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Related Concept Videos

Solvents01:12

Solvents

A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...

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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

Efficient cellulose solvent: quaternary ammonium chlorides.

Marc Kostag1, Tim Liebert, Omar A El Seoud

  • 1Center of Excellence for Polysaccharide Research, Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University of Jena, Humboldtstraße 10, 07743, Jena, Germany.

Macromolecular Rapid Communications
|September 10, 2013
PubMed
Summary
This summary is machine-generated.

New tetraalkylammonium chlorides offer an efficient and cost-effective method for dissolving cellulose. These novel cellulose solvents eliminate the need for pretreatment, simplifying cellulose processing compared to traditional methods.

Keywords:
N,N-dimethylacetamidecellulose dissolutionionic liquidsquaternary ammonium saltsviscosity

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Chemistry

Background:

  • Cellulose chemistry traditionally relies on solvents like N,N-dimethylacetamide (DMA)/LiCl or ionic liquids.
  • These established solvents often require specific pretreatment steps for cellulose dissolution.
  • Existing methods present certain disadvantages in terms of cost, efficiency, or environmental impact.

Purpose of the Study:

  • To introduce a new class of cellulose solvents based on quaternary tetraalkylammonium chlorides.
  • To investigate the efficacy of these novel electrolytes in dissolving cellulose.
  • To compare the performance of these new solvents with established systems like DMA/LiCl.

Main Methods:

  • Synthesis of pure quaternary tetraalkylammonium chlorides via Menshutkin quaternization.
  • Dissolution of cellulose in molten tetraalkylammonium chlorides and in mixtures with cosolvents like DMA.
  • Characterization of cellulose solubility and system viscosity.

Main Results:

  • Quaternary tetraalkylammonium chlorides were synthesized in high yields and purity.
  • Pure molten electrolytes dissolved up to 15 wt% of cellulose.
  • Cellulose dissolved in DMA/quaternary ammonium chlorides without pretreatment, unlike the DMA/LiCl system.
  • Addition of cosolvents like DMA reduced system viscosity.

Conclusions:

  • Tetraalkylammonium chlorides represent a novel and effective class of cellulose solvents.
  • These solvents offer advantages over DMA/LiCl and ionic liquids, including simplified processing.
  • The developed synthesis route is inexpensive and facile, making these electrolytes practical for industrial applications.