As a basic study of solvent extraction of metals with high molecular-weight amines, the measurement of the distribution equilibrium of zinc chloride between Amberlite LA-2, long-chain secondary alkylamine (n-lauryl trialkylmethylamine), dissolved in n-hexane and an aqueous solution of hydrochloric acid was carried out at 30°C over wide concentration ranges of amine, zinc chloride and hydrochloric acid.
It was clarified that zinc chloride is extracted by the following reaction:
ZnCl_2(aq.)+(BH Cl)_2(org.)^→_←(BH)₂ZnCl_4(org.)
The equilibrium constant for this reaction and the stability constants of the chloro complexes of zinc were determined.