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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...

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Updated: Dec 14, 2025

Analysis of Complex Molecules and Their Reactions on Surfaces by Means of Cluster-Induced Desorption/Ionization Mass Spectrometry

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Published on: March 1, 2020

Understanding the Complex Surface Interplay for Extraction: A Molecular Dynamics Study.

Roberto Macchieraldo¹, Johannes Ingenmey¹, Barbara Kirchner¹

¹Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstrasse 4+6, 53115, Bonn, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|July 16, 2020

Summary

This summary is machine-generated.

Molecular dynamics simulations reveal that tri-n-butyl phosphate enhances solvent miscibility for liquid-liquid extraction, while LiCl reduces it. The extractant preferentially orients at the interface, but LiCl disrupts this structure.

Keywords:

interfaces liquid-liquid extraction molecular dynamics phase separation solvometallurgy

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Area of Science:

Physical Chemistry
Materials Science

Background:

Non-aqueous liquid-liquid extraction is crucial for various chemical processes.
Understanding solvent-solvent and solute-solvent interactions at interfaces is key to optimizing extraction efficiency.

Purpose of the Study:

To investigate the interfacial properties of methanol and n-dodecane mixtures.
To assess the impact of tri-n-butyl phosphate (TBP) and LiCl concentrations on interfacial behavior and miscibility.
To elucidate the adsorption and orientation of TBP at the solvent interface.

Main Methods:

Classical molecular dynamics (MD) simulations were employed.
Two distinct system models were utilized to analyze the effects of TBP and LiCl.
Interfacial properties, mutual solubility, and molecular adsorption/orientation were evaluated.

Main Results:

Tri-n-butyl phosphate (TBP) was found to increase the mutual solubility of methanol and n-dodecane.
Lithium chloride (LiCl) addition counteracted the solubilizing effect of TBP.
TBP adsorbed at the interface, exhibiting preferential orientation with butyl chains towards n-dodecane and the phosphate group towards methanol.
LiCl hindered TBP diffusion into the methanol phase, increasing interfacial concentration and disrupting TBP's ordered orientation.

Conclusions:

TBP acts as a compatibilizer, enhancing miscibility, while LiCl acts as an anti-solvent.
The interfacial structure and TBP orientation are sensitive to the concentrations of both TBP and LiCl.
These findings provide insights for designing efficient non-aqueous liquid-liquid extraction systems.