The multicomponent solubility of hydrocarbons in water

The aqueous solubility of six binary hydrocarbon systems consisting of benzene and cyclohexane with each of 2-methyl-pentane, n-hexane, and l-hexene, have been measured at 25d'C. The solubility of each hydrocarbon component is greater by from 6 to 35% than the value expected by prediction on the basis of the solubility of the hydrocarbon component being proportional to its mole fraction in the hydrocarbon phase. This positive deviation is partly attributable to the activity coefficient of the hydrocarbon in the hydrocarbon phase being slightly greater than unity. There is, however, additional solubility enhancement of from 1 to 25% with an average of 10.7% apparently due to the reduction of the hydrocarbon activity coefficients in the aqueous phase by the presence of the other hydrocarbon. The implications of these effects in calculating the solubility of complex hydrocarbon mixtures in water is considered. On a mesure a 25°C la solubilite aqueuse de six systemes binaires d'hydrocarbures formes de melanges du benzene et du cyclohexane avec le 2-methylpentane, l'hexane normal et l'hexene normal pris separement. La solubilite de chaque composant (hydrocarbure) est plus elevee de 6 a 35% que la valeur prevue en se basant sur le fait que la solubilite du composant est proportionnelle a sa fraction moleculaire dans la phase hydrocarbure. Cet ecart positif est partiellement attribuable an fait que le coefficient d'activite de l'hydrocarbure dans la phase hydrocarbure excede a peine l'unite. Il y a, cependant, un accroissement de solubilite de 1 a 25% (10.7% en moyenne) a cause apparemment de la diminution des coefficients d'activite des hydrocarbures dans la phase aqueuse due a la presence de l'autre hydrocarbure. On considere les implications des dits effets dans le calcul de la solubilite dans l'eau de melanges complexes d'hydrocarbures.