Dipole moments of seven refrigerants

Journal Article · Tue Oct 01 04:00:00 EDT 1991 · Journal of Chemical and Engineering Data; (United States)

DOI:https://doi.org/10.1021/je00004a019· OSTI ID:6991928

Meyer, C W; Morrison, G ^[1]

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1. Thermophysics Div., National Inst. of Standards and Technology, Gaithersburg, MD (United States)

This paper reports that Dielectric constant measurements have been performed on seven refrigerants in the gaseous state over the range 305-415 K in order to determine their dipole moments. Four of the refrigerants have temperature-independent moments: R123, [mu] -= 1.358 [plus minus] 0.019 D; R141b, [mu] = 2.014 [plus minus] 0.018 D; R22, [mu] = 1.458 [plus minus] 0.003 D; and R32, [mu] = 1.978 [plus minus] 0.007 D. Two refrigerants have conformer-dependent moments, making their time-averaged moments temperature dependent: R114, with a moment ranging from 0.668 [plus minus] 0.001 D at 308 K to 0.699 [plus minus] 0.001 D at 410 K; and E134, where the moment ranges from 1.739 [plus minus] 0.002 D at 309 K to 1.840 [plus minus] 0.001 D at 410 K. One refrigerant, R123a, has a moment that in principle could be temperature-dependent but in fact is temperature-independent; its value is [mu] = 1.302 [plus minus] 0.007 D. Accurate determination of a molecule's temperature-dependent dipole moment requires an independent determination of its electronic polarizability; this determination has been made from index of refraction measurements. Where possible, the present results are compared with earlier determinations of dipole moments.

• OSTI ID: 6991928
• Journal Information: Journal of Chemical and Engineering Data; (United States), Journal Name: Journal of Chemical and Engineering Data; (United States) Vol. 36:4; ISSN JCEAAX; ISSN 0021-9568
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
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DIELECTRIC PROPERTIES
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FLUORINE COMPOUNDS
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TEMPERATURE DEPENDENCE
TEMPERATURE EFFECTS
THERMODYNAMIC PROPERTIES
WORKING FLUIDS