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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

446
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...
446
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

486
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...
486
Entropy and Solvation02:05

Entropy and Solvation

7.1K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
7.1K
Ion Exchange01:17

Ion Exchange

592
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...
592
High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

477
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...
477
Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

247
Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
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Hydrocarbon Extraction with Ionic Liquids.

Gangqiang Yu1, Chengna Dai1, Ning Liu1

  • 1Faculty of Environment and Life, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing 100124, China.

Chemical Reviews
|March 6, 2024
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Ionic liquids (ILs) offer a sustainable alternative for hydrocarbon separation, improving efficiency and reducing energy consumption in processes like aromatics extraction and desulfurization. This review details IL applications, mechanisms, and future potential in chemical separations.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Physical Chemistry

Background:

  • Separation processes in the chemical industry are energy-intensive, with hydrocarbon purification being a major challenge in petroleum refinement.
  • Traditional organic solvents used in extraction suffer from issues like solvent loss, pollution, low efficiency, and high regeneration energy.
  • Ionic liquids (ILs) have emerged as promising, designable solvents for advanced chemical separation processes.

Purpose of the Study:

  • To provide a comprehensive review of the state-of-the-art progress in using ionic liquids (ILs) for extractive hydrocarbon separation.
  • To cover key aspects including molecular modeling, structure-property relationships, separation mechanisms, and industrial-scale process design.
  • To extend the discussion to IL analogs and deep eutectic solvents (DESs), outlining current challenges and future opportunities.

Main Methods:

  • Review of molecular thermodynamic models for IL systems to predict phase equilibria and screen IL candidates.
  • Analysis of structure-property relationships between ILs' ionic components and their separation performance (selectivity, distribution coefficients).
  • Examination of IL-related extractive separation mechanisms, focusing on intermolecular interactions.
  • Discussion of process simulation and industrial-scale design based on validated thermodynamic models.

Main Results:

  • ILs demonstrate significant potential for improving the efficiency and sustainability of hydrocarbon separations like aromatics extraction, desulfurization, and denitrification.
  • Molecular thermodynamic models facilitate rapid screening and accurate prediction of IL behavior in separation processes.
  • Understanding IL structure-property relationships and intermolecular interactions is crucial for optimizing separation performance.
  • Validated models enable the simulation and design of industrial-scale IL-based extraction processes.

Conclusions:

  • Ionic liquids represent a significant advancement over traditional solvents for extractive hydrocarbon separation, offering enhanced efficiency and reduced environmental impact.
  • The systematic review covers molecular to process scales, providing a valuable reference for IL applications and future research directions.
  • Further development in IL analogs and deep eutectic solvents (DESs) holds promise for addressing current challenges and expanding applications in chemical separations.