Vapor-Liquid Equilibria of Methanol + Hexane, Methanol + Heptane, Ethanol + Hexane, Ethanol + Heptane, and Ethanol + Octane at 298.15 K

Hongo, Motoyoshi; Tsuji, T.; Fukuchi, Kenji; Arai, Yasuhiko

doi:10.1021/je00016a010

Cited by 36 publications

(24 citation statements)

References 12 publications

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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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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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“…The values of binary parameters a ij and b ij are shown in Table . The extended and modified UNIQUAC models were fitted to the experimental data − using a calculation program by Prausnitz et al The binary parameters, for the methanol–EMC, ethanol–EMC, and EMC–heptane, were obtained by the regression of the measured LLE data for the water + methanol + EMC, water + ethanol + EMC and water + EMC + heptane.…”

Section: Calculated Results and Discussionmentioning

confidence: 99%

“…The extended and modified UNIQUAC models , were used to correlate the measured LLE data. The vapor–liquid equilibrium (VLE) data were needed to get the binary parameters for completely miscible binary systems. − and mutual solubility data were used to get the binary parameters for the immiscible binary systems . In this research, the ternary parameters obtained from the systems of water + methanol + heptane, water + methanol + heptane, water + EMC + methanol, water + EMC + ethanol, and water + EMC + heptane are needed to correlate well quaternary LLE.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Correlation of Liquid–Liquid Equilibrium for Quaternary Systems of Water + Methanol or Ethanol + Ethyl Methyl Carbonate + Heptane at 25 °C

et al. 2017

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In this work, liquid phase compositions for mixtures of water + methanol + ethyl methyl carbonate (EMC) + heptane, water + ethanol + EMC + heptane, and water + methanol + EMC, water + ethanol + EMC, and water + EMC + heptane at 25 °C were measured at atmospheric pressure. The modified UNIQUAC activity coefficient model was employed to correlate the experimental tie-line data, and the results were compared with ones obtained with the extended UNIQUAC model. The consistency of the measured tie-line data was ascertained by applying the Othmer–Tobias equation.

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“…A number of isothermal VLE data have been reported in the literature for the methanol + n-heptane binary system. Isobaric VLE data of this system are very limited as most of the studies present data that are isothermal and limited to only one temperature: Hongo et al 4 measured the VLE of methanol + hexane, methanol + heptane, ethanol + hexane, ethanol + heptane, and ethanol + octane by a flow-type apparatus at 298.15 (K). Kammerer et al 5 reported the thermodynamic excess properties and VLE data of several binary and ternary mixtures containing methanol, tert-amyl methyl ether, and an alkane by an analytical method at 313.15 (K).…”

Section: Introductionmentioning

confidence: 99%

Experimental Vapor–Liquid Equilibria and Thermodynamic Modeling of the Methanol + n-Heptane and 1-Butanol + Aniline Binary Systems

2018

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Isobaric vapor–liquid equilibria (VLE) of the binary systems of methanol + n-heptane and 1-butanol + aniline were measured at 85 kPa. The experiments were carried out using an Othmer still with the objective of measuring the equilibrium temperature, as well as the composition of the vapor and liquid phases as determined by gas chromatography analysis. According to the experimental results obtained, both of the binary mixtures studied demonstrate positive deviation from ideal behavior. Furthermore, a point of minimum-boiling azeotrope was observed for the methanol + n-heptane system. The VLE data measured have been verified to be thermodynamically consistent based on the Wisniak modification of the Herington area test for isobaric VLE data. Additionally, the two systems were thermodynamically modeled. Because of the relatively low pressure involved in this work, the modified Raoult’s law was utilized for this purpose. In this regard, the experimental vapor–liquid equilibrium data were correlated with different excess Gibbs energy models, including the Wilson, the nonrandom two-liquid (NRTL), and the universal quasi-chemical (UNIQUAC) activity coefficient models. The results obtained show reasonably good agreement with the experimental data.

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Vapor-Liquid Equilibria of Methanol + Hexane, Methanol + Heptane, Ethanol + Hexane, Ethanol + Heptane, and Ethanol + Octane at 298.15 K

Cited by 36 publications

References 12 publications

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

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

Measurement and Correlation of Liquid–Liquid Equilibrium for Quaternary Systems of Water + Methanol or Ethanol + Ethyl Methyl Carbonate + Heptane at 25 °C

Experimental Vapor–Liquid Equilibria and Thermodynamic Modeling of the Methanol + n-Heptane and 1-Butanol + Aniline Binary Systems

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