Fluid Phase Equilibria, Vol.143, No.1-2, 111-123, 1998
Thermodynamic properties of n-alkoxyethanols plus organic solvents mixtures - VIII. Liquid-liquid equilibria of systems containing 2-methoxyethanol and alkanes (C6H12 and CH3-(CH2)(u)-CH3, u=3, 4, 6, 8)
Liquid-liquid equilibria (LLE) data are reported for 2-methoxyethanol + n-pentane, + n-hexane, + n-octane, + n-decane, or + cyclohexane mixtures at atmospheric pressure, between 281 K and the upper critical solutions temperatures (UCST). The coexistence curves were determined visually. These curves are rather symmetrical, with the asymmetry increasing with the size of the n-alkane. The UCSTs increase almost linearly with the number of the carbon atoms of the n-alkane. The system with cyclohexane shows the lower UCST. The (x,T) data were fitted to the equation T = T-c + k\y-y(c)\(m) where y = gamma x(1)/{1 + x(1)(gamma - 1)} and y(c) = gamma x(1c)/{1 + x(1c)(gamma - 1)}. T-c and x(1c) are the coordinates of the critical points fitted together with k, m and gamma using a Marquardt algorithm. The critical exponents of the order parameter for the mixtures studied are calculated. Its mean value is 0.363.
Keywords:LONG-CHAIN 1-ALKANOLS;EXCESS MOLAR VOLUMES;INTERCHANGE ENERGY PARAMETERS;DI-NORMAL-BUTYLETHER;CYCLOHEXANE MIXTURES;PHASE-EQUILIBRIA;BINARY-MIXTURES;CRITICAL-POINTS;NORMAL-HEPTANE;MODEL DISQUAC