Solubility of ethyl-(2-hydroxyethyl)-dimethylammonium bromide in alcohols (C2-C12)

The solubilities of a novel third generation of the precursor of ionic liquids, named ethyl -(2-hydroxyethyl)-dimethylammonium bromide, C2Br, in alcohols {ethanol, 1-butanol, 1-hexanol, 1-octanol, 1-decanol, 1-dodecanol, 2-butanol, 2-methyl-2-propanol (tert-butyl alcohol)} have been measured by a dynamic method from 240 to 440 K. The solubility of ethyl -(2-hydroxyethyl)-dimethylammonium bromide in primary alcohols decreases with an increase of the molecular weight of the alcohol from C-2 to C-12. The differences in solubilities between the primary and secondary alcohols are not significant. The solubility of C2Br in tert-butyl alcohol is much lower than in 1-butanol and 2-butanol. The data were correlated by means of the UNIQUAC ASM, NRTL1 and NRTL2 equations, utilizing parameters derived from the (solid+liquid) equilibrium (SLE) data. The root-mean-square deviations of the solubility temperatures for all calculated data are from 2.36 to 7.17 K and depend on the particular equation used. In the calculations, the existence of a solid-solid first-order phase transition in pure C2Br has also been taken into account. (c) 2005 Elsevier B.V. All rights reserved.