Generator Column Determination of Water Solubilities for Saturated C₆to C₈Hydrocarbons

Water solubilities, Sw, of C6 to C8 saturated hydrocarbons have been determined at 25°C by using a generator column method. The method is based on pumping water through a bed of a high-surface-area packing, coated with the studied compound. As a result of this process a saturated aqueous solution of that compound is generated, which can be analyzed by gas chromatography. Solubility data are reported for: n-hexane, n-heptane, 3-methylhexane, 2,4-dimethylpentane, n-octane, 4-meth-ylheptane, 2,3,4-trimethylpentane and trans-1,3-dimethylcyclohexane. Experimental Sw values determined in this work are in good agreement with reported data determined from diffusion experiments where no stirring steps are involved, and are lower than those determined from batch-stirring methods, which suggest that solutions produced by generator columns are free from emulsions. No experimental Sw data have been reported previously for 4-methylheptane and trans-1,3-dimethylcyclohexane. The uncertainty in the Sw values determined in this work ranged from ± 1.0 to ± 3.7%.