small molecules that are all of similar geometry but varying degrees of polarity. As a test of the reliability of the theory the calculated second virial coefficients B(T ) are compared with experiment. For most of these substances, B(T ) is reproduced within experimental error. The relative contributions of the polar and nonpolar parts of the potential to the thermodynamics are discussed. The approach produces effective interactions and generalized Stockmayer potentials for this set of molecules to be used in predicting other thermodynamic properties.

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Section: Introductionmentioning

confidence: 99%

Interaction potentials and thermodynamics of small polar molecules. The case of C₁-Freons (halomethanes)

et al. 2006

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“…

The velocity of sound has previously been measured in liquids CCl, (Rowlinson, 1959) at constant pressure and in CF4 (Aziz et al, 1967) and CC12F2 (Poole and Aziz, 1972) under saturated vapor. To complete this series, measurements for the velocity of sound in liquid CCgF and CCIF3 under saturated vapor are presented in this paper.

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Relative intermolecular energy parameters for the freons from sound velocity data

Aziz

1974

AIChE Journal

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The velocity of sound has previously been measured in liquids CCl, (Rowlinson, 1959) at constant pressure and in CF4 (Aziz et al., 1967) Table 1. To see that it is the relative value which is determined, consider Figure 2 in which we have schematically plotted log (VU2M/ ( d k ) for substances X and Y. Assume that the reduced curve V," vs. To is represented by the dotted line. The precise location of the reduced curve will depend on the specific model potential chosen with the form of Equation ( 3 ) . The curves for X and Y may be brought into coincidence with the dotted one by mapping corresponding points along a 45" angle. For example, points A and B map into C and lengths ab and de, both equal to log e Y / c x give the relative value of the energy parameter regardless of the detailed form of the intermolecular potential provided only it has the general form of Equation (1). Thus, the determination of the relative value of c can be made in an unambiguous way without any simultaneous adjustment of Nok) = log VUo2 + log ( d k ) VS. log T = log To + log U. CONCLUSIONBy forcing corresponding states as applied to sound velocity in the liquid freons, we have obtained accurate relative values of the energy parameter of an effective intermolecular potential of form of Equation (3) in an unambiguous way. These relative values of d k may be useful in removing the indeterminacy of potentiaI parameters in the regression of other data. July, 1974Poge 817 ACKNOWLEDGMENT

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Brillouin scattering and refractive index measurements on low temperature liquids. II. CF4, CF3Cl, CF2Cl2, CFCl3 and CCl4

Yoshihara¹,

Anderson²,

Aziz³

et al. 1980

Chemical Physics

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Sound velocity in liquid CCl₂ F₂ and the law of corresponding states

Cited by 8 publications

References 11 publications

Interaction potentials and thermodynamics of small polar molecules. The case of C₁-Freons (halomethanes)

Interaction potentials and thermodynamics of small polar molecules. The case of C₁-Freons (halomethanes)

Relative intermolecular energy parameters for the freons from sound velocity data

Brillouin scattering and refractive index measurements on low temperature liquids. II. CF4, CF3Cl, CF2Cl2, CFCl3 and CCl4

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Sound velocity in liquid CCl2 F2 and the law of corresponding states

Cited by 8 publications

References 11 publications

Interaction potentials and thermodynamics of small polar molecules. The case of C1-Freons (halomethanes)

Interaction potentials and thermodynamics of small polar molecules. The case of C1-Freons (halomethanes)

Relative intermolecular energy parameters for the freons from sound velocity data

Brillouin scattering and refractive index measurements on low temperature liquids. II. CF4, CF3Cl, CF2Cl2, CFCl3 and CCl4

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Sound velocity in liquid CCl₂ F₂ and the law of corresponding states

Interaction potentials and thermodynamics of small polar molecules. The case of C₁-Freons (halomethanes)

Interaction potentials and thermodynamics of small polar molecules. The case of C₁-Freons (halomethanes)