Abstract
The solubilities of C 18, C 20 and C 22 alkanoic acids (octadecanoic, eicosanoic, docosanoic) in 15 one- and two-component solvents have been measured by a dynamic method in the temperature range 290–353 K. The solvent mixtures exhibited negative deviations from ideality and consisted of cyclic ethers (1,4-dioxane, tetrahydrofuran) and of chloroform, as well as toluene + butyl acetate. 1,4-Dioxane + chloroform and tetrahydrofuran + chloroform mixed solvent systems were found to exhibit a negative synergetic effect on solubility. The results of these measurements have been compared with those obtained from the correlation and prediction by means of three equations: that of Wilson in two versions, UNIQUAC and NRTL. The best results of correlation and prediction have been obtained with the Wilson equation utilizing simple temperature-dependent parameters, i.e. ( g ij - g ii ) = a ij T -1. The root-mean-square deviations of the solubility temperatures for all measured data vary from 0.4 to 1.1 K.
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