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Related Concept Videos

Factors Affecting Solubility04:01

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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In Vitro Drug Dissolution: Alternative Methods01:17

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Alternative drug dissolution methods include the rotating bottle, intrinsic dissolution test, peristalsis, and the Franz diffusion cell method. The rotating bottle method involves meticulously rotating tightly capped controlled-release beads in a temperature-controlled bath. Periodic decanting of samples allows for residue assay, followed by refilling with fresh medium and testing at various pH levels to emulate the gastrointestinal tract conditions.In contrast, the intrinsic dissolution test...
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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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A morpholinium ionic liquid for cellulose dissolution.

Dilip G Raut1, Ola Sundman1, Weiqing Su1

  • 1Umeå University, Department of Chemistry, Chemical-Biology Centre, Technical Chemistry, SE-90187 Umeå, Sweden.

Carbohydrate Polymers
|June 17, 2015
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Summary
This summary is machine-generated.

A novel ionic liquid, N-allyl-N-methylmorpholinium acetate, efficiently dissolves cellulose without pre-treatment. This breakthrough preserves cellulose

Keywords:
AcetateAllylCelluloseDissolutionIonic liquidMorpholinium

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Green Chemistry

Background:

  • Cellulose dissolution is crucial for biomass processing.
  • Traditional methods often require harsh conditions or pre-treatment.
  • Developing efficient and eco-friendly cellulose solvents is a key challenge.

Purpose of the Study:

  • To synthesize novel morpholinium ionic liquids and allyl ammonium acetates.
  • To investigate the cellulose dissolution capability of these compounds.
  • To identify the key structural features responsible for efficient cellulose dissolution.

Main Methods:

  • Synthesis of substituted morpholinium ionic salts and allyl ammonium acetates.
  • Cellulose dissolution experiments at 120°C with varying cellulose degrees of polymerization (DPn).
  • Characterization of regenerated cellulose using SEC, SEM, XRD, TGA, CP/MAS (13)C NMR, and FTIR.

Main Results:

  • N-allyl-N-methylmorpholinium acetate ([AMMorp][OAc]) effectively dissolved native cellulose without pre-processing.
  • [AMMorp][OAc] dissolved up to 30 wt% cellulose (DPn 789) in 20 minutes at 120°C.
  • Regenerated cellulose showed no significant change in DPn, and its structure/morphology was well-preserved.

Conclusions:

  • The combination of a morpholinium cation, an allyl group, and an acetate anion is essential for efficient cellulose dissolution.
  • [AMMorp][OAc] is a promising solvent for cellulose processing, enabling regeneration without polymer degradation.
  • This study offers a greener approach to cellulose dissolution and functionalization.