Thermodynamics of solution of aromatic hydrocarbons in water and in water-ethanol solutions: Comparison of some methodologies

Journal Article · Thu Jul 27 00:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100352a056· OSTI ID:7246492

Smith, R R; Charon, N W; Canady, W J ^[1]

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1. West Virginia Univ. Medical Center, Morgantown (USA)

The method of Franks et al. has been applied to studies of the solubilities of both liquid and solid hydrocarbons. The temperature dependence of the solubility of toluene in water has been determined and shown to agree well with previous studies. In addition, the solubilities of n-alkyl-substituted benzenes (toluene through butylbenzene) in water have been determined at 25{degree}C; when the free energies of solution are plotted vs number of methylene groups added, a linear result was observed with a slope of about 0.71 kcal/mol per methylene group, with very little scatter being observed. The effects of added ethanol upon the free energy of solution of naphthalene at 25{degree}C have been examined by using the above-mentioned methodology of Franks et al. The results are shown to agree well with those obtained by a different methodology. The method of Franks et al is thus shown to be practical for the study of solid hydrocarbons. The long times required for equilibration of the hydrocarbon-water solutions have been shown to present no problems from contamination by microorganisms: the aromatic hydrocarbon actually exerts an inhibitory effect in this regard. The possibility of error due to adsorption of hydrocarbons from the aqueous phase to the windows of the cuvettes has been considered. Means of taking this into account (if it occurs) are outlined. This effect has been shown to be negligible or nonexistent in the case of aqueous naphthalene solutions. The methodology could find application in the study of adsorption of various substances to plastic and glass surfaces.

• OSTI ID: 7246492
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 93:15; ISSN 0022-3654
• Country of Publication: United States
• Language: English

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