Liquid Densities of Xylene Isomers and 2-Methylnaphthalene at Temperatures to 523 K and Pressures to 265 MPa: Experimental Determination and Equation of State Modeling

Abstract

Experimental density data for o-xylene, m-xylene, p-xylene, and 2-methylnaphthalene, are reported at pressures (P) to 265 MPa and temperatures (T) to 525 K using a variable-volume, high-pressure cell. The reported data agree to within ±0.4% of available literature data. o-Xylene has the largest densities and p-xylene has the smallest densities in the P–T range investigated in this study although the 525 K isotherms for all three aromatics virtually superpose at high pressures. The aromatic densities are modeled using the Peng–Robinson (PR), high-temperature, high-pressure, volume-translated Peng–Robinson (HTHP VT-PR), and perturbed chain statistical associating fluid theory (PC-SAFT) equations of state (EoS). Generally, the PC-SAFT EoS gives the best predictions of the HTHP density data with mean absolute percent deviations (δ) within 1.0%, even though the pure-component parameters are fitted to low-pressure vapor pressure and saturated liquid density data. δ decreases to 0.4% for calculations with a new set of PC-SAFT parameters obtained from a fit of the HTHP experimental density data obtained in this study.

High-pressure densities of n-decane+o-xylene mixtures: Measurement and modelling

“…The absolute average relative deviation between the literatures and calculations from Eq. 1 is less than 0.2 % except for the data of Wu et al11 However, the uncertainty reported by Wu et al is 0.75 %, therefore, the experimental data reported by Wu et al agree well with our results.…”

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

“…In this work we have used Zhou et al 20 EoS to generate the densities of o-xylene up to 673 K and 110 MPa, which is the upper temperature and pressure limit of the primary data summarized in Table 1. We note that the use of Wu et al 96 measured density values, instead of those calculated by EoS, would result in changes in viscosity of up to 6%. As expected the sensitivity is highest at the largest values of density.…”

“…The uncertainties in density generated by this EoS range from 0.1 % in the compressed-liquid region to 1.0 % in the critical and vapor regions. 20 Recently, Wu et al 96 measured the density of o-xylene along several isotherms up to 523.2 K and at pressures up to 265 MPa, with an uncertainty of 0.75 % (at coverage factor of 2 for an interval having a confidence level of approximately 95%). The deviations of the measurements of Wu et al 96 from EoS developed by Zhou et al 20 are shown in Fig.…”

Density Measurement for the Binary Mixtures of Ionic Liquid 1-ethyl- 3-methylimidazolium Diethylphosphate and Water (Methanol or Ethanol) at 1atm and (293.15 to 333.15) K

“…The resulting parameters A 0, A 1, A 2 , B, C, and the correlation deviations in average absolute relative deviation, i.e. AARD(V E ), or mean absolute percent deviation (MAPD) as noted by McHugh et al [15,16], for each binary system are listed in Table 3. The experimental density data were accurately correlated by Eqs (5) through (8) with the maximum correlative deviation of AARD ( ) within 0.02%, which is close to the experimental uncertainty of the densimeter used here.…”