Isothermal vapor−liquid equilibria (VLE) were obtained for ethyl tert-butyl ether + n-alcohol (C1−C4) at
333.15 K by headspace gas chromatography, and excess molar volumes were determined from density
measurements using a vibrating tube densimeter at 298.15 K. The binary mixtures showed positive
deviation from the Raoult's law, and those containing methanol and ethanol have minimum boiling
azeotropes. The excess molar volumes of all the binary mixtures were negative. The measured VLE
data are well described using a modified UNIFAC equation (Dortmund), and excess molar volumes are
correlated with the Redlich−Kister polynomial.
Ether mixtures containing oxygen in their body such as 2-methoxy-2-methylbutane (tert-amyl methyl ether; TAME) and 2-methoxy-2-methylpropane (methyl tert-butyl ether; MTBE) are used as octane boosters for lead-free or low-leaded gasoline because of their octane-enhancing and pollution-reducing capabilities. In this work, isothermal vapor-liquid equilibrium was measured by headspace gas chromatography, one of the static methods, for TAME + n-alcohol (C 1 -C 4 ) binary mixtures at 323.15 and 333.15 K. The binaries showed positive deviations from Raoult's law and have minimum boiling azeotropes, except for TAME + 1-butanol. Results were correlated with G E model equations and also compared with the values predicted by modified UNIFAC (Dortmund).
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