Liquid-Liquid Extraction of V(IV) from Sulphate Medium by Cyanex 301 Dissolved in Kerosene

Ranjit Kumar Biswas, Aneek Krishna Karmakar

Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi, Bangladesh.

DOI: 10.4236/ijnm.2013.21003                

Abstract

The equilibrium of extraction of V(IV) in the V(IV)- SO₄^2- (H⁺, Na⁺)-Cyanex 301 (HA)-kerosene system has been studied. Significant extraction occurs above pH 1 within 10 min. ^CD (extraction ratio at constant pH_(eq) and [HA]_(o,eq)) value is slightly decreased with increasing [V(IV)]_(ini). ^CD is found to be directly proportional to [H⁺]^-n (n ≤ 2), [HA] ² and (1+1.58 [SO₄^2-]). The process is endothermic (DH = 16 kJ/mol). Apparent K_exvalues at 303 K are 10^_-1.419 and 10^_-0.94 in 0.10 and 1.50 mol/L SO₄^2- medium, respectively. The loading capacity is calculated to be7.87 gV(IV) per100 g Cyanex 301. Kerosene appears as the best diluent. Stripping to the extents of 100%, 94% and 97.7% are possible in single stage by 1 mol/L H₂SO₄, HCl and HNO₃, respectively. Separations of V(IV) from Cu(II) (at pH 0), Zn(II) (at pH 0.5) and Fe(III) (at pH 1.0) by Cyanex 301 are possible.

Keywords

Extraction Equilibrium; Vanadium(IV); Cyanex 301; Kerosene; Sulphate

Conflicts of Interest

The authors declare no conflicts of interest.

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