Vapor−liquid equilibrium (VLE) and excess enthalpy (H
E) data of binary and ternary mixtures
involving 1,1-dimethylethyl methyl ether (tert-butyl methyl ether or MTBE) or 1,1-dimethylpropyl
methyl ether (tert-amyl methyl ether or TAME) and alkanes, olefins, benzene, and alcohols have
been studied using the UNIQUAC model, the original UNIFAC group contribution model, and
the modified UNIFAC models of Lyngby and Dortmund. Values for the binary parameters
required in the UNIQUAC model are obtained from binary VLE or H
E data. Binary VLE data
are predicted using the UNIQUAC equation with parameters obtained from H
E data and the
UNIFAC and modified UNIFAC models. Ternary VLE data are predicted using the UNIQUAC
equation with parameters obtained from binary H
E or VLE data and the UNIFAC and modified
UNIFAC models. Accurate ternary data are obtained using the UNIQUAC equation with
parameters determined from binary VLE data. The modified UNIFAC (Dortmund) model is
shown to provide good predictions of binary and ternary VLE data and can be recommended for
those cases in which the related binary VLE data are not available.
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