Density and Viscosity of Decalin, Cyclohexane, and Toluene Binary Mixtures at (283.15, 293.15, 303.15, 313.15, and 323.15) K

Abstract

Densities and viscosities for three binary systems, cyclohexane + toluene, cyclohexane + decalin, and toluene + decalin, at T = (283.15, 293.15, 303.15, 313.15, and 323.15) K have been measured over the whole composition range and atmospheric pressure along with the properties of the pure components. Viscosities deviations and excess molar volumes for the binary systems at the above-mentioned temperatures were calculated from experimental data and fitted to the Redlich−Kister expansion. In addition, the Prigogine−Flory−Patterson (PFP) model was used to correlate experimental density data. The Redlich−Kister expansion well correlated viscosity deviation and excess volume values. Shape and length asymmetries and molecular interaction asymmetries impact on viscosity deviations, but the latter had a more pronounced influence. Negative excess molar volumes were found when only shape and length asymmetries were present, while molecular interaction asymmetries led to positive values. The effects of simultaneous molecular interaction and length asymmetries were somehow additive for excess volume. The Prigogine−Flory−Patterson model well correlates density data and predicts qualitatively the excess molar volumes, but does not predict the temperature dependence on this property. Moreover, the results lead to the conclusion that the model fails when the molecular interaction term is omitted, even when the system presents only shape and length asymmetries.

Numerical Simulation of Structure Formation of Surface-Modified Nanoparticles during Solvent Evaporation

“…The physical constants for CeO 2 nanoparticles (Kanchana et al, 2006), solvent (Jasper, 1972;Barton, 1983;Silva et al, 2009;Tisserand et al, 2009), and modifiers (Barton, 1983) are listed in Tables 1 to 3, respectively. The temperature is 300 K. The frictional coefficients between two nanoparticles and between a nanoparticle and a substrate are respectively assumed to be 0.02 and 0.2 for lack of available data.…”

Medida Experimental E Modelagem Termodinâmica Da Massa Específica E Da Velocidade Do Som Em Altas Pressões Para O Sistema Decalina+n-Hexadecano

“…Os reagentes utilizados nos experimentos foram: n-hexadecano fornecido pela VETEC Química, com teor mínimo em massa de 99,0% e decalina (decahidronaftaleno) fornecido pela VETEC Química, com dosagem mínima em massa de 99,0% da mistura dos isômeros -41% (massa) do isômero cis e 59% (massa) do isômero trans (Silva et al, 2009). Os produtos químicos usados não sofreram tratamento de purificação prévio.…”

“…Desta forma, estudos de velocidade do som e massa específica a pressões elevadas, de misturas binárias de decalina e n-hexadecano podem ser utilizados para simular propriedades das frações de querosene e diesel. Estas substâncias são assimétricas em tamanho, forma e natureza química, o que leva a crer que a mistura binária destes compostos não apresenta comportamento de solução ideal (Silva et al, 2009;Paredes et al, 2011).…”

Predicting the Viscosity of Hydrocarbon Mixtures and Diluted Heavy Oils Using the Expanded Fluid Model

“…Viscosity and density literature data (Al-Gherwi et. al., 2006;Baylaucq et al, 1997aBaylaucq et al, , 1997bBonet et al, 2003;Canet et al, 2001;Dauge et al, 1999;Iloukhani and Rezaei-Sameti, 2005;Nhaesi and Asfour, 2005;Queimada et al, 2003;Silva et al, 2009;Wang et al, 2007 ) for 8 binaries, 8 multi-component hydrocarbon mixtures (with the number of components ranging between 3 and 6) were included in the test dataset (772 data points). These mixtures featured asymmetric components and included data at temperatures from 20 to 80°C and pressures up to 100 MPa.…”