Thermodynamic properties of n-alkoxyethanols plus organic solvent mixtures. XIV. Liquid-liquid equilibria of systems containing 2-(2-ethoxyethoxy)ethanol and selected alkanes
R. Martinez et al., Thermodynamic properties of n-alkoxyethanols plus organic solvent mixtures. XIV. Liquid-liquid equilibria of systems containing 2-(2-ethoxyethoxy)ethanol and selected alkanes, J CHEM EN D, 45(6), 2000, pp. 1036-1039
Liquid-liquid equilibria (LLEs) data are reported for 2-(2-ethoxyethoxy)eth
anol + hexane, heptane, octane, decane, dodecane, and hexadecane mixtures b
etween 274.5 K and the upper critical solution temperatures (UCSTs). The co
existence curves were determined visually. They have a rather horizontal to
p, and their symmetry depends on the size of the alkane. For systems with d
odecane or hexadecane, they are skewed to the region of higher mole fractio
ns of 2-(2-ethoxyethoxy)ethanol. An opposite behavior is observed when hexa
ne 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 th
e critical points fitted together with k, m, and alpha. Results are briefly
discussed on the basis of the existence of inter- and intramolecular H-bon
ds as well as of dipole interactions, which occur in solutions containing h
ydroxyethers.