Abstract
The present paper is aimed at obtaining quantitative information on the extraction of polyvanadates from aqueous solutions with benzene solutions of tri-n-octylamine and Primene JMT with respect to initial pH value of aqueous solution and the ratio of volumes of the organic and aqueous phase. The predominant species in acidic solutions at concentrations in excess of 0.01 M are decavanadates. The extraction equilibria were studied within the range of pH 2–4. At this concentration of sulfuric acid the species V10O26(OH)4− and V10O27(OH)5− prevail. Supposing that the nonideality of the aqueous phase does not play an important role and that the activity coefficient of the amine sulfate remains constant, the nonideal behavior of the extraction system can be explained by the hydration of complexes in the organic phase. On the basis of suggested reactions and mass balance equations the comparison of experimental and calculated equilibrium data was done.
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