Comparison of 1-Octanol with Benzene in the Extraction of Copper(II) with Various Phenylcarboxylic Acids

Abstract

The solvent extraction of copper(II) with 3-phenylpropanoic, 4-phenylbutanoic, and 2-phenylbutanoic acids was carried out using 1-octanol and benzene as solvents at 25˚C and at an aqueous ionic strength of 0.1 mol dm -3 (NaClO4). Each extraction equilibrium for these systems was determined in detail by a slope analysis and curve-fitting method. In the aqueous solution, the formation constants of copper(II) with these phenylcarboxylate anions were potentiometrically determined. The present results have been compared with the previous results for the extraction of copper(II) with phenylacetic acid using 1-octanol and benzene as solvents. Between the partition constants of CuA2 and HA (HA: phenylcarboxylic acid), the following relationship was set up: log KD,CuA2=1.8log KD,HA-1.5 for four kinds of phenylcarboxylic acids in the 1-octanol systems. Although a remarkable difference in the extracted species between the benzene and 1-octanol systems was observed, the extraction constants of dimeric copper(II) species and dimerization constants in these extraction equilibria were found to show a high correlation between the 1-octanol and benzene systems. The dimerization constants of copper(II) carboxylates in the 1-octanol systems increased with the number of carbon atoms in the acids: phenylacetic<3-phenylpropanoic<4-phenylbutanoic 2-phenylbutanoic acids, and the extraction constants of the dimeric species, Cu2A4(HA)2 in the benzene systems decreased in the order: 2-phenylbutanoic>phenylacetic>3-phenylpropanoic>4-phenylbutanoic acids. In the systems using 1-octanol and benzene, 2-phenylbutanoic acid was superior to the other phenylcarboxylic acids as an extractant for copper(II).

Equilibrium Studies on the Synergic Liquid‐Liquid Extraction Process of Copper(II) from Sulphate Media with Mixtures of some Bidentate Mono‐Schiff Bases and Acyclic Polyether Non‐ionic Surfactant in Chloroform

“…Comparing the stoichiometry of the extracted complexes found in this study with those reported by Haragushi [55] , Yamada [56] , and Naito [57] , the formation of similar complexes with other extractants in a perchlorate medium has been found. Moreover, as the partition of HL towards the aqueous phase is very low [58] , the relationship between the distribution ratio, D M , of the Cu(II) and the extraction constant, K ex , can be expressed as: …”

Synergistic Effect of Sodium Dodecyl Sulfate Micelles on Copper(II) Extraction from Saline Sulfate Medium with Some Ortho-Hydroxy-Schiff Base Chelating Extractants

“…Based on the results of the slope analysis data, it can be concluded that copper(II) is extracted with HSA and HNA as a1:3 chelate ML 2 (HL) (self adduct), and with HNN as a1:2 chelate ML 2 (non-adduct). Besides, the extraction process can be described by the following two equilibrium reactions: [8], and Naito [35], the formation of similar complexes with other ligands in aperchlorate medium has been found.…”

Solvent extraction of some metal ions with di‐2‐methylnonylphosphoric acid into heptane

“…In this work, the extraction behavior of some metal ions with DMNPA in heptane was investigated, and the extracted species and the extraction constants of metal ions were evaluated using slope analysis10, 11 and curve fitting 12–15…”