Vapor phase viscosity of toluene and p-xylene

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

Section: -7supporting

confidence: 63%

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

Meng

Cao

et al. 2017

“…The temperature dependence of the reduced second viscosity virial coefficient

B_{η}^{*} (T^{*})

was theoretically calculated for the Lennard-Jones 12-6 potential by Rainwater and Friend 90, 91 and later adjusted to experimental results by Vogel and Hendl. 92 An accurate and wide-ranging correlation of their results was published by Vogel et al . 24 and adopted in this work.…”

Section: Formulation Conceptmentioning

confidence: 81%

Reference Correlation for the Viscosity of Carbon Dioxide

Laesecke

Muzny

2017

109

A comprehensive database of experimental and computed data for the viscosity of carbon dioxide (CO2) was compiled and a new reference correlation was developed. Literature results based on an ab initio potential energy surface were the foundation of the correlation of the viscosity in the limit of zero density in the temperature range from 100 K to 2000 K. Guided symbolic regression was employed to obtain a new functional form that extrapolates correctly to T → 0 K and to 10 000 K. Coordinated measurements at low density made it possible to implement the temperature dependence of the Rainwater-Friend theory in the linear-in-density viscosity term. The residual viscosity could be formulated with a scaling term ργ/T the significance of which was confirmed by symbolic regression. The final viscosity correlation covers temperatures from 100 K to 2000 K for gaseous CO2, and from 220 K to 700 K with pressures along the melting line up to 8000 MPa for compressed and supercritical liquid states. The data representation is more accurate than with the previous correlations, and the covered pressure and temperature range is significantly extended. The critical enhancement of the viscosity of CO2 is included in the new correlation.

“…Based on these criteria, 11 datasets were considered primary data. Table 1 summarizes the primary data 27,30,31,35,38,39,41,50,54,57,58 detailing the temperature and pressure ranges, the authors' claimed uncertainty and purity of the sample, and the technique employed to perform the measurements. The choice of primary data is discussed in more detail in Sec.…”

Section: Experimental Viscosity Datamentioning

confidence: 99%

Reference Correlation of the Viscosity of para-Xylene from the Triple Point to 673 K and up to 110 MPa

Balogun

Riesco

Vesovic

2015

A new correlation for the viscosity of para-xylene (p-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 the triple point 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 0.5% for the viscosity of the dilute gas 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.