The Gillespie-type still used by Lu was modified to provide a better approach to equilibbrium. It was tested by comparing experimental and literature data for binary mixtures of ethanol-benzene and methanol-water. Isothermal vapor-liquid equilibrium data were then determined for acetone-n-heplane mixtures at 65°C. Redlich-Kister constants were evaluated by a weighted least-squares fit and are presented.
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