Fluid Phase Equilibria, Vol.361, 45-53, 2014
Solubility and tie line data for the aqueous solutions of butyric acid with 1-octanol and 2-ethyl-1-hexanol at various temperatures
This study demonstrates the experimental and correlated tie line data for the aqueous solutions of butyric acid with two octanol isomers (C18H18O) at T = (298.2, 308.2, and 318.2)K and p = 101.3 +/- 0.4 kPa, for the first time. The chosen isomers were w1-octanol and 2-ethyl-l-hexanol. The obvious difference between these two isomers is that the first isomer is a straight and later is a branched primary alcohol. Experimental solubility data were obtained using the cloud point method. The tie line data were determined by acidimetric titration, the Karl-Fischer technique, and refractive index measurements. Both the ternary systems exhibit type-1 behavior of LLE. The tie-line data were correlated using the UNIQUAC and NRTL models. For each system, the Othmer-Tobias and Hand correlations equations were used to establish the quality of the tie-line data. Distribution coefficients and separation factors were calculated over the biphasic area. (C) 2013 Elsevier B.V. All rights reserved.