Densities, refractive indices, and derived excess properties of {x1CH3COOCH3+x2CH3OH+(1−x1−x2)CH3CH(OH)CH3} at the temperature 298.15 K

Canosa, J.; Rodríguez, Ana; Iglesias, M.; Orge, B.; Tojo, J.

doi:10.1006/jcht.1997.0214

Cited by 13 publications

(3 citation statements)

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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

View full text Add to dashboard Cite

show abstract

“…The parameters A i j , B p , and C i from equations (1), (4), and (5), and corresponding root-meansquare deviations are given in table 4. A least-squares analysis was used to fit the polynomial with the data, using binary contributions expressed by equation (4). Curves of constant V E m and δn D {equation (5)} have been plotted in figures 3(a) and 3(b), respectively.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

“…In order to assess the advantages of aliphatic alcohols as solvents in the separation of binary azeotropes by extractive rectification processes, the determination of physical properties is required in order to analyse the composition of products in a rectification system and to understand the molecular interactions between solvent and azeotropic components. Continuing our research in thermodynamic properties of organic mixtures, (1)(2)(3)(4) we present densities and refractive indices at T = 298.15 K of (acetone + methanol + 2-butanol), and the binary systems (acetone + 2-butanol) and (methanol + 2-butanol), as well as the corresponding derived excess molar volumes and changes of refractive indices on mixing. These excess properties will be compared with the results computed by different estimation methods.…”

Section: Introductionmentioning

confidence: 99%