THE EXTRACTION BY N, N-DIALKYLAMIDES.I. HNO3AND OTHER INORGANIC ACIDS.
- 1 January 1988
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 6 (6) , 1007-1034
- https://doi.org/10.1080/07366298808917975
Abstract
The extraction of HNO, by N,N-dialkylbutanamides is investigated by distribution measurements and IR spectroscopy. A mechanism involving the competing formation of three adducts is proposed : (HNO3,)(Amide)2 (HNO3,)(Amide) and (HNO3,)2,(Amide), for which the equilibrium constants for 1M amide are respectively : 0.054, 0.086, 1.35.10-5 for DOi.BA and 0.043, 0.135, 5.7.10-5 for DOBA. The IR spectra show, in every species, hydrogen bonds linking amide and acid. From these results and previous works on inorganic acids extraction by other ligands such as diamides and TBP, we suggest an interpretation of the acids extraction, according to the relative basicities of water, acid anion and neutral organic extractant.Keywords
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