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.

Isobaric vapour‐liquid equilibrium results have been determined for the binary system acetone‐hexyl alcohol at 760 mm total pressure by use of a Scatchard still. The vapour‐liquid equilibrium results for this system are satisfactorily correlated by Wohl's three‐suffix Margules equations.