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Ternary liquid equilibrium data at 30 ± 0.1 °C for the systems water-acetonitrile-toluene, water-acetonitrile-methyl Isobutyl ketone, water-acetonltrlle-lsoamyl acetate, water-acetonitrile-isoamyl alcohol, and water-acetonitrile-methyl ethyl ketone are obtained. The

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Isobaric vapour‐liquid equilibrium data have been determined for the binary systems hexane‐hexylalcohol and heptane‐hexylalcohol at 760 mm of Hg total pressure, using a Scatchard and Ticknor still. The isobaric vapour‐liquid equilibria of both the systems have been correlated satisfactorily by the equations of Redlich & Kister as modified by Chao despite the wide variation in boiling points. Ewell et al.1 have classified liquids into five groupings based on their properties of forming hydrogen bonds. According to this classification, hydrocarbon‐alcohol combinations involve breaking of hydrogen bonds and always show positive deviations. A systematic study of the vapour‐liquid equilibrium data of these has been attempted and the present work presents the results.

Isobarlc vapor-liquid equilibrium data for the systems acetonltrlle-sec-butyl alcohol and acetonltrile-ferf-butyl alcohol are measured and reported at 760 mmHg. Both the systems show positive deviations from Raoult's law and form minimum boiling azeotropes. Margules three suffix equations fit the data well and thermodyamlc consistency Is tested by the Herington method.