Thermodynamic Properties ofo-Xylene,m-Xylene,p-Xylene, and Ethylbenzene

Abstract

Equations of state for the xylene isomers (o-xylene, m-xylene, and p-xylene) and ethylbenzene have been developed with the use of the Helmholtz energy as the fundamental property with independent variables of density and temperature. The general uncertainties of the equations of state are 0.5% in vapor pressure above the normal boiling point, and increase as the temperature decreases due to a lack of experimental data. The uncertainties in density range from 0.1% in the liquid region to 1.0% elsewhere (the critical and vaporphase regions). The uncertainties in properties related to energy (such as heat capacity and sound speed) are estimated to be 1.0%. In the critical region, the uncertainties are higher for all properties. The behavior of the equations of state is reasonable within the region of validity and at higher and lower temperatures and pressures. Detailed analyses between the equations and experimental data are reported.

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

“…The use of EOS-generated density, rather than the one reported as part of the viscosity measurements, provides an additional level of consistency and further reduces the uncertainty of the developed viscosity correlation. For the purposes of this work, we have used a recent EOS developed by Zhou et al 17 that covers the thermodynamic space from the triple point to 700 K and up to 200 MPa. Uncertainties in density are estimated to be ±0.2% in the liquid region and ±1.0% elsewhere.…”

“…All the viscosity data were converted from the η(T, P) to η(T, ρ) representation by means of the recent EOS of Zhou et al 17 The residual viscosity was generated by subtracting from each data point the zero-density value, Eqs. (2) and (3), and the initial-density contribution, Eq.…”

“…The thermodynamic properties are well catered for by an up-to-date EOS, 17 while the thermal conductivity correlation has also become recently available. 18 At present, no correlation of viscosity, valid over a wide range of temperature and pressure, is available and if one wants to predict the viscosity of p-xylene, one has to rely on generic correlations 19,20 developed for a wide variety of fluids that have invariably traded the range of applicability for accuracy.…”

Comparative study of vapour-liquid equilibrium and density modelling of mixtures related to carbon capture and storage with the SRK, PR, PC-SAFT and SAFT-VR Mie equations of state for industrial uses

“…This comparative analysis has included a large number of experimental data sets collected from the literature. All data sets collected are included in the NIST Databases [36] [37]. However, many of the PVT data collected have not been used in order to avoid wrong calculations (i.e.…”

“…Therefore, 26479 single phase density (PTρx) literature data were collected from NIST standard reference database [37], even though it is worth noting that the data used for the mixture with long-chain alkanes are saturated liquid density data points. The density data of 57 binary mixtures of CO 2 , CH 4 , C 2 H 6 , N 2 and H 2 S with alkanes, gases and toluene were modelled with the SRK, PR, PC-SAFT and SAFT-VR Mie equation of state, as well as using the Peneloux volume correction coupled with CEoS.…”