Thermodynamic Properties of n-Alkoxyethanols + Organic Solvent Mixtures. IX. Liquid−Liquid Equilibria of Systems Containing 2-Methoxyethanol or 2-Ethoxyethanol and Selected n-Alkanes

Liquid−liquid equilibria (LLE) data are reported for 2-methoxyethanol + dodecane, and for 2-ethoxyethanol + dodecane, + tetradecane, or + hexadecane mixtures between 275.7 K and the upper critical solution temperatures (UCST). The solubility curve of pure solid hexadecane in liquid 2-ethoxyethanol is also presented in the range of 0 to 0.1833 of mole fraction in 2-ethoxyethanol. The coexistence curves were determined visually. For a given alkoxyethanol, the LLE curves are rather asymmetrical, with the asymmetry increasing with the size of the n -alkane. Moreover, the UCSTs increase almost linearly with the number of the carbon atoms of the n -alkane. The ( x, T ) data were fitted to the equation T = T c + k | y − y c | m, where y = α x /{1 + x (α − 1)} and y c = α x c /{1 + x c (α − 1)}. T c and x c are the coordinates of the critical points fitted together with k, m, and α using a Marquardt algorithm.