Abstract
The present study deals with the equilibrium reactive extraction of glycolic acid from aqueous solution by two different extractants [tri-n-butyl phosphate (TBP) and tri-n-octylamine (TOA)] at constant concentration of 0.573 kmol·m−3 dissolving in a wide range of diluents [n-hexane, decane-1-ol, n-hexane + decane-1-ol (1:1 v/v), 4-methylpentan-2-one (MIBK), benzene, and dichloromethane (DCM)] at isothermal conditions (298 ± 1 K). The effects of various parameters such as acid concentration (0.10−0.57 kmol·m−3), extractant type, and type of diluent on the recovery of glycolic acid from aqueous solution are derived. The values of equilibrium constants (KE), number of reacting acid molecules (m) per extractant molecule, and also the equilibrium constants (K11 and K21) for individual complexes between acid and extractant are estimated through the proposed mathematical model. Further, the experimental values of the distribution coefficients (KD) are correlated using the linear solvation energy relationship (LS...
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