Thermodynamic properties of n-alkoxyethanols plus organic solvent mixtures.: XIV.: Liquid-liquid equilibria of systems containing 2-(2-ethoxyethoxy)ethanol and selected alkanes

Liquid-liquid equilibria (LLEs) data are reported for 2-(2-ethoxyethoxy)ethanol + hexane, heptane, octane, decane, dodecane, and hexadecane mixtures between 274.5 K and the upper critical solution temperatures (UCSTs). The coexistence curves were determined visually. They have a rather horizontal top, and their symmetry depends on the size of the alkane. For systems with dodecane or hexadecane, they are skewed to the region of higher mole fractions of 2-(2-ethoxyethoxy)ethanol. An opposite behavior is observed when hexane or heptane is involved. The (x(1), T) data were fitted to the equation T = T-c+ k/y - y(c)/(m), where y = alphax(1)/[1 + x(1)(alpha - 1)] and y(c) = alphax(1c)[1 + x(1c)(alpha - 1)]. T-c and x(1C) are the coordinates of the critical points fitted together with k, m, and alpha. Results are briefly discussed on the basis of the existence of inter- and intramolecular H-bonds as well as of dipole interactions, which occur in solutions containing hydroxyethers.