Extraction of carboxylic acids by ABC extractants: Effects of temperature, the polarity of the diluent, and the ratio between extractant components

N. Syzova, A. M. Eyal*, A. Vitner, B. Hazan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A study was conducted of the temperature effect on the extraction of lactic and malic acid by acid-base couple (ABC) extractants in kerosene. Elevating the temperature from 30°C to 80°C decreases the extraction of both acids by ABC extractants comprising tricaprylyl amine (A336). The opposite effect is found for the extraction of lactic acid by primary amine-containing ABC extractants. It seems that temperature effect in the extraction of lactic and malic acids by ABC extractants results, at least partially, from competition for H-bonding. The study has also tested the effect of diluent polarity in ABC extractants by replacing kerosene there with octanol. It has shown that increased polarity affects the extraction of carboxylic acids mainly through stabilization of ion pairs and formation of H-bonds. Another studied effect was that of the ratio between the amine and the lipophilic acid in the ABC extractants. The results were found to depend on the acid-base properties, polarity, and structure of these components and on the properties of the extracted acid.

Original languageEnglish
Pages (from-to)69-88
Number of pages20
JournalSolvent Extraction and Ion Exchange
Volume22
Issue number1
DOIs
StatePublished - Jan 2004

Keywords

  • ABC extractants
  • Carboxylic acids
  • Diluent-polarity effect
  • Extraction
  • Temperature effect

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