Extraction of V(V) and Fe(III) from aqueous medium containing various concentrations of mineral acids and salts into 1-phenyl- 3-methyl-4-butyrylpyrazolone in mixed organic phase

Abstract

The extraction behaviour of V(V) and Fe(lII) from aqueous medium containing various concentrations of acid and salt into chloroform-butanol and methyl isobutyl ketone-butanol mixtures, each containing 0.05 <i>M </i>1-phenyl-3-methyl-4-butyrylpyrazolone (HBuP) have been studied. Fe(lII) was extracted quantitatively from 2.5-10 <i> M </i> HCI into 0.05 <i>M </i>HBuP-MIBK-BuOH. An optimum separation factor D_Fe/D_v = 10⁶ has been obtained for mixtures of both metals. Hence. Fe(III) is separated from V(V) in 6 <i>M </i> HCI using 0.05 <i>M </i> HBuP-MIBK-BuOH as the extractant. With 0.05 <i>M </i> HBuP-CHCl₃BuoH, V(V) is efficiently extracted from <i>0-9 M </i> HNO₃ into the organic phase. The study shows that Fe(III)is extracted as Fe(BuP)₃ species between 0-4<i>M </i> acid concentration, and as H₂BuP⁺FeCl<img src='http://www.niscair.res.in/jinfo/Subscript4.gif' border=0> species between 6-10 <i>M </i> (HCI) acid concentration. Vanadium is extracted as VO₂(BuP).HBuP species from acid solutions.