Phase equilibria in the ternary system hexane plus ethyl 1,1-dimethylethyl ether plus heptane

Consistent vapor-liquid equilibrium data at 94 kPa have been determined for the ternary system hexane + ethyl 1,1-dimethylethyl ether + heptane. The results indicate that the system deviates positively from ideality and that no azeotrope is present. The ternary system were predicted with the composition by the Redlich-Kister, Wilson, NRTL, UNIQUAC and UNIFAC models using only the parameters of the constituent binaries. Most of the models allow a very good prediction of the phase equilibrium of the ternary system. In addition, the Wisniak-Tamir relations were used for correlating bubble-point temperatures. (C) 1999 Elsevier Science B.V. All rights reserved.