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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

508
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...
508

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Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues
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Microwave-Assisted Lignin Extraction-Utilizing Deep Eutectic Solvents to Their Full Potential.

Alina Meindl1, Alexander Petutschnigg1,2,3, Thomas Schnabel1,4

  • 1Forest Products Technology and Timber Constructions Department, Salzburg University of Applied Sciences, Markt 136a, 5431 Kuchl, Austria.

Polymers
|October 27, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a green and efficient method for extracting lignin using deep eutectic solvents and microwave heating. This novel approach significantly reduces extraction time and energy costs for lignin valorisation.

Keywords:
circular economydeep eutectic solventsgreen extraction processlignin valorisationmicrowave

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Area of Science:

  • Green Chemistry
  • Biomass Valorisation
  • Separation Science

Background:

  • Lignin, a abundant biopolymer, offers a sustainable alternative to fossil-fuel-based materials.
  • Efficient extraction of lignin from plant biomass remains a significant challenge.
  • Current methods for lignin extraction are often time-consuming and energy-intensive.

Purpose of the Study:

  • To investigate the efficacy of choline-chloride-based deep eutectic solvents for microwave-assisted lignin extraction.
  • To develop a rapid, green, and scalable methodology for lignin isolation from untreated larch bark.
  • To compare the efficiency of microwave-assisted extraction with conventional heating methods.

Main Methods:

  • Utilized various choline-chloride-based deep eutectic solvents with different hydrogen bond donors (acid-based, hydroxyl-based, amide-based).
  • Employed microwave irradiation for lignin extraction from untreated larch bark.
  • Evaluated extraction yields, reaction times, and energy consumption.

Main Results:

  • Achieved high lignin yields of up to 96% within a 30-minute microwave irradiation period.
  • Demonstrated an 87% reduction in reaction time and a 93.5% decrease in energy costs compared to conventional heating.
  • Identified suitable deep eutectic solvent systems for efficient microwave lignin extraction.

Conclusions:

  • Microwave-assisted deep eutectic solvent extraction offers a highly efficient and energy-saving approach for lignin valorisation.
  • The developed methodology is straightforward, green, scalable, and utilizes readily available materials.
  • This study provides a novel pathway for sustainable lignin extraction, minimizing the need for specialized equipment.