Liquid-liquid equilibria of fuel oxygenate + water + hydrocarbon mixtures. 3: Effect of temperature

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Journal of Chemical and Engineering Data

DOI:https://doi.org/10.1021/je00021a019· OSTI ID:116479

Wagner, G ^[1]; Sandler, S I ^[2]

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1. Universitaet Karlsruhe (Germany). Institut fuer Thermische Verfahrenstechnik
2. Univ. of Delaware, Newark, DE (United States). Center for Molecular and Engineering Thermodynamics

The authors have measured the ternary liquid-liquid equilibria of water + ethanol mixtures with, separately, 2,2,4-trimethylpentane and toluene at 5 and 40 C, water + tert-amyl alcohol (TAOH) mixtures with, separately, toluene and hexane at 5 and 40 C, and of water + TAOH + pentane mixtures at 5 C. The ethanol-containing systems exhibit type 1 liquid-liquid phase behavior, and the TAOH-containing systems exhibit type 2 behavior. These data, together with the data they have previously reported at 25 C, provide information on how the liquid-liquid equilibria of these systems change as a function of temperature. While the addition of ethanol is found to increase the solubility of hydrocarbons in the aqueous phase, the concentration of the hydrocarbon in the water-rich phase decreases with increasing temperature. With the exception of hydrocarbon in the water-rich phase, the experimental data could be correlated quite well with either the UNIQUAC or NRTL models. For most of the systems considered here the predictions of the phase behavior with the liquid-liquid UNIFAC group-contribution model are only qualitatively correct. However, the liquid-liquid UNIFAC model erroneously predicts type 2 phase behavior to occur for water + ethanol + 2,2,4-trimethylpentane system at 5 C.

• Sponsoring Organization: USDOE
• OSTI ID: 116479
• Journal Information: Journal of Chemical and Engineering Data, Journal Name: Journal of Chemical and Engineering Data Journal Issue: 5 Vol. 40; ISSN 0021-9568; ISSN JCEAAX
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
10 SYNTHETIC FUELS
ALCOHOLS
ALKANES
AQUEOUS SOLUTIONS
CLEAN AIR ACTS
EQUATIONS OF STATE
EQUILIBRIUM
ETHANOL
EXPERIMENTAL DATA
FUEL ADDITIVES
HEXANE
MATHEMATICAL MODELS
PENTANE
PHASE STUDIES
THERMODYNAMIC PROPERTIES
TOLUENE