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Separation of phenylacetic acid using tri-n-butyl phosphate in hexanol: Equilibrium and kinetics

ABSTRACT Equilibrium and kinetics studies are required to design the continuous extraction process for the acid-extraction system. In the present study, an attempt has been made to investigate the equilibrium and kinetics parameters for the reactive extraction of phenylacetic acid (PAA) with tri-n-butyl phosphate (TBP) in hexanol. The equilibrium results show that the formation of the (1:1) PAA–TBP complex in the organic phase with an overall equilibrium complexation constant (Ke) was 78.74 and 29.15 m3.kmol−1 for TBP concentrations of 0.734 and 1.464 kmol.m−3, respectively. The mass transfer coefficients (kL) for PAA were found to be in the range of 3.7 × 10–5–6.2 × 10–5 m.s−1. Based on the Hatta number (Ha = 8.48), the reaction was found to be fast chemical reaction (regime 3) with the order of reaction as 0.77 and 0.36 with respect to PAA and TBP, respectively. The rate constant of the reaction was obtained as 0.017 kmol.m−3.s−1.