Experimental and Theoretical Study of the Phase Equilibria in Ternary Aqueous Mixtures of 1,4-Butanediol with Alcohols at 298.2 K

Abstract

Ternary liquid-liquid equilibrium (LLE) data for the mixtures of water + 1,4-butanediol + organic solvent (cyclohexanol, 2-ethyl-1-hexanol, and 1-decanol) were determined at 298.2 K and atmospheric pressure. These three ternary systems exhibit type-1 behavior of LLE. The immiscibility region was found to be larger for the branched aliphatic alcohol, 2-ethyl-1-hexanol. The experimental ternary LLE data were correlated using the UNIQUAC and NRTL models, and the binary interaction parameters were obtained. The reliability of the experimental tie-line data was tested through the Othmer-Tobias and Bachman correlation equations. Distribution coefficients and separation factors were calculated to evaluate the extracting capability of the solvents. The LLE results show that 2-ethyl-1-hexanol may be considered to be a reliable organic solvent for the extraction of 1,4-butanediol from aqueous solutions.

Phase equilibria in ternary aqueous mixtures of 1,3-butanediol with 2-ethyl-1-hexanol at T=(298.2, 303.2 and 308.2)K

“…We have recently reported the LLE data for aqueous mixtures of 1,4-butanediol with alcohols at 298.2 K [9]. The LLE data for the (water + 2,3-butanediol + 2-ethyl-1-hexanol) system have also been reported by one of the authors [10].…”

“…2,3-BD, 1,3-BD and 1,4-BD) by the solvent (2EH), the separation factor values were measured in this work and were compared with those of 2,3-butanediol and 1,4-butanediol [9,10]. Table 4 summarizes the range of variation of this quantity for Table 3 Separation factors (S) and distribution coefficients of 1,3-BD (D2) and water (D1) at different temperatures.…”

Dielectric studies of binary mixtures of ethylene glycol mono phenyl ether with 1-butanol at different temperatures

“…[1][2][3] The static permittivity has proven to be a useful property in characterizing molecular interaction and molecular ordering in solutions, as the value of dielectric permittivity is strongly related both to the chemical structure of a molecule and to intermolecular interactions. [4][5][6][7] By using dielectric data of binary liquid mixtures over a range of mole fractions and temperatures, it is possible to obtain valuable information regarding the nature and strength of interactions in liquid mixtures.…”

(Liquid+liquid) equilibria in ternary aqueous mixtures of phosphoric acid with organic solvents at T=298.2K

“…Precise LLE data of aqueous mixtures with organic solvents are needed in the evaluation of industrial units for solvent extraction processes. The accurate interpretation of phase equilibria and thermodynamic behaviour for the different ternary mixtures is a fundamental and important key to improving solvent extraction techniques [1][2][3][4][5][6][7][8][9].…”