A Ghanadzadeh Gilani - Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran
H Ghanadzadeh Gilani - Department of Chemical Engineering, University of Guilan, Rasht, Iran
M Ansari - Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran

Dielectric studies on binary mixtures are important for understanding the intermolecular interactions (dipole-dipole interaction and hydrogen bonding) in the mixture. The heterogeneous and homogeneous interactions in binary mixtures using dielectric measurements have been studied and reported by several investigators [۱–۳].۱,۲-butanediol (۱,۲BD) is one of four stable isomers of BD, which has many scientific and industrial applications. The presence of two hydroxyl groups in vicinal positions (at the positions ۱ and ۲) of this diol makes it suitable as a useful chemical intermediate in the manufacture of many chemical products. The separation of BDs from aqueous solutions using solvent extraction technique is industrially and scientifically important. It is recently reported that, ۲-ethyl-۱-hexanol (۲EH) can be used as a good solvent for the extraction of BDs from aqueous solutions [۴].

Relative permittivity; Dipole moment; ۱,۲-Butanediol; Kirkwood factor; Excess free energy