Liquid‐liquid extraction of metal salts from acidic solutions using amine salts: Derivation of a formula for D o/a

Abstract In this article on the SX of metal salts by amine salts some formulae have been derived for the distribution ratio D o/a for a metal salt, partitioning between an acidic aqueous layer and an organic phase, containing amine salts. The effects of association of the amine salt, or of the extracted complex or both, are taken into account, as is the effect of the simultaneous extraction of two or more metal salts, the formation of more than one complex per metal salt and the presence of different kinds of anions. The ways, in which formulae may be derived, if two or more active solvents are present in the organic phase at the same time, or when the diluent does not behave inertly, are outlined.