Abstract
The paper represents the equilibrium study on reactive extraction of pyridine-3-carboxylic acid (NA) and pyridine-4-carboxylic (iNA) acid from aqueous solution by N, N-dioctyloctan-1-amine (TOA) dissolved in five different diluents [dodecane, methyl benzene, decan-1-ol, 4-methylpentan-2-one (MIBK), and chloroform] at constant temperature of 298 ± 1 K. According to an experimental study, the extraction ability of diluents with TOA is found to be in the order of chloroform > decan-1-ol > MIBK > methyl benzene > dodecane for both acids. The highest extraction efficiency in terms of the distribution coefficient (K D) is found to be 45.15 and 25.79 for NA (0.12 mol · dm−3) and iNA (0.03 mol · dm−3), respectively. The values of loading ratio, Z (between 0.194 and 0.512) for both acids indicate the formation of 1:1 acid-TOA complexes in the organic phase. The values of the equilibrium constants (K 11) are determined from the experimental data using mass action law. These estimated values of K 11 are compared with the predicted values of K 11 from relative basicity and linear solvation energy relationship (LSER) models. The LSER model predicts the K 11 with an error limit of ±3% for NA and ±2% for iNA.
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