Dielectric permittivity, polarizability and dipole moment of refrigerants R1234ze(E) and R1234yf determined using a microwave re-entrant cavity resonator

Sampson, Catherine C.; Kamson, Mobolaji; Hopkins, Matthew; Stanwix, Paul L.; May, Eric F.

doi:10.1016/j.jct.2018.07.011

Cited by 19 publications

(10 citation statements)

References 29 publications

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“…In this regard, solubility differences observed among hydrofluorocarbon gases in [C 2 mim][SCN] be related to their polar nature. However, the electric dipole moments of R32, R134a and R1234yf (1.649, 1.563 and 2.24 D, respectively [18,65]) do not correlate the observed solubility trend (R32 > R134a > R1234yf), a fact that is in good agreement with previous works [18].…”

Section: Thermodynamic Separation Assessmentsupporting

confidence: 82%

Enhanced absorption separation of hydrofluorocarbon/hydrofluoroolefin refrigerant blends using ionic liquids

Asensio-Delgado

Pardo

Zarca

et al. 2020

Separation and Purification Technology

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Section: Thermodynamic Separation Assessmentsupporting

confidence: 82%

Enhanced absorption separation of hydrofluorocarbon/hydrofluoroolefin refrigerant blends using ionic liquids

Asensio-Delgado

Pardo

Zarca

et al. 2020

Separation and Purification Technology

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“…Subsequently, re-entrant cavities, in which the fluid was contained within the resonator, were introduced by Goodwin, Mehl, and Moldover to measure phase boundaries and molar polarizabilities of mixtures. Re-entrant cavities have emerged as the preferred microwave-based method for measuring the dielectric permittivity of a fluid at high pressures and can also provide accurate measurements of the dew point and density. − The technique was extended by May et al and then used by Kandil et al to estimate the liquid volume fraction (Λ) using microwave cavities that were principally designed for dew-point sensing and dielectric measurements, respectively. In the work of May et al, a normalized mode-shape function was introduced that relates the response of the cavity’s resonance frequencies to the volume fractions occupied by the liquid and vapor phases.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Fluid-Phase Behavior Using an Advanced Microwave Re-Entrant Cavity

et al. 2020

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To advance the thermodynamic models needed for many industrial processes, accurate measurements of fluid-phase behavior are essential. Therefore, we present a newly designed microwave re-entrant cavity apparatus to deliver improved phase-behavior measurements of pure and multicomponent fluids. The re-entrant geometry has spatially distinct resonant modes, which are used to determine the dielectric permittivity of the liquid and vapor phase and the liquid volume fraction (Λ). The first mode (f vac ≈ 320 MHz) is sensitive to small liquid volumes, the second (1.86 GHz) is sensitive to small vapor volumes, and the third (6.57 GHz) is sensitive to the interface location. At equilibrium, a system of three equations, one for each mode, allows for the dielectric permittivity of each phase and Λ to be determined from the measured resonant frequencies. The cavity’s suitability for solving this inverse problem was explored using finite element analysis and experiments with pure propane and pentane. A primary limitation of the method was the dependence of the mode-shape functions (G n ) on phase permittivities, which become measurable for high-frequency modes. We propose a solution to account for this dependence using finite element simulations that map the G n surface as a function of Λ and the ratio of phase dielectric permittivities.

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“…For instance, Rogers et al, Goodwin et al, and May et al conducted phase behavior measurements on acid–gas/heavy oil systems, (CH 4 + C 3 H 8 ) mixtures and multicomponent gas condensate mixtures. Dielectric permittivity measurements of hydrocarbon mixtures using the same technique were published by Kandil et al and May et al; , Sampson et al . recently reported data for refrigerants.…”

Section: Introductionmentioning

confidence: 87%

“…For instance, Rogers et al, 10 Goodwin et al, 11 and May et al 12 conducted phase behavior measurements on acid−gas/ heavy oil systems, (CH 4 + C 3 H 8 ) mixtures and multicomponent gas condensate mixtures. Dielectric permittivity measurements of hydrocarbon mixtures using the same technique were published by Kandil et al 13 and May et al; 14,15 Sampson et al 16 recently reported data for refrigerants. In our previous work and with respect to the investigation of mixtures relevant to CCS-processes, a microwave re-entrant cavity resonator was deployed to determine key properties of, for example, (Ar + CO 2 ) and (CO + CO 2 ) as well as for measurements of CO's electrical properties, as described in detail by Tsankova et al 17−20 In the present work, dew points, dielectric permittivities, and molar densities of two gravimetrically prepared binary (H 2 + CO 2 ) mixtures with CO 2 mole fractions of 0.94638 and 0.74576 were investigated.…”

Section: Introductionmentioning

confidence: 89%

Dew Points, Dielectric Permittivities, and Densities for (Hydrogen + Carbon Dioxide) Mixtures Determined with a Microwave Re-Entrant Cavity Resonator

Tsankova

Leusmann

Richter

2019

Ind. Eng. Chem. Res.

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Accurate dew-point, dielectric permittivity, and density measurements of two binary (H 2 + CO 2 ) mixtures with CO 2 mole fractions of 0.94638 and 0.74576 were carried out utilizing an apparatus that employs a microwave re-entrant cavity resonator. Isochoric dew-point measurements were conducted at pressures up to 7.1 MPa and temperatures from T = (249.55 to 296.61) K for the (0.05362 H 2 + 0.94638 CO 2 ) mixture and between T = (251.63 and 280.44) K for the (0.25424 H 2 + 0.74576 CO 2 ) mixture. The combined expanded uncertainty with a level of confidence of approximately 95% (k = 2) in dew-point temperature and pressure ranged between (0.016 and 0.065) K and (0.0041 and 0.0177) MPa, respectively. Within 2.5%, the new data were consistent with the predictions of the GERG-2008 equation of state. Measurements of dielectric permittivity in the single-phase vapor region over the temperature range from (273.06 to 313.18) K at pressures up to 8.2 MPa and in the vicinity of the phase boundary were conducted to determine mixture molar densities by applying a method based on the polarizability mixing rule developed by Harvey and Prausnitz. The microwave-determined mixture densities near 5 MPa agree within 0.33% of reported values measured with a precision twosinker magnetic suspension densimeter; mixture densities near 8 MPa agree within 1.33% of values calculated with the GERG-2008 equation of state.

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Dielectric permittivity, polarizability and dipole moment of refrigerants R1234ze(E) and R1234yf determined using a microwave re-entrant cavity resonator

Cited by 19 publications

References 29 publications

Enhanced absorption separation of hydrofluorocarbon/hydrofluoroolefin refrigerant blends using ionic liquids

Enhanced absorption separation of hydrofluorocarbon/hydrofluoroolefin refrigerant blends using ionic liquids

Characterization of Fluid-Phase Behavior Using an Advanced Microwave Re-Entrant Cavity

Dew Points, Dielectric Permittivities, and Densities for (Hydrogen + Carbon Dioxide) Mixtures Determined with a Microwave Re-Entrant Cavity Resonator

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