Abstract
Extraction of citric acid from aqueous solutions with TAA, a mixture of tertiary aliphatic amines, dissolved in 1-octanol/n-heptane mixtures, and coextraction of water have been studied as a function of acid, amine, and octanol concentrations at different temperatures. Using a chemical modeling approach, two complexes [acid-amine-h 11 H 2 O and acid-(amine) 2 .h 12 H 2 O] have been assumed to exist in the organic phase, and the corresponding equilibrium constants, apparent enthalpies, and entropies of complex formation have been evaluated
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