MIXED-SOLVENTS IN GAS-LIQUID-CHROMATOGRAPHY - ACTIVITY-COEFFICIENTS FOR BENZENE, CYCLOHEXANE, PENTANE AND HEPTANE IN SQUALANE-DINONYLPHTHALATE MIXTURES AT 303-DEGREES-K

Activity coefficients at infinite dilution for benzene, cyclohexane, pentane and heptane in mixtures of squalane and dinonyl phthalate at 303 °K have been determined by the extrapolation of measurements made using a vacuum microbalance technique. Partition coefficients for the solutes at infinite dilution in the solvent mixtures have been derived and found to differ by as much as 6% from those calculated from the partition coefficients for the pure single solvents using the Purnell-Andrade equation, whereas those calculated on the basis of the Flory-Huggins solution theory differ from the experimentally derived values by no more than 1 %. © 1979.