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Langa E.,University of Lisbon | Palavra A.M.F.,Superior Technical Institute | Nieto De Castro C.A.,University of Lisbon | Mainar A.M.,University of Zaragoza
Journal of Chemical Thermodynamics | Year: 2012

The density, ρ, and two derived properties, isothermal compressibility, κ T, and the coefficient of cubic expansion, α P, were obtained for the mixtures of 1-methyl-4-(1- methylethenyl)-cyclohexene, known as limonene, and (1S,5S)-6,6-dimethyl-2- methylenebibyclo[3.1.1]heptane, known as β-pinene, for nine different compositions and the pure components at five pressures from 20 MPa to 40 MPa and six temperatures from 283.15 K to 358.15 K. The experimental uncertainty for ρ, κ T, and α P were respectively ±0.5 kg·m -3, ±14 TPa -1, and ±0.005k K -1, with k = 2 for all of them. Density behaviour with temperature and pressure was as expected. The values of α P and κ T increase with temperature and decrease with increasing pressure. Two different equations of state, conventional SAFT and PC-SAFT, were applied to predict the densities of the mixture. The best predictions were achieved with PC-SAFT. © 2011 Elsevier Ltd. All rights reserved. Source


Langa E.,University of Lisbon | Palavra A.F.,Superior Technical Institute | Castro C.A.,University of Lisbon | Mainar A.M.,University of Zaragoza
Journal of Chemical and Engineering Data | Year: 2011

The density of the binary system 1-methyl-4-(1-methylethenyl)-cyclohexene (limonene) + (1S,5S)-2,6,6-trimethylbicyclo[3.1.1]hept-2-ene (α-pinene) has been measured for nine different compositions and the pure components at five pressures from (20.0 to 40.0) MPa and six temperatures from (283.15 to 358.15) K with a vibrating-tube densimeter. The experimental uncertainty is estimated to be ± 0.5 kg·m-3. The isothermal compressibility and isobaric thermal expansion were derived from the experimental density data. Two different equations of state, conventional SAFT and PC-SAFT, were applied to predict the densities of the mixture. The best predictions were achieved with PC-SAFT. © 2011 American Chemical Society. Source

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