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Examination of Extraction of Vanadium(V) by Trioctylamine from Sulfuric Solutions
Author(s) -
Kurbatova Ludmilla D.,
Koryakova Olga V.,
Valova Marina A.,
Yanchenko Mikhail Yu.
Publication year - 2015
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201400426
Subject(s) - vanadium , chemistry , alcohol , toluene , solvent , solubility , extraction (chemistry) , alkyl , sulfuric acid , inorganic chemistry , nuclear chemistry , medicinal chemistry , chromatography , organic chemistry
Abstract The effect of different factors, such as pH of the medium (1.5 < pH < 4.0; 1 × 10 –4 mol · L –1 < [SO 4 2– ] < 1 × 10 –1 mol · L –1 ), the concentration of extracting agent, temperature and the type of the solvent, on the extraction of vanadium(V) by trioctylamine was studied. It was shown that the extraction of vanadium(V) by trioctylamine at 25 ± 0.5 °C takes place in the pH range 2.0–3.5 and the extracting complex contains decavanadate anion H 2 V 10 O 28 4– and four molecules of the extracting agent. This allows the reaction of vanadium(V) extraction by trioctylamine to be described by the following equation: 2( R 3 NH) 2 SO 4 + H 2 V 10 O 28 4– → ( R 3 NH) 4 H 2 V 10 O 28 + 2SO 4 . The effect of the length of the alkyl chain of alcohol (propyl, butyl, isododecyl alcohol) on the homogeneity of the system V V ‐TOA‐toluene‐alcohol was investigated. It was established that the solubility of the extracting complexes of vanadium(V) with trioctylamine can be increased by using isododecyl alcohol C 12 H 25 OH as a modifying agent. It was shown that under optimal conditions in the presence of isododecyl alcohol at temperatures above 25 °C in the pH interval 2.0–3.5 trioctylamine extracts vanadium(V) with a high distribution coefficient (lg D V V > 2).