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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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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 formed in...
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Related Experiment Video

Updated: Jun 7, 2026

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
06:31

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Published on: November 27, 2015

Ionic liquid silver salt complexes for propene/propane separation.

Friederike Agel1, Fee Pitsch, Florian Felix Krull

  • 1Chemical Reaction Engineering, Friedrich-Alexander-University Erlangen-Nuremberg, Egerlandstrasse 3, D-91058 Erlangen, Germany. friederike.agel@crt.cbi.uni-erlangen.de

Physical Chemistry Chemical Physics : PCCP
|November 5, 2010
PubMed
Summary
This summary is machine-generated.

This study explores a novel liquid complex salt for separating propane and propene. The ionic liquid [Ag(propene)(x)][Tf(2)N] shows promise for membrane applications due to selective propene solubility.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Separation Science

Background:

  • Immobilised liquid membranes (ILMs) are crucial for gas separations.
  • Propane/propene separation presents significant industrial challenges.
  • Ionic liquids offer tunable properties for advanced membrane applications.

Purpose of the Study:

  • To evaluate the [Ag(propene)(x)][Tf(2)N] complex salt as an active layer in ILMs for propane/propene separation.
  • To determine the formation conditions and thermal stability of the complex salt.
  • To investigate the solubility and diffusivity of propane and propene within the ionic liquid.

Main Methods:

  • Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) for thermal properties.
  • Pressure-dependent solubility and diffusivity measurements.
  • Complex formation pressure/temperature range determination.

Main Results:

  • The [Ag(propene)(x)][Tf(2)N] ionic liquid exhibits suitable properties for ILM applications.
  • Membrane selectivity is primarily governed by solubility differences.
  • Propene exhibits a lower self-diffusion coefficient than propane due to temporary binding with silver ions.

Conclusions:

  • The studied ionic liquid is a promising candidate for active separation layers in propane/propene ILMs.
  • Solubility selectivity is the key factor driving the separation efficiency.
  • The temporary binding of propene to silver ions enhances separation performance.