Thermodynamic properties of N-alkoxyethanols plus organic solvent mixtures. X. Liquid-liquid equilibria of systems containing 2-methoxyethanol, 2-(2-methoxyethoxy) or 2-(2-ethoxyethoxy)ethanol, and selected alkanes

Liquid-liquid equilibria (LLE) data are reported for 2-methoxyethanol + hep tane, + methylcyclohexane, or + 2,2,4-trimethylpentane and for 2-(2-methoxy ethoxy)ethanol + 2,2,4-trimethylpentane and 2-(2-ethoxyethoxy)ethanol + met hylcyclohexane mixtures between 281.8 K and the upper critical solution tem peratures (UCSTs). The coexistence curves were determined visually. They ha ve a rather horizontal top and are skewed to the region of higher mole frac tions of the alkoxyethanol, x(1), for systems with 2-methoxyethanol, and to the region of lower x(1) values for the mixtures including the other two h ydroxyethers. The (x(1), T) data were fitted to the equation T = T-c + k/y - y(c)/(m), where y = alpha x(1)/{1 + x(1)(alpha - 1)} and y(c) = ax(1c)/{1 + x(1c)(alpha - 1)}. T-c and x(1c) are the coordinates of the critical poi nts 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.