Aggregation, reversed micelles, and microemulsions in liquid-liquid extraction: the tri-n-butyl phosphatediluent-water-electrolyte system

Kwadwo Asare Osseo-Asare

doi:10.1016/0001-8686(91)80041-H

Aggregation, reversed micelles, and microemulsions in liquid-liquid extraction: the tri-n-butyl phosphatediluent-water-electrolyte system

Kwadwo Asare Osseo-Asare

Research output: Contribution to journal › Article › peer-review

181 Scopus citations

Abstract

The experimental evidence (e.g. distribution, viscosity, conductivity, and molecular weight measurements) suggesting the presence of aggregates in TBP extracts is assembled and critically reviewed. A variety of TBP-bascd systems are considered, such as TBP-Diluent, TBP-H₂O, TBP-Diluent-H₂O, TBP-H₂O-Acid, TBP-Diluent-H₂O-Acid, TBP- H₂O-Acid-Metal Salt, TBP-Diluent-H₂O-Acid-Metal Salt, TBP-H₂O-Metal Salt, and TBP-Diluent-H₂O-Metal Salt. It is demonstrated that aggregation is favored by high acidities and high metal concentrations. Organic extracts derived from highly acidic aqueous solutions and/or highly concentrated metal salt solutions tend to contain ion-pairs or ion-multiplets predominantly. These species possess significant amphiphilic character since they contain both hydrophobic (i.e., trialkyl radicals) and hydrophilic (i.e., P=O(H₂O)_xM^z+ and/or P=O(H₂O)_xH⁺) groups. On the basis of current notions of aggregation and solubilization in surfactant solutions, arguments are presented for possible formation of reversed micellar structures and microemulsions in TBP solvent systems.

Original language	English (US)
Pages (from-to)	123-173
Number of pages	51
Journal	Advances in Colloid and Interface Science
Volume	37
Issue number	1-2
DOIs	https://doi.org/10.1016/0001-8686(91)80041-H
State	Published - Jan 1 1991

All Science Journal Classification (ASJC) codes

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

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title = "Aggregation, reversed micelles, and microemulsions in liquid-liquid extraction: the tri-n-butyl phosphatediluent-water-electrolyte system",

abstract = "The experimental evidence (e.g. distribution, viscosity, conductivity, and molecular weight measurements) suggesting the presence of aggregates in TBP extracts is assembled and critically reviewed. A variety of TBP-bascd systems are considered, such as TBP-Diluent, TBP-H2O, TBP-Diluent-H2O, TBP-H2O-Acid, TBP-Diluent-H2O-Acid, TBP- H2O-Acid-Metal Salt, TBP-Diluent-H2O-Acid-Metal Salt, TBP-H2O-Metal Salt, and TBP-Diluent-H2O-Metal Salt. It is demonstrated that aggregation is favored by high acidities and high metal concentrations. Organic extracts derived from highly acidic aqueous solutions and/or highly concentrated metal salt solutions tend to contain ion-pairs or ion-multiplets predominantly. These species possess significant amphiphilic character since they contain both hydrophobic (i.e., trialkyl radicals) and hydrophilic (i.e., P=O(H2O)xMz+ and/or P=O(H2O)xH+) groups. On the basis of current notions of aggregation and solubilization in surfactant solutions, arguments are presented for possible formation of reversed micellar structures and microemulsions in TBP solvent systems.",

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N2 - The experimental evidence (e.g. distribution, viscosity, conductivity, and molecular weight measurements) suggesting the presence of aggregates in TBP extracts is assembled and critically reviewed. A variety of TBP-bascd systems are considered, such as TBP-Diluent, TBP-H2O, TBP-Diluent-H2O, TBP-H2O-Acid, TBP-Diluent-H2O-Acid, TBP- H2O-Acid-Metal Salt, TBP-Diluent-H2O-Acid-Metal Salt, TBP-H2O-Metal Salt, and TBP-Diluent-H2O-Metal Salt. It is demonstrated that aggregation is favored by high acidities and high metal concentrations. Organic extracts derived from highly acidic aqueous solutions and/or highly concentrated metal salt solutions tend to contain ion-pairs or ion-multiplets predominantly. These species possess significant amphiphilic character since they contain both hydrophobic (i.e., trialkyl radicals) and hydrophilic (i.e., P=O(H2O)xMz+ and/or P=O(H2O)xH+) groups. On the basis of current notions of aggregation and solubilization in surfactant solutions, arguments are presented for possible formation of reversed micellar structures and microemulsions in TBP solvent systems.

AB - The experimental evidence (e.g. distribution, viscosity, conductivity, and molecular weight measurements) suggesting the presence of aggregates in TBP extracts is assembled and critically reviewed. A variety of TBP-bascd systems are considered, such as TBP-Diluent, TBP-H2O, TBP-Diluent-H2O, TBP-H2O-Acid, TBP-Diluent-H2O-Acid, TBP- H2O-Acid-Metal Salt, TBP-Diluent-H2O-Acid-Metal Salt, TBP-H2O-Metal Salt, and TBP-Diluent-H2O-Metal Salt. It is demonstrated that aggregation is favored by high acidities and high metal concentrations. Organic extracts derived from highly acidic aqueous solutions and/or highly concentrated metal salt solutions tend to contain ion-pairs or ion-multiplets predominantly. These species possess significant amphiphilic character since they contain both hydrophobic (i.e., trialkyl radicals) and hydrophilic (i.e., P=O(H2O)xMz+ and/or P=O(H2O)xH+) groups. On the basis of current notions of aggregation and solubilization in surfactant solutions, arguments are presented for possible formation of reversed micellar structures and microemulsions in TBP solvent systems.

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Aggregation, reversed micelles, and microemulsions in liquid-liquid extraction: the tri-n-butyl phosphatediluent-water-electrolyte system

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