Influence of temperature on thermodynamics of ethanol + hydrocarbon gasoline additives

Gonzalez-Olmos, Rafael; Iglesias, M.; Mattedi, Silvana

doi:10.1080/00319100902894223

Cited by 14 publications

(10 citation statements)

References 21 publications

(27 reference statements)

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“…Figure shows a comparison of the excess molar volumes of 2,2,4-trimethylpentane + ethanol, + 1-propanol, + 1-butanol, + 1-pentanol, + 1-hexanol, and + 1-heptanol mixtures as functions of the mole fraction of 2,2,4-trimethylpentane at 313.15 K. We can see that the excess molar volume decreases as the length of the alcohol chain increases, and it changes from a positive curve for the ethanol mixtures to a sigmoidal curve with positive and negative values for the 1-heptanol mixtures. The magnitude of V E for the six systems follows the order ethanol > 1-propanol > 1-butanol > 1-pentanol > 1-hexanol > 1-heptanol.…”

Section: Resultsmentioning

confidence: 99%

Densities and Viscosities of Binary Mixtures of 2,2,4-Trimethylpentane + 1-Propanol, + 1-Pentanol, + 1-Hexanol, and + 1-Heptanol from (298.15 to 323.15) K

Wang

Song

2015

J. Chem. Eng. Data

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Experimental density and viscosity data for binary mixtures of 2,2,4-trimethylpentane with 1-propanol, 1-pentanol, 1-hexanol, and 1-heptanol at atmospheric pressure over the entire composition range at temperatures from (298.15 to 323.15) K are reported. Excess molar volumes and viscosity deviations of the mixtures were calculated from the experimental data and correlated using the Redlich–Kister equation. The optimized sets of parameters of the equation at each temperature were obtained by the least-squares method.

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Section: Resultsmentioning

confidence: 99%

Densities and Viscosities of Binary Mixtures of 2,2,4-Trimethylpentane + 1-Propanol, + 1-Pentanol, + 1-Hexanol, and + 1-Heptanol from (298.15 to 323.15) K

Wang

Song

2015

J. Chem. Eng. Data

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“…The application was tested on a set of 270 zeotropic and azeotropic systems of homogeneous binary solutions and 30 non‐homogeneous systems. In addition to the VLE data, values of the excess properties ( v E and h E ) have been used and, also, LLE data of the system studied, extracted from the literature,…”

Section: Results Of the Testmentioning

confidence: 99%

A rigorous method to evaluate the consistency of experimental data in phase equilibria. Application to VLE and VLLE

2017

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This work forms part of a broader study that describes a methodology to validate experimental data of phase equilibria for multicomponent systems from a thermodynamic‐mathematical perspective. The goal of this article is to present and justify this method and to study its application to vapor–liquid equilibria (VLE) and vapor–liquid–liquid equilibria (VLLE), obtained under isobaric/isothermal conditions. A procedure based on the Gibbs‐Duhem equation is established which presents two independent calculation paths for its resolution: (a) an integral method and (b) a differential method. Functions are generated for both cases that establish the verification or consistency of data, δψ for the integral test and δζ for the differential approach, which are statistically evaluated by their corresponding average values [ δtrueψ¯, δtrueζ¯], and the standard deviations [ strue(δψtrue), strue(δζtrue)]. The evaluation of these parameters for application to real cases is carried out using a set of hypothetical systems (with data generated artificially), for which the values are adequately changed to determine their influence on the method. In this way, the requirements of the proposed method for the data are evaluated and their behavior in response to any disruption in the canonical variables (p,T, phase compositions). The conditions for thermodynamic consistency of data are: δtrueψ¯<2, strue(δψtrue)<0.2, δtrueζ¯<5, and s(δξ)<0.2. In systems with VLLE, in addition to the previous criteria, must occur that: δxLLE<0.05 and δTLLE<0.5 K. The new proposed method has been tested with a set of 300 experimental binary systems, biphasic and triphasic, obtained from published bibliography, and the results are compared with those of other tests commonly used for testing thermodynamic consistency. The results show that the greater rigor of the proposed method is mainly due to the simultaneous verification of various independent variables. As a result, the conditions for the new test are verified for fewer systems than using other tests mentioned in the literature (i.e., Fredenslund‐test and direct of Van Ness). Its unique application is sufficient to ensure the consistency of experimental data, without using other tests. © 2017 American Institute of Chemical Engineers AIChE J, 2017

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“…Variation of V E with x i at (a) T = 298.15 K and (b) T = 318.15 K for the binary systems: ethanol (1) + methylbenzene (2), x i = x 1 , (○) this work, (▲) Moravkova et al, (●) Gonzalez-Olmos et al, (▽) Atik, (◇) Pardo et al; ethanol (1) + 2-methyl-2-propanol (3), x i = x 1 , (△) this work, (■) Wang et al; methylbenzene (2) + 2-methyl-2-propanol (3), x i = x 2 , (□) this work, (⧫) Peña et al The solid lines are calculated from the Redlich–Kister equation.…”

Section: Resultsmentioning

confidence: 91%

“…In the past, referring to the ThermoLit of NIST, 8 the densities were measured by Ogiwara et al 9 and Gonzalez-Olmos et al 10 at T = 298.15 K and Moravkova et al 11 at T = 318.15 K for ethanol + methylbenzene. The experimental densities and viscosities at T = 298.15 and 318.15 K were reported by Wang et al 12 for ethanol + 2-methyl-2-propanol.…”

Section: ■ Introductionmentioning

confidence: 99%

Densities, Viscosities, and Correlations for the Ternary System of Ethanol + Methylbenzene + 2-Methyl-2-propanol and Its Binary Subsystems at T = 298.15 and 318.15 K

Lai

2016

J. Chem. Eng. Data

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Densities and viscosities of the ternary system (ethanol + methylbenzene + 2-methyl-2-propanol) and its binary subsystems were measured at T = 298.15 and 318.15 K and atmospheric pressure. Densities were determined using a vibrating-tube densimeter. Viscosities were found with an automatic microviscometer based on the rolling ball principle. From the experimental data, the excess molar volumes (V E ) and deviations in viscosity (Δη) were derived. The binary V E and Δη data were correlated with the Redlich−Kister equation. The ternary V E and Δη data were fitted to the equation based on Cibulka and the equation of Singh et al., respectively. The values of V E and Δη were used to discuss the nature of mixing behaviors for the mixtures, and leading to these excess values is perhaps due to the complex formation and/or accommodation between molecules. To describe the ternary system, several mixtures with specially designated concentrations of 2-methyl-2-propanol were considered.

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Influence of temperature on thermodynamics of ethanol + hydrocarbon gasoline additives

Cited by 14 publications

References 21 publications

Densities and Viscosities of Binary Mixtures of 2,2,4-Trimethylpentane + 1-Propanol, + 1-Pentanol, + 1-Hexanol, and + 1-Heptanol from (298.15 to 323.15) K

Densities and Viscosities of Binary Mixtures of 2,2,4-Trimethylpentane + 1-Propanol, + 1-Pentanol, + 1-Hexanol, and + 1-Heptanol from (298.15 to 323.15) K

A rigorous method to evaluate the consistency of experimental data in phase equilibria. Application to VLE and VLLE

Densities, Viscosities, and Correlations for the Ternary System of Ethanol + Methylbenzene + 2-Methyl-2-propanol and Its Binary Subsystems at T = 298.15 and 318.15 K

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