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Using Porous Liquids to Perform Liquid-Liquid Separations.

Beibei Lai1, Deborah E Crawford2, Haochen Wu1

  • 1School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, UK.

Angewandte Chemie (International Ed. in English)
|July 10, 2024
PubMed
Summary
This summary is machine-generated.

Porous liquids (PLs) offer a novel method for separating miscible liquids like MEG/water and alcohol/water mixtures. These stable PLs can be regenerated and reused, showing potential for industrial liquid-liquid separation applications.

Keywords:
Alcohol water separationLiquid-liquid separationMono ethylene glycolPorous liquids

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Porous liquids (PLs) are fluid sorbents primarily studied for gas mixture separation.
  • Separating miscible liquids, such as monoethylene glycol (MEG) from water, presents significant industrial challenges.
  • Conventional solvent extraction methods for MEG recovery from water are often inefficient.

Purpose of the Study:

  • To investigate the efficacy of porous liquids (PLs) for the separation of miscible liquid mixtures.
  • To demonstrate the application of PLs in recovering monoethylene glycol (MEG) from aqueous solutions.
  • To explore the potential of PLs for reducing alcohol concentration in beverages.

Main Methods:

  • Formulation of physically stable porous liquids (PLs) by dispersing ZIF-8 in polydimethylsilicone (PDMS) or sesame oil.
  • Utilizing a 5 nm PEEK membrane as a barrier between the PL and the liquid mixture.
  • Testing the selective extraction of MEG from MEG/water mixtures and alcohol from beverages using PLs.

Main Results:

  • Porous liquids (PL1 and PL2) exhibited excellent physical stability and were effective in selectively extracting MEG from water, even at low concentrations (3:97 wt%).
  • The PLs demonstrated successful regeneration and reusability, indicating suitability for continuous cyclic extraction processes.
  • A different PL formulation (PL3, silicalite-1@PDMS) effectively extracted alcohol from beverages, showing potential for alcohol content reduction.

Conclusions:

  • Porous liquids, owing to their inherent empty pore structure and high solubility, are applicable to liquid-liquid separations, not just gas mixtures.
  • The developed PLs offer a promising, reusable, and potentially continuous method for industrial MEG recovery and alcohol concentration adjustment in beverages.
  • This study expands the application scope of porous liquids into the domain of liquid-liquid separation technologies.