Studies on the System Perchloric Acid-Water-Tri-n-Butyl Phosphate

Abstract

It is intended in this study on the system HClO₄-H₂O-TBP to determine the species formed in the equilibrated organic phase and to clarify the extraction equilibrium in a part of the system. On the same line as the previous papers published in this Memoir, physico-chemical measurements of volume swelling, density, viscosity and electrical conductivity were carried out on the organic phase in addition to the distribution measurements of perchloric acid and water between organic and aqueous phases. The extracting species determined are summarized in Table 1. The species at lower acidity regions are supposed to be almost completely ionized. Dehydration of the organic phase occurs at higher acidity regions. The activities and activity coefficients of the two species [TBP·H₂O] and [(TBP)₂₀H₃O+(H₂O)₂₃]+[ClO₄⁻] stable at the lowest acidity region were determined with Redlich-Kister equations.