Relation between the structure and extracting power of higher tertiary amines |
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Authors: | V. P. Shvedov A. A. Kopyrin V. S. Titov |
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Affiliation: | 1. Leningrad Lensoviet Institute of Technology, Leningrad, (USSR)
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Abstract: | The effect of the composition and structure of higher tertiary amines on their efficiency in extracting nitric acid has been examined. The ionization constants of the amines in methanol have been determined by potentiometric titration. The extraction constants for nitric acid have been determined at constant ionic strength in the aqueous phase (μ=1). The dependence of these constants upon the concentrations and the degree of association of the amine salts in the organic phase has been examined. For the cases in which the role of steric factors is negligible it has been shown that at low amine salt concentrations in the organic phase there are quantitative regularities between the ionization constants of the amines in methanol, their extraction constants for nitric acid and the inductive effects of the substituents on the nitrogen atom. |
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