TEMPERATURE DEPENDENCIES OF SPREADING COEFFICIENTS OF HYDROCARBONS ON WATER

This paper describes experimental work on the equilibrium spreading coefficient of one liquid on another, S, at elevated temperatures and pressures, and also an attempt to provide a universal correlation for S as a function of temperature T. The new data together with those obtained in the preceding work (Takii and Mori, J. Colloid Interface Sci. 161, 31 (1993)) cover n-octane/water at 0-150 degrees C and n-heptane/water at 0-70 degrees C. It is demonstrated that these data are correlated, with reasonable accuracy, by a single formula having the form S(T)/S-i = f[(T - T-i)I(T-c - T-i)], where T-i and T-c denote the ice point of water and the critical-point temperature of each hydrocarbon, respectively, and S-i denotes S at the ice point. (C) 1995 Academic Press, Inc.