Abstract
The distribution of monocarboxylic acids is reported for extraction systems with binary extracting agents, namely, amine and quaternary ammonium base (QAB) salts of organic acids with widely varied acid dissociation constants (pK a 1.5–10). Monocarboxylic acid extractability orders have been obtained for systems with binary extracting agents based on trioctylmethylammonium and trioctylammonium (TOA). The best extractability is shown by acids with long hydrocarbon radicals (butyric and caproic acids). Lactic acid is the least extractable. Extractive power orders have been obtained for QAB- and TOA-based binary extracting agents. For monocarboxylic acid extraction with QAB salts, the extractive power order correlates with the acid dissociation constants of the parent organic acids: trioctylmethylammonium p-tert-butylphenolate ≫ caprylate > dialkylphosphinate > dialkylmonothiophosphinate > dialkylphosphate > dinonylnaphthalene sulfonate > dialkyldithiophosphinate. The extractive power of the QAB-based binary extracting agents is much higher than that of the TOA salts.
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Original Russian Text © Yu.A. Zakhodyaeva, A.A. Voshkin, V.V. Belova, A.I. Khol’kin, 2010, published in Khimicheskaya Tekhnologiya, 2010, Vol. 11, No. 7, pp. 407–412.
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Zakhodyaeva, Y.A., Voshkin, A.A., Belova, V.V. et al. Extraction of monocarboxylic acids with binary extracting agents based on amines and quaternary ammonium bases. Theor Found Chem Eng 45, 739–743 (2011). https://doi.org/10.1134/S0040579511050186
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DOI: https://doi.org/10.1134/S0040579511050186