Water-ethanol mixtures preferential solvation

Other studies of the preferential solvation for which information can be derived from KBIs in ternary systems have also been made. The system -heptane -i- ethanol + 1-propanol at 313 K (Zielkiewicz 1995a) showed that ethanol and 1-propanol mix in a random manner in the presence of -heptane with no preferential solvation between these two solvents. The same author studied the solvation of N,N-dimethylformamide (C) in mixtures of water (A) and each of methanol, ethanol, and 1-propanol (B) at 313 K (Zielkiewicz 1995b). At Xc > 0.8 this component was solvated equally by A and B, but at Xc < 0.15 it was preferentially hydrated, that is, solvated by A, except when x > 0.8, where the solvation of C by A and B was random. A,A-dimethylformamide (C) featured also in the studies (Ruckenstein and Shulgin 2001a) of it in aqueous (A) methanol (B). The KBIs in the system n-hexane + 1-hexanol + methyl benzoate were studied at 298 K (Aparicio et al. 2005). They calculated the excess (or deficit) number of molecules of, say. A, around molecules of B in pseudobinary systems at constant mole fraction of C from... 

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