US EPA

4734358 

Journal Article 

Examination of Extraction of Vanadium(V) by Trioctylamine from Sulfuric Solutions 

Kurbatova, LD; Koryakova, OV; Valova, MA; Yanchenko, MYu 

2015 

1 

Zeitschrift fuer Anorganische und Allgemeine Chemie
ISSN: 0044-2313 

641 

3-4 

617-621 

10.1002/zaac.201400426 

WOS:000351445600019 

The effect of different factors, such as pH of the medium (1.5 < pH < 4.0; 1x10(-4) molL(-1) < [SO42-] < 1x10(-1) molL(-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 degrees C takes place in the pH range 2.0-3.5 and the extracting complex contains decavanadate anion H2V10O284- 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(R3NH)(2)SO4 + H2V10O284- (R3NH)(4)H2V10O28 + 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 C12H25OH as a modifying agent. It was shown that under optimal conditions in the presence of isododecyl alcohol at temperatures above 25 degrees C in the pH interval 2.0-3.5 trioctylamine extracts vanadium(V) with a high distribution coefficient (lg D-V(V) > 2). 

Extraction; Vanadium; Trioctylamine; Vanadates