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Related Concept Videos

Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
Factors Affecting Solubility04:01

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
Common Ion Effect03:24

Common Ion Effect

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

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Updated: Jun 19, 2026

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
10:42

Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

Published on: August 10, 2016

Ionic liquids in refinery desulfurization: comparison between biphasic and supported ionic liquid phase suspension

Esther Kuhlmann1, Marco Haumann, Andreas Jess

  • 1Universität Erlangen-Nürnberg, Lehrstuhl für Chemische Reaktionstechnik, Egerlandstr. 3, 91058 Erlangen, Germany.

Chemsuschem
|October 3, 2009
PubMed
Summary

Ionic liquids effectively remove sulfur compounds from fuels. Supported ionic liquid phase (SILP) materials offer enhanced desulfurization efficiency, reducing sulfur content to very low levels with improved ionic liquid utilization.

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Published on: March 24, 2018

Area of Science:

  • Green Chemistry and Engineering
  • Separation Science
  • Petroleum Refining

Background:

  • Sulfur compounds in fuels cause environmental pollution and catalyst poisoning.
  • Traditional desulfurization methods face challenges with efficiency and environmental impact.
  • Ionic liquids (ILs) show promise as selective extraction media for fuel desulfurization.

Purpose of the Study:

  • To evaluate the desulfurization efficiency of various imidazolium phosphate ionic liquids.
  • To investigate the performance of supported ionic liquid phase (SILP) materials for enhanced sulfur removal.
  • To explore regeneration methods for the ionic liquids used in the process.

Main Methods:

  • Extraction of sulfur compounds (dibenzothiophene, butylmercaptan) from model fuel systems using imidazolium phosphate ionic liquids.
  • Comparison of single-stage and multistage extraction processes.
  • Preparation and evaluation of supported ionic liquid phase (SILP) materials on porous silica.
  • Regeneration of ionic liquids via distillation and re-extraction.

Main Results:

  • Single-stage extraction reduced sulfur content from 500 ppm to 200 ppm.
  • Multistage extraction lowered sulfur content to <10 ppm within seven stages.
  • SILP materials demonstrated superior performance, reducing sulfur to <100 ppm in one stage and 50 ppm in two stages.
  • Efficient regeneration of ionic liquids was achieved.

Conclusions:

  • Imidazolium phosphate ionic liquids are effective for fuel desulfurization.
  • SILP technology significantly enhances desulfurization efficiency and ionic liquid utilization.
  • SILP materials overcome mass transport limitations, enabling packed-bed column applications.