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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

487
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...
487

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Related Experiment Video

Updated: Jul 20, 2025

Ultrafast Lignin Extraction from Unusual Mediterranean Lignocellulosic Residues
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Lignin with controlled structural properties by N-heterocycle-based deep eutectic solvent extraction.

Kuan-Ting Lin1, Chenxi Wang1, Mond F Guo1

  • 1Voiland School of Chemical Engineering & Bioengineering, Washington State University, Richland, WA 99354.

Proceedings of the National Academy of Sciences of the United States of America
|July 31, 2023
PubMed
Summary

Researchers developed a novel deep eutectic solvent for efficient lignin extraction from biomass. This method allows for controlled lignin properties, overcoming previous utilization barriers.

Keywords:
bioenergydeep eutectic solventlignocellulose biomassnative lignin extraction

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Area of Science:

  • Biomass Valorization
  • Green Chemistry
  • Macromolecular Chemistry

Background:

  • Lignin's complex structure hinders its industrial utilization.
  • Current extraction methods often degrade lignin, limiting its application.
  • A need exists for methods to extract lignin with controlled structural integrity.

Purpose of the Study:

  • To develop a novel deep eutectic solvent (DES) for efficient lignin extraction.
  • To achieve lignin extraction with tunable structural properties.
  • To enable the utilization of lignin in various conversion processes.

Main Methods:

  • Utilized an N-heterocycle-based deep eutectic solvent (DES) formed from lactic acid and pyrazole (La-Py DES).
  • Optimized extraction conditions including temperature (90-145 °C) and DES composition.
  • Analyzed extracted lignin for yield, color, ether linkage content, hydroxyl group content, and molecular weight.

Main Results:

  • Achieved up to 93.7% lignin extraction yield from wheat straw.
  • Demonstrated control over lignin's ether linkage content, hydroxyl group content, and molecular weight.
  • Produced light-colored, native-like lignin (up to 80% yield) under mild conditions (90-120 °C).
  • Obtained ether linkage-free lignin with low polydispersity at 145 °C.

Conclusions:

  • The La-Py DES offers a new strategy for native lignin extraction.
  • This method enables the generation of lignin with tailored structural properties.
  • Facilitates enhanced lignin utilization in biorefineries and chemical industries.