Mutual Solubilities of Alkylbenzene + Water Systems at Temperatures from 303 to 373 K: Ethylbenzene, p-Xylene, 1,3,5-Trimethylbenzene, and Butylbenzene

Mutual solubilities for p-xylene, 1,3,54rimethylbenzene, ethylbenzene, and butylbenzene have been measured near the three-phase curve from 303 to 373 K. Calculated enthalpies of solution of hydrocarbons into water compare well with published calorimetric measurements. The estimated minimum solubility temperatures agree well with those estimated from calorimetric measurements. The results also provide insight into the mechanism of water dissolving into liquid hydrocarbons. The calculated enthalpies of solution of water into hydrocarbons are approximately equal to the molar hydrogen bonding energy of water. The entropy of mixing water into this series of alkylbenzenes can be considered constant in the range 303-373 K.