Infinite-dilution activity for alkanals, alkanoates, alkanes, and alkanones in 4-methyl-2-pentanone

Arnold, David W.; Greenkorn, Robert A.; Chao, Kwang Chu

doi:10.1021/je00047a028

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…It is a reliable but time-consuming technique. Gas-liquid chromatography (GLC) has been used extensively to obtain the activity coefficients at infinite dilution (Littlewood et al, 1955;Everett and Stoddart, 1961;Conder and Young, 1979;Arnold et al, 1987;Ferreira et al, 1987;Vega and Coca, 1991), but a limitation of the technique is that the liquid phase (solvent) must have a low volatility in order to avoid the entrainment of the stationary phase. This problem can be overcome, at least to some extent, by a combination of GLC and…”

Section: Introductionmentioning

confidence: 99%

Solvent Selection for Cyclohexane−Cyclohexene−Benzene Separation by Extractive Distillation Using Non-Steady-State Gas Chromatography

Vega

Dı́ez

Esteban

et al. 1997

Ind. Eng. Chem. Res.

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The infinite-dilution activity coefficients of cyclohexane, cyclohexene, and benzene in N,N-dimethylformamide, N-methylpyrrolidone, N,N-dimethylacetamide, phenyl acetate, and dimethyl malonate have been determined at temperatures ranging from 40 to 80 °C, by non-steady-state gas chromatography. From these data, the limiting selectivity−solvency properties for cyclohexane−benzene, cyclohexene−benzene, and cyclohexane−cyclohexene, in the presence of the aforementioned solvents, are studied, and the solvents tested are considered for the cyclohexane−cyclohexene−benzene separation by extractive distillation. According to the results, N,N-dimethylacetamide seems to be an adequate solvent for the cyclohexane−benzene and cyclohexene−benzene separations. The separation of cyclohexane−cyclohexene is the most difficult, in spite of the difference of boiling points, much higher than for cyclohexane−benzene.

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Section: Introductionmentioning

confidence: 99%

Solvent Selection for Cyclohexane−Cyclohexene−Benzene Separation by Extractive Distillation Using Non-Steady-State Gas Chromatography

Vega

Dı́ez

Esteban

et al. 1997

Ind. Eng. Chem. Res.

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“…Vapor–liquid equilibrium (VLE) data are necessary to characterize the blending of normal hydrocarbon and oxygenated hydrocarbon mixtures with different thermophysical behaviors for process design. This information is limited in the literature, especially for C6–C9 alkanes with C5 and C6 ketones, − with little data available for the reported mixture combinations in this study (one isobaric study at 100 kPa by Marrufo et al). For this reason, VLE data measurements and data regression were performed for the binary mixtures of n -hexane (1) + pentan-2-one (2)/4-methylpentan-2-one (2) at approximately T = 313.3, 323.3, and 333.5 K. These temperatures were selected to maintain n -hexane within its normal boiling point and for practical and economic purposes such as maintaining process design limits within atmospheric pressure so that normal cooling water utilities can be suitably employed in the potential separation process with an approach of 12–20 K. − The experimental data were modeled using the combined γ–Φ method, with the nonrandom two-liquid (NRTL) and universal quasi-chemical (UNIQUAC) activity coefficient models, and with the Hayden and O’Connell correlation for the virial equation-of-state parameters.…”

Section: Introductionmentioning

confidence: 89%

Isothermal Vapor–Liquid Equilibrium (P–x–y) Measurements and Modeling of n-Hexane + Pentan-2-one/4-Methylpentan-2-one

2020

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Isothermal vapor−liquid equilibrium (VLE) data were measured for the hexane + pentan-2-one/4-methylpentan-2-one systems to characterize the separation limits. Phase equilibrium measurements were undertaken at approximately 313, 323, and 334 K at subatmospheric pressures using a dynamic apparatus. The γ−Φ regression approach was used with the nonrandom twoliquid or UNIQUAC activity coefficient models employed to account for the nonideality of the liquid phase, with the Hayden and O'Connell correlation in the virial equation of state, used to account for the vapor phase nonideality. Additionally, the data were modeled by the φ−φ approach with the Peng− Robinson and perturbed-chain statistical associating fluid theory equations of state, which exhibited an inferior performance in comparison to the modeling by the γ−Φ approach. The area and point thermodynamic consistency tests were applied to the data and showed that the measured data were thermodynamically consistent. Excess enthalpy predictions were found to correlate well with the available literature.

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“…It is a reliable but time-consuming technique. Gas−liquid chromatography (GLC) has been used extensively to obtain the activity coefficients at infinite dilution, − but a limitation of this technique is that the liquid phase (solvent) must have a low volatility in order to avoid the entrainment of the stationary phase. This problem can be overcome, at least to some extent, by a combination of GLC and liquid−liquid chromatography (LLC), using a high-molecular-weight compound as the liquid phase in both techniques. , Vega and Coca 9 have recently reviewed these chromatographic techniques.…”

Section: Introductionmentioning

confidence: 99%

Activity Coefficients for Cyclohexane, Cyclohexene, and Benzene in Extractive Distillation Solvents Using Non-Steady-State Gas Chromatography

et al. 2000

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The infinite-dilution activity coefficients of cyclohexane, cyclohexene, and benzene in four solvents, isophorone (CAS 78-59-1), dimethyl sulfoxide (CAS 67-68-5), dimethyl succinate (CAS 106-65-0), and propylene glycol (CAS 57-55-6), have been determined at temperatures ranging from 40 °C to 80 °C, by non-steady-state gas chromatography. These solvents are used commercially in the separation of mixtures of these hydrocarbons by extractive distillation, so infinite-dilution selectivities have been calculated and studied in relation to this separation. The experimental activity coefficients were compared with those calculated by the UNIFAC method.

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Infinite-dilution activity for alkanals, alkanoates, alkanes, and alkanones in 4-methyl-2-pentanone

Cited by 4 publications

References 9 publications

Solvent Selection for Cyclohexane−Cyclohexene−Benzene Separation by Extractive Distillation Using Non-Steady-State Gas Chromatography

Solvent Selection for Cyclohexane−Cyclohexene−Benzene Separation by Extractive Distillation Using Non-Steady-State Gas Chromatography

Isothermal Vapor–Liquid Equilibrium (P–x–y) Measurements and Modeling of n-Hexane + Pentan-2-one/4-Methylpentan-2-one

Activity Coefficients for Cyclohexane, Cyclohexene, and Benzene in Extractive Distillation Solvents Using Non-Steady-State Gas Chromatography

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