(1) have recently reported a successful prediction of vapor-liquid equilibria in binaries of acetates and alcohols using a theory of liquid mixtures developed by Barker ( 2 , 3 ) . In this treatment the liquid is assumed to have a quasicrystalline structure in which there is short-range order and long-range disorder. The molecules are assumed to occupy well-defined sites on a regular lattice and the interactions of the molecules with their neighbors are considered. The interaction energies are assumed to depend upon the nature of the molecular surfaces which are adjacent to each other and if suitable values are assigned to these energy terms, it is possible to calculate the excess chemical potential of the mixture and the activity coefficients. Sweeney and Rose showed that for the homologous set of binary mixtures of normal alcohols and their acetates ( CnH2n t 10H and CnHsn + 1COOCH3) a single set of interaction energies, obtained by fitting to data for one member of the set, can be used to predict vapor-liquid equilibria for the others.In this way Sweeney and Rose showed that the same interaction energies satisfactorily correlated C1, Cz, Cq, and Cs data. The purpose of this note is to show that two of the missing members of the series can also be successfully correlated with the same interaction energies. PROPANOL-PROPYL ACETATEMeasurements of vapor-liquid equilibrium in n-propnnol-n-propyl acetate were reported independently in 1959 by Smirnova ( 4 ) and Pick et al. ( 5 ) . The two sets of data a,re in close agreement over the full concentration range. With the same values for interaction energies as were used by Sweeney and Rose, the vapor-liquid equilibrium data for this system at 760 mm. Hg were calculated.
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