Abstract
Attempts have been made to identify the species formed in a heterogeneous equilibrium between aqueous hydrochloric acid and pure tributyl phosphate. In addition to the conventional distribution and water content determination, physical-chemical measurements of density, viscosity and conductivity of the organic layer were carried out. Two well defined species were found to exist as a result of solute-solvent interactions in the system studied. The first, formed at lower initial aqueous acid concentrations has the composition [(TBP) 2·HCl·(H 2O)] 6]; the second, formed at higher acid concentrations, has the general formula [TBP·HCl·(H 2O) 3]. The reactions involved have been suggested. The system studied is of interest in connection with the extraction of inorganic chlorides from hydrochloric acid solutions into tributyl phosphate.
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