Extraction equilibria of propionic acid from aqueous solutions by Amberlite LA-2 in diluent solvents

Asci Y. S. , Inci I.

CHEMICAL ENGINEERING JOURNAL, vol.155, no.3, pp.784-788, 2009 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 155 Issue: 3
  • Publication Date: 2009
  • Doi Number: 10.1016/j.cej.2009.09.024
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.784-788
  • Istanbul University Affiliated: Yes


Amberlite LA-2 (a secondary amine) was studied for its ability to extract propionic acid at different amine concentrations. The extraction of propionic acid by Amberlite LA-2 dissolved in seven single solvents (cyclohexane, 2-octanone, toluene, methyl isobutyl ketone, isooctane, haxane and 1-octanol) was investigated under various amine concentrations at 298.15 K. Using Bizek's approach, two acids: amine complexes, (HO):(R2N) and (HO):(R2N)(2), are assumed to exist in the organic phase in case of proton-donating diluents, while the complexes (HO):(R2N) and (HO)(2):(R2N)(3) are suggested in the case of non-proton-donating diluents. Important data for design of separation units have been obtained as a result of batch experiments. These data are distribution coefficients (D), loading factors (Z), extraction efficiency (E) and overall extraction constants (K-11, K-12, K-23). The maximum removal of glycolic acid is 94.68% with MIBK and 0.93 mol L-1 initial concentration of Amberlite LA-2. (C) 2009 Elsevier B.V. All rights reserved.