Intensification of picolinic acid extraction with tri-n-butylphosphate and tri-n-octylamine in three different diluents

• Equilibrium study on reactive extraction of picolinic acid is performed.
• Tri-n-butylphosphate (TBP) and tri-n-octyl amine (TOA) are used as extractants.
• A better synergism is observed (80% extraction efficiency) with TBP:TOA = 1:1.
• Mathematical modeling is performed to get insight of reaction mechanisms.
• Equilibrium modeling is done to describe synergistic effect.

In this paper, the equilibrium study on reactive extraction of picolinic acid from aqueous solution is studied by individual and mixed extractant of tri-n-butyl phosphate (TBP) and tri-n-octylamine (TOA) in three different diluents at a constant temperature, 298 K. A better synergism is observed (80% extraction efficiency) with a TBP:TOA ratio of 1:1 for all acid concentration with IAA. Mathematical modeling is also carried out to find insight of mechanism exist between acid and extractant molecules. The results of present study will be useful to intensify the recovery of picolinic acid from fermentation broth (bio-separation) and other aqueous solutions.

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