Vapor−liquid equilibrium data for the binary systems 2-methylpentane + methyl 1,1-dimethylethyl ether
(MTBE), + ethyl 1,1-dimethylethyl ether (ETBE), and + methyl 1,1-dimethylpropyl ether (TAME) are
reported at 101.3 kPa, including pure component vapor pressures. The measured systems, which deviate
slightly from ideal behavior, can be described as symmetric regular solutions, and only the system
2-methylpentane + MTBE presents an azeotrope. Boiling points are correlated with the Wisniak−Tamir
equation.
Vapor−liquid equilibrium has been measured for the binary system of
methanol (1) + diethylamine (2)
at 101.3 and 300 kPa. Both equilibrium isobars show strong
deviations from ideal behavior and a single
maximum boiling point azeotrope of practically constant composition
x
1 ≈ 0.76, corresponding to a
temperature of 339.8 K at 101.3 kPa and 370.0 K at 300 kPa. The
trend of the high-pressure isobar data
is consistent with the formation of a second minimum boiling azeotrope,
confirming the multiple azeotropic
behavior found by others at a higher temperature (398.58 K).
Furthermore, the excess Gibbs energy is
negative and inflects markedly with composition with increased
pressure. The equilibrium behavior and
polyazeotropy are discussed in terms of self-association and
cross-association of hydroxyl and amino groups.
The data were satisfactorily correlated using the Margules
equation, the UNIQUAC model modified for
association, and the Wisniak−Tamir equation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.