Abstract
Distribution of citric acid between water and trialkylamine C 7-C 9 dissolved in 7 various diluents ( p-xylene, toluene, benzene, MIBK, 1-octanol, methylene chloride, chloroform) was studied. Using a “chemical modeling” approach two acid: amine complexes, ACID. AMINE and ACID. (AMINE) 2, have been assumed to exist in the organic phase in the case of proton-donating diluents (octanol, chloroform, methylene chloride), while the complexes ACID. AMINE and (ACID) 2(AMINE) 3 have been suggested in the case of aromatics and MIBK. The estimated values of overall extraction constants, K 11, K 12 and K 23, were correlated with solvatochromic parameters of the diluents according to the linear solvation energy relationship (LSER). Using this correlation the extractability of citric acid can be predicted for a wide range of diluents or their mixtures. The coextraction of water with acid was explained in terms of the corrected physical solubility of water, m w *, and hydration coefficients, h 11, h 12 and h 23. The values of hydration coefficients were also correlated with the solvatochromic parameters of the diluents.
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