Solubility of Benzil in Binary Alkane + Cyclooctane Solvent Mixtures: Comparison of Predictive Expressions Derived from the Nearly Ideal Binary Solvent (NIBS) Model

Abstract Experimental solubilities are reported for benzil dissolved in seven binary mixtures containing cyclooctane with n-hexane, n-heptane, n-octane, n-nonane, methylcyclohexane, 2,2,4-trimethylpentane, and tert-butyl-cyclohexane at 25°C. Results of measurements are compared to the predictions of equations developed previously for solubility in systems of nonspecific interactions. The most successful equation in terms of goodness of fit involved a volume fraction average of the excess Gibbs free energies relative to the Flory-Huggins model, and predicted the experimental solubilities in the seven systems studied to within an overall average absolute deviation of 2.1% and with a maximum deviation of 3.6%. Key Words: Benzil solubilitiesbinary solvent mixturessolubility predictions