A thermodynamic study of solutions of liquid hydrocarbon mixtures in water

Mathematics – Logic

Scientific paper

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Scientific paper

The hydrocarbon solution process in water was studied because it is important in environmental and geological situations. The aqueous solubility of binary hydrocarbon mixtures was determined (n-octane + 1-methylnaphthalene at 20 and 70°C; n-octane + ethylbenzene at 20°Cand tetralin + methylcyclohexane at 20°C). Vapor-liquid equilibrium hydrocarbon phase activity coefficients for the above mixtures were also determined. Hydrocarbon activity coefficients in the aqueous phase were found not to be measurably reduced in the presence of hydrocarbon co-solutes, in contradiction to the conclusions of LEINONEN and MACKAY (1973) and LEINONEN (1976). This indicates that the effects of aqueous phase solute-solute interactions can not be determined within the precision of water solubility measurements.The presence of a substantial amount of water in the liquid hydrocarbon phase at 70°C did not significantly affect the hydrocarbon activity coefficients in the hydrocarbon phase. Activity coefficients estimated by the UNIFAC group-contribution method indicate that water in the hydrocarbon phase may not significantly affect hydrocarbon phase activity coefficients up to 150°C.

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