Liquid-Liquid Equilibria of Gluconic Acid between Water and Tri-n-Octylamine in various Diluent

Abstract

Gluconic acid, C₆H₁₂O₇, is used for a large number of different industrial applications due to some exceptionally useful properties. However, data about gluconic acid and tri-n-octylamine/diluent system are not available in literature. The aim of this study is to investigate the extraction of
gluconic acid from. aqueous solutions by tri-n-octylamine dissolved in a
variety of diluents a in wide range of amine concentrations (0.23–1.72
mol/L). Extractin .equilibria of gluconic acid in the system solution of
tri-n-octylamine in mixtures with 5 various solvents at temperature 298.15
K have been measured. Diluting solvents used in this study are hexane,
cyclohexane, toluene, methyl isobutyl ketone (MIBK) and propanol. Using
Bizek approach three acid : amine complexes, (Acid)·(Amine);
(Acid)·(Amine)₂ and (Acid)₂ (Amine)₃ have been assumed to exist in org
ganic phase. As a result of batch extraction experiments distribution coefficients,
loading factors and overall extraction constants were calculated.