Dielectric Constant, Dielectric Virial Coefficients, and Dipole Moments of 1,1,1,2-Tetrafluoroethane

Barao, Teresa; Castro, C. A. Nieto de; Mardolcar, U. V.; Okambawa, R.; St-Arnaud, Jean M.

doi:10.1021/je00022a021

Cited by 27 publications

(16 citation statements)

References 7 publications

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“…These refrigerants are the most popular candidates for use in electro-mobile air conditioning systems. The results of the permittivity measurement of R134a were in agreement with the results given in Barao et al (1995), Meurer et al (2001), Barao et al (1996) and Fellows et al (1991). Also the value of the permittivity of R152a is comparable to the results presented in Barao et al (1998) andFellows et al (1991) (Fig.…”

Section: Measurements Of Refrigerants Oils and Refrigeranteoil Mixturessupporting

confidence: 90%

“…The analysis of the dielectric constant and the DC resistivity of refrigerants and refrigeranteoil mixtures in the relevant temperature interval between À30 C and þ90 C and at pressures up to 100 bar is quite challenging. Only a few research groups around the world have been working on this subject (Barao et al, 1995(Barao et al, , 1996(Barao et al, , 1998Baustian et al, 1986;Bö hmer and Loid, 1988;Fellows et al, 1991;Hwang et al, 2008;Meurer et al, 2001;Ribeiro & Nieto de Castro, 2009;Tanaka et al, 1999) mostly using pure substances, but no refrigeranteoil systems.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of electrical properties of refrigerants and refrigerant–oil mixtures

Feja

2012

International Journal of Refrigeration

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Section: Measurements Of Refrigerants Oils and Refrigeranteoil Mixturessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Measurement of electrical properties of refrigerants and refrigerant–oil mixtures

Feja

2012

International Journal of Refrigeration

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“…A food grade 1,1,1,2-tetrafluoroethane (CAS number 811-97-2), purchased from the Frigo Chem Ltd. (Bulgaria), was used as an extractant. It is non-polar, pressurized gas solvent featuring colourless and practically odourless liquid with the following parameters: dipole moment of 2.058 Debay [ 38 ]; dielectric constant of 3.54 [ 62 ]; boiling temperature of −26 °C at 0.101 MPa; saturation pressure at 20 °C of 0.57 MPa [ 37 ]; dynamic viscosity at 20 °C of 0.2 mPa; surface tension at same temperature 8.5 mN/m [ 37 ].…”

Section: Methodsmentioning

confidence: 99%

Subcritical Extracts from Major Species of Oil-Bearing Roses—A Comparative Chemical Profiling

et al. 2021

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A comprehensive chemical profiling of 1,1,1,2-tetrafluoroethane (freon R134a) subcritical extracts from the main genotypes of oil-bearing roses, was performed by gas chromatography–mass spectrometry (GC/MS) and gas chromatography with flame ionization detection (GC-FID) in order to reveal the differences in their chemical composition. One hundred and three individual compounds were identified using GC/MS and their quantitative content was determined using GC-FID, representing 89.8, 92.5, 89.7 and 93.7% of the total content of Rosa gallica L., Rosa damascena Mill., Rosa alba L. and Rosa centifolia L. extracts, respectively. The compounds found in the extracts are representatives of the following main chemical classes: mono-, sesqui- and triterpenoids, phenylethanoids and phenylpropanoids and aliphatic hydrocarbons. Fatty acids, esters and waxes were found, as well. The study revealed that 2-phenylethanol is the most abundant component, ranging 9.0–60.9% followed by nonadecane and nonadecene with 5.1–18.0% geraniol (2.9–14.4%), heneicosane (3.1–11.8%), tricosane (0.1–8.6%), nerol (1.3–6.1%) and citronellol (1.7–5.3%). The extracts demonstrate a specific chemical profile, depending on the botanical species—phenylethanoids and phenyl propanoids are the main group for R. damascena, aliphatic hydrocarbons for R. alba and R. centifolia, while both are found in almost equal amounts in R. gallica. The terpenoid compounds show relatively broad variations: monoterpenes—11.9–25.5% with maximum in R. centifolia; sesquiterpenes—0.6–7.0% with maximum in R. gallica and triterpenes—0.4–3.7% with maximum in R. gallica extract.

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“…The values of the experimental data which were obtained at a frequency of 10 kHz with an estimated precision of 0.01% and an accuracy better than 0.1% will be published elsewhere for HFC 134a [9]. Data for HFC 142b are presented here.…”

Section: Methodsmentioning

confidence: 99%

The dielectric constant of liquid HFC 134a and HCFC 142b

1996

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This paper presents measurements of the dielectric constant of HFC 134a and HCFC 142b, as a function of pressure and temperature, in the temperature range from 200 to 300 K and pressures up to 20 MPa, using a direct capacitance method. The samples used had a stated purity of 99.8 and 99.9 %, respectively. The values of the dielectric constant have a precision of 0.01% and an accuracy of 0.1%. The data obtained were correlated as a function of density and pressure. The theory developed by Vedam et al., based on the Eulerian strain, and the Kirkwood equation for the variation of modified molar polarization with temperature and density were applied to analyze the data and to obtain the dipole moment of both refrigerants in the liquid state.

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Dielectric Constant, Dielectric Virial Coefficients, and Dipole Moments of 1,1,1,2-Tetrafluoroethane

Cited by 27 publications

References 7 publications

Measurement of electrical properties of refrigerants and refrigerant–oil mixtures

Measurement of electrical properties of refrigerants and refrigerant–oil mixtures

Subcritical Extracts from Major Species of Oil-Bearing Roses—A Comparative Chemical Profiling

The dielectric constant of liquid HFC 134a and HCFC 142b

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