Liquid-liquid-vapor phase equilibrium behavior of binary xenon + 1-alkanol mixtures

Gricus, Tiffany A.; Luks, Kraemer D.; Patton, Christi L.

doi:10.1016/0378-3812(95)02689-c

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…The majority of the presently known homologous series of binary systems exhibit similar patterns of global phase behavior, which can be divided into two groups. In the series that belong to the first group, for example, ethane− n -alkanols, xenon− n -alkanols, etc., the decreasing asymmetry of the system causes a shrinking of the LLVE range until a certain minimum and then it increases again. In other words, phase behavior in such series usually changes from type III to type V (IV) and then turns again to type III (according to the classification of van Konynenburg and Scott).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Liquid−Liquid−Vapor Equilibria in Binary Mixtures of n-Alkanes

Polishuk

Wisniak

Segura

2004

Ind. Eng. Chem. Res.

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This study tests the ability of the best presently available semipredictive models, namely, predictive Soave-Redlich-Kwong (PSRK), linear combination of Vidal mixing rules (LCVM), and the novel global phase diagram approach (GPDA), to estimate the three-phase liquid-liquidvapor equilibrium (LLVE) in the homologous series methane-n-alkanes, ethane-n-alkanes, propane-n-alkanes, and n-butane-n-alkanes. It is demonstrated that at high pressures G E mixing rules predict the wrong shape of the liquid-liquid critical curves, which involves fictitious closed loops of liquid-liquid equilibrium. Such a behavior is responsible for predicting nonrealistic three-phase LLVE behavior along the homologous series under consideration. In addition, both PSRK and LCVM fail in estimating the lower critical end-point curve. The results presented here for the G E -based models under consideration are probably characteristic for them. In contrast, GPDA is consistent in the entire thermodynamic phase space and does not predict nonphysical results. Although GPDA tends to underestimate the temperatures of the end points and to overestimate the double critical end points, its results are at least qualitatively accurate.

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Section: Introductionmentioning

confidence: 99%

Estimation of Liquid−Liquid−Vapor Equilibria in Binary Mixtures of n-Alkanes

Polishuk

Wisniak

Segura

2004

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…For instance, mixtures of perfluorocarbons with normal hydrocarbons display the same liquid-liquid immiscibility that would occur in mixtures of xenon with perfluorocarbons, if solidification did not prevail. 7 Further examples of the similarity between xenon and the nalkanes in terms of phase equilibria, can be found in mixtures with alcohols, 11 namely methanol. Mixtures of ethane, propane and n-butane with methanol show type V phase behaviour in the scheme of Scott and van Konynenburg, 12 while methane displays type III phase behaviour.…”

Section: Introductionmentioning

confidence: 99%