Viscosity measurements of ortho -xylene, meta -xylene, para -xylene and ethylbenzene

Meng, Xianyang; Gu, Xiaoyun; Wu, Jiangtao; Vesovic, Velisa

doi:10.1016/j.jct.2015.11.027

Cited by 13 publications

(15 citation statements)

References 28 publications

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“…The uncertainties quoted in Table 1 were used to determine relative weights for all the primary data. The optimal coefficients D i , E i , k i and n i are shown in Table 2, while the critical temperature T c (617.12 K) and critical density ρ c (2.741016 mol l Meng et al 87 are reproduced by the proposed correlation within their claimed experimental uncertainty of 2.0%. Figure 7 illustrates the agreement of the developed viscosity correlation with the primary experimental data at atmospheric pressure that cover the temperature range (178 to 405) K, in the liquid phase.…”

Section: -7mentioning

confidence: 74%

“…Table 1 summarizes the primary data 25,26,31,36,40,41,54,69,87 detailing the temperature and pressure ranges, the uncertainty attributed to the measurements, authors claimed purity of the sample, and the technique employed to perform the measurements. The choice of primary data is discussed in more detail in section 3 that also provides a comparison of the data by different workers.…”

Section: Experimental Viscosity Datamentioning

confidence: 99%

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Reference Correlation of the Viscosity of Ethylbenzene from the Triple Point to 673 K and up to 110 MPa

Meng

Cao

et al. 2017

Journal of Physical and Chemical Reference Data

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A new correlation for the viscosity of ethylbenzene is presented. The correlation is based upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory. It is applicable in the temperature range from the triple point to 673 K at pressures up to 110MPa. The overall uncertainty of the proposed correlation, estimated as the combined expanded uncertainty with a coverage factor of 2, varies from 1% for the viscosity at atmospheric pressure to 5% for the highest temperatures and pressures of interest. Tables of the viscosity, generated by the relevant equations, at selected temperatures and pressures, and along the saturation line, are provided.Comparison of viscosity of xylene isomers indicated that at very high temperatures the viscosity correlation of para-xylene has higher uncertainty than previously postulated. Thus, in this work we also provide a revised viscosity correlation for p-xylene.-1 -CONTENTS

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Section: -7mentioning

confidence: 74%

Section: Experimental Viscosity Datamentioning

confidence: 99%

Reference Correlation of the Viscosity of Ethylbenzene from the Triple Point to 673 K and up to 110 MPa

Meng

Cao

et al. 2017

Journal of Physical and Chemical Reference Data

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“…Figure 9 illustrates the agreement with the experimental data in the liquid region for pressures higher than atmospheric. The experimental data of Kashiwagi and Makita 38 and Meng et al 92 are reproduced by the proposed correlation within their claimed experimental uncertainty of 2.0 %, except for one data point of Meng et al 92 The data of Mamedov et al 33,34 exhibit the deviations, from (-2.4 to 2.9) %, that are within the assigned uncertainty of 4 %, over the temperature range (498 to 548) K. Table 3 summarizes the agreement between the primary experimental data and the proposed viscosity correlation for o-xylene in the liquid, dense vapor and supercritical regions. The correlation recaptures the entire set of primary data with an average absolute deviation (AAD) of 0.9 %, bias of 0.2 % and maximum deviation of 3.7 %.…”

Section: 7mentioning

confidence: 96%

“…Based on the previous studies, 3,5,6,[8][9][10][11][12][13][15][16][17][18][19] There is no theoretical guidance for the residual-viscosity contribution and hence the existence of accurate experimental data covering a wide range of temperature and pressure is paramount for developing reliable correlations. A number of authors 27,33,34,36,38,46,92 have measured the viscosity of o-…”

Section: 7mentioning

confidence: 99%

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Based on these criteria, 10 datasets were considered primary viscosity data. Table 1 summarizes the primary data 24,28,33,34,38,39,40,45,75,92 detailing the temperature and pressure ranges, the uncertainty attributed to the measurements, authors claimed purity of the sample, and the technique employed to perform the measurements. The choice of primary data is discussed in more detail in section 3 that also provides a comparison of the data by different workers.…”

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confidence: 99%

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Reference Correlation of the Viscosity of ortho-Xylene from 273 to 673 K and up to 110 MPa

Cao

Meng

et al. 2016

Journal of Physical and Chemical Reference Data

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A new correlation for the viscosity of ortho-xylene (o-xylene) is presented. The correlation is based upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory. It is applicable in the temperature range from 273 K to 673 K at pressures up to 110 MPa. The overall uncertainty of the proposed correlation, estimated as the combined expanded uncertainty with a coverage factor of 2, varies from 1 % for the viscosity at atmospheric pressure to 5 % for the highest temperatures and pressures of interest. Tables of the viscosity, generated by the relevant equations, at selected temperatures and pressures, and along the saturation line, are provided.-2 -7. Comparison of the experimental liquid viscosity data at high pressure at nominal temperature of 373 K. 8. Comparison of the experimental liquid viscosity data with the date of Thorpe and Rodger. 9. Percentage deviations [100(η exp -η corr )/η exp ] of the primary experimental viscosity data in the liquid region from the values calculated by Eqs. (1) -(6). 10. Percentage deviations [100(η exp -η corr )/η exp ] of the primary experimental viscosity data measured at 0.1 MPa from the calculated values using Eqs. (1) -(6). 11. Viscosity of o-xylene as a function of density along a couple of isotherms.12. The extent of the viscosity representation and its estimated uncertainty.13. Percentage deviations [100(η exp -η corr )/η exp ] of the selected secondary experimental viscosity data measured at 0.1 MPa from the calculated values using Eqs. ( 1) -( 6).14. Percentage deviations [100(η exp -η corr )/η exp ] of the selected secondary experimental viscosity data at high pressures from the calculated values using Eqs. ( 1) -( 6). IntroductionThere is a growing industrial need to establish reference values of thermophysical properties of pure fluids that are both accurate and thermodynamically consistent. 1 Not only are such values useful in their own right, but they also serve as the starting point for the prediction of thermophysical properties of mixtures. For thermodynamic properties the reference values are obtained by recourse to substance-specific equation of state (EoS) that provides a general framework to correlate the measured properties and ensures thermodynamic consistency. For transport properties no such general framework is available and one develops separate correlations for different transport properties. Under the auspices of International Union of Pure and Applied Chemistry (IUPAC), a research program has been initiated to develop representations of the viscosity and thermal conductivity of industrially important fluids. The first fluid studied in this program was carbon dioxide 2 and since then a plethora of viscosity correlations have been produced, using the same philosophy, covering among others: simple fluids, 3-5 water 6, normal alkanes 7-14 and cyclic and aromatic hydrocarbons. [15][16][17][18][19] The present study is a continuation of recent work on xylene isomers that has so far produced the ...

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New Interpretation of Glass Formation in Isomeric Substances: Shifting from Melting‐Point to Melting‐Entropy

Ren

Zhang

et al. 2023

Advanced Science

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Revealing the critical thermodynamic parameters determining the glass formation of substances is of great significance for understanding the glass transition and guiding the composition design of glass‐forming materials. Nevertheless, the direct access to glass‐forming ability (GFA) by thermodynamics for various substances remains to be substantiated. The strategy to seek the fundamental properties of glass formation is explored several decades ago, as pioneered by Angell, arguing that the GFA in isomeric xylenes depends on the low lattice energy manifested by the low melting point. Here, an in‐depth study is advanced using two more isomeric systems. Surprisingly, the results do not constantly support the reported relationship between the melting point and glass formation among isomeric molecules. Instead, molecules with enhanced glass formability are featured by the properties of low melting entropy without exception. Comprehensive studies of isomeric molecules find that the low melting entropy is roughly accompanied by the low melting point, explaining the apparent link between melting point and glass formation. Progressively, the viscosity measurements of the isomers uncover a strong dependence of the melting viscosity on melting entropy. These results emphasize the significance of the melting entropy in governing the glass formability of substances.

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Viscosity measurements of ortho -xylene, meta -xylene, para -xylene and ethylbenzene

Cited by 13 publications

References 28 publications

Reference Correlation of the Viscosity of Ethylbenzene from the Triple Point to 673 K and up to 110 MPa

Reference Correlation of the Viscosity of Ethylbenzene from the Triple Point to 673 K and up to 110 MPa

Reference Correlation of the Viscosity of ortho-Xylene from 273 to 673 K and up to 110 MPa

New Interpretation of Glass Formation in Isomeric Substances: Shifting from Melting‐Point to Melting‐Entropy

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