The Distribution of 2-Thenoyltrifluoroacetone between Several Organic Solvents and an Aqueous Solution and Its Extraction of Sodium (I) into Methyl Isobutyl Ketone

Abstract

Aqueous solutions containing sodium hydroxide and sodium perchlorate at various mixing ratios, 1 m Na-(OH, ClO4), were equilibrated with several organic solvents containing 2-thenoyltrifluoroacetone (TTA) at 25°. From the measurements of the hydrogen-ion concentration of the aqueous phase, the (KD+l)Ka−1 values, where KD is the distribution constant and Ka is the acid dissociation constant of TTA, were obtained; they were, 107.17(hexane), 107.74 (CCl4), 108.01 (C6H6) and 108.17 (CHCl3). From the values of KD obtained in another study, the value of Ka was determined to be 10−6.28. However, a much lower value than that expected was obtained for the MIBK system; this was due to the extraction of sodium (I) with TTA. The extraction was also confirmed by the distribution experiments of sodium (I). The extraction constant, Kex=[NaA]org/[Na+] [A−] (where A− is the TTA anion), was found from these results to be 100.86 in 1 M NaClO4 and 100.79 at an infinite dilution.

Highly efficient and stable adsorption of lithium from brine with microcapsules containing 1-phenylazo-2-naphthol and trioctylphosphine oxide

“…8 Among these, the chelating extraction system is a special method. For example, Serine 9 et al reported that the chelating extraction system has inferior extraction ability for most alkali metal ions except for Li + because Li + can be chelated to form bonds, which are difficult to form with other alkali metal ions (e.g., Na + ). Therefore, the chelating extraction system always exhibits good selectivity for extracting lithium.…”

Solvent extraction and stripping of lithium ion from aqueous solution and its application to seawater

“…It is well known that TTA forms adduct or ion-pair with trioctylphosphine oxide (TOPO) to create a synergistic effect, which increases the extraction efficiencies of metallic ions. Many researchers studied solvent extraction of metallic ions using TTA and TOPO [7][8][9][10][11][12][13][14][15][16]. Noro and Sekine [11] studied the synergistic extraction of lanthanide using TTA with TOPO or tetrabutylammonium ions (TBA ? )…”

“…and reported the distribution coefficient and equilibrium constant. Sekine et al [12][13][14][15] also performed several researches on the solvent extraction of metallic ions with the same extractants. Takazawa et al [16] reported thermodynamic study on the synergistic extraction of cobalt (II) with b-diketone and TTA.…”