Liquid–liquid phase behaviour, liquid–liquid density, and interfacial tension of multicomponent systems at 298K

García-Flores, Blanca E.; Trejo, Arturo; Águila-Hernández, Jacinto

doi:10.1016/j.fluid.2007.04.008

Cited by 13 publications

(8 citation statements)

References 29 publications

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“…In Figure , a schematic diagram of this cell is presented. This cell is similar to that used in previous studies on liquid−liquid equilibrium from our laboratory. − The internal cell has three screw threaded tubes, two in the upper side and another at a lateral side near the bottom of the internal cell. One of the upper tubes allows the feeding of the substances under study at a given temperature, which is controlled with the aid of a Julabo F70 circulating bath using water as thermal fluid, which in turn filled completely the thermal jacket of the cell containing the system under study.…”

Section: Methodsmentioning

confidence: 99%

“…Density values were derived using the average period of vibration, which was in turn obtained from at least 20 stable measurements measured for each sample of the conjugated phases. The experimental method was reported in previous works from our laboratory. ,,− In this work, we used for the calibration of the densimeter accurate density values for five different pure substances: nitrogen, hexane, heptane, octane, and water …”

Section: Methodsmentioning

confidence: 99%

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Interfacial Tension and Density of Water + Branched Hydrocarbon Binary Systems in the Range 303−343 K

Aranda-Bravo

Romero‐Martínez

Trejo

et al. 2008

Ind. Eng. Chem. Res.

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Experimental results for the liquid-liquid interfacial tension of water + branched hydrocarbon binary systems were obtained using the pendant drop method. The branched hydrocarbons included in this study were 2-methylpentane and 3-methylpentane as structural isomers of C 6 H 14 ; 2,3-dimethylpentane as isomer of C 7 H 16 ; and 2,2,4-trimethylpentane and 2,3,4-trimethylpentane as isomers of C 8 H 18 . The temperatures at which the experiments were carried out were 303.15, 313.15, 323.15, 333.15, and 343.15 K. Density values of both saturated liquid phases were also experimentally determined. An experimental apparatus for achieving the liquid-liquid equilibrium with online sampling and density measurement was developed. Density values obtained for both saturated liquid phases follow the expected behavior with temperature: they decrease with increasing temperature, whereas the effect of the structural isomerism on density was mainly observed on the results for the hydrocarbon-rich liquid phase. Also, the interfacial tension values decrease with increasing temperature for a given water + hydrocarbon binary system and as the size of the hydrocarbon increases. Estimated values for the interfacial tension of the systems with the different branched isomers were obtained using a method developed in previous work.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Interfacial Tension and Density of Water + Branched Hydrocarbon Binary Systems in the Range 303−343 K

Aranda-Bravo

Romero‐Martínez

Trejo

et al. 2008

Ind. Eng. Chem. Res.

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“…The experimental investigation on the liquid-liquid equilibrium of the ternary system water + n-butyl acetate + 1-propanol was made in an equilibrium cell built of Pyrex glass with a total volume of 25 cm 3 , which was enough to take samples from the two equilibrium liquid phases to perform the quantification of their concentration and interfacial tension. This cell is similar to that used by Garcia-Flores et al 32 The temperature control in the equilibrium cell (up to ( 0.02 K) was achieved by means of a constant-temperature bath-circulator, Haake D8-G, which uses water as thermal fluid in the thermal jacket of the cell. The temperature was measured in the cell thermowell with a digital thermometer (Alpha Technics, model 4400) with a platinum resistance probe, whose readings have an accuracy of 0.01 K. This thermometer was certified (and calibrated in the ITS-90) by the US National Institute of Standards and Technology (NIST) following the Technology Special Publication 250-35.…”

Section: Table 1 Densities (G) Viscosities (η) and Surface Tensions (...mentioning

confidence: 99%

Liquid−Liquid Equilibria, Density, Viscosity, and Surface and Interfacial Tension of the System Water +n-Butyl Acetate + 1-Propanol at 323.15 K and Atmospheric Pressure

Costa¹,

Lourenço²,

Johnson³

et al. 2009

J. Chem. Eng. Data

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Liquid-liquid equilibrium (LLE) data are reported for the system water + n-butyl acetate + 1-propanol at 323.15 K and atmospheric pressure. The densities, viscosities, and surface tensions have been measured in the homogeneous liquid range for the binary and ternary liquid mixtures, and the liquid interfacial tensions of the conjugate phases located in the isothermal binodal curve have been determined at the same temperature and pressure. The experimental tie-line data were predicted by the UNIFAC method with good results. The empirical method of Othmer and Tobias was used for tie-line correlation, and the method of Pick et al. was applied for binodal data correlation. The molar volumes, V m , the dynamic viscosity, η, and the surface tension, γ, of the binary systems were correlated in terms of composition using rational functions. The dilute regions of these systems deserved particular attention due to the physicochemical effects taking place in these regions. To describe the ternary system, binary pair additivity and a rational function were considered for the ternary contributions. The surface tension data of binary mixtures were correlated with the models of Fu et al. and Li et al., and the same models were applied for the prediction of ternary data. The liquid interfacial tension measured for the tie-lines was correlated using the relation proposed by Li and Fu.

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“…The methanol moisture problem may be eased by using another oxygenated compound to affect the mutual hydrocarbon–water solubility in the methanol blends. − Among these oxygenated compounds, dimethyl carbonate (DMC) is of increasing importance in the chemical process industry because of its versatility as reagent and solvent as well as its low toxicity to human health and quick biodegradation in the environment . DMC has a higher oxygen content than methyl t -butyl ether or methyl t -amyl ether, has a good blending octane number for gasoline, and does not lead to phase separation in a water stream like some alcohols do.…”

Section: Introductionmentioning

confidence: 99%

“…The temperature range of this refractometer is from 283.15 K to 343.15 K with an accuracy of 0.01 K. The uncertainty of the refractive index measurement was less than ± 0.0001 units. All samples were prepared by mass in a 50 cm 3 Erlenmeyer flask provided with a joint stopper, using also the Mettler-Toledo XS 205DU balance. The possible error of liquid composition in mole fraction was within ± 1•10 −4 .…”

Section: ■ Introductionmentioning

confidence: 99%

Liquid–Liquid Equilibria, Density, Refractive Index, and Solubility for Mixtures of Water + Methanol + Heptane + Methylbenzene or + Dimethyl Carbonate at T = 298.15 K

Lin

Lai

2013

J. Chem. Eng. Data

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New liquid−liquid equilibrium (LLE) data are presented for the quaternary system of water + methanol + heptane + methylbenzene at T = 298.15 K under atmospheric conditions. The quaternary mixtures were prepared by mixing pure water, methanol, and an equimolar mixed (heptane + methylbenzene). A quinary system containing these compounds and dimethyl carbonate (DMC) was also studied at the same temperature. The quinary mixtures were obtained with three mole fractions (0.25, 0.50, and 0.75) of DMC in the binary (methanol + DMC) mixtures. The compositions of liquid phases at equilibrium were determined by gas− liquid chromatography. The consistency of the experimental LLE data has been confirmed according to the Othmer−Tobias and the Hand correlations. The water composition in the organic phase and the hydrocarbon solubility in the aqueous phase were analyzed in terms of (methanol + DMC) in the global composition. The distributions of methanol and DMC between the aqueous phase and the organic phase were also discussed. The experimental LLE data were correlated with the nonrandom two-liquid (NRTL) and the universal quasichemical activity coefficient (UNIQUAC) solution models, and the binary interaction parameters were collected. The density and refractive index at each LLE composition of each conjugate phase were measured at T = 298.15 K. Densities were determined using a vibrating-tube densimeter. Refractive indexes were measured using a digital Abbe-type refractometer. The solubility data were obtained by the cloud point method for the pseudoternary system with water (1) + (methanol + DMC) (2) + (0.50 heptane + 0.50 methylbenzene) (3) at T = 298.15 K. The system exhibited a large partially miscible region in the phase diagram of Gibbs triangle. The region of heterogeneity was found to decrease with an adequate blending of DMC with methanol.

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Liquid–liquid phase behaviour, liquid–liquid density, and interfacial tension of multicomponent systems at 298K

Cited by 13 publications

References 29 publications

Interfacial Tension and Density of Water + Branched Hydrocarbon Binary Systems in the Range 303−343 K

Interfacial Tension and Density of Water + Branched Hydrocarbon Binary Systems in the Range 303−343 K

Liquid−Liquid Equilibria, Density, Viscosity, and Surface and Interfacial Tension of the System Water +n-Butyl Acetate + 1-Propanol at 323.15 K and Atmospheric Pressure

Liquid–Liquid Equilibria, Density, Refractive Index, and Solubility for Mixtures of Water + Methanol + Heptane + Methylbenzene or + Dimethyl Carbonate at T = 298.15 K

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