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Annual Review of Chemical and Biomolecular Engineering

Volume 14, 2023

Everything You Wanted to Know about Deep Eutectic Solvents but Were Afraid to Be Told

Abstract

Are deep eutectic solvents (DESs) a promising alternative to conventional solvents? Perhaps, but their development is hindered by a plethora of misconceptions. These are carefully analyzed here, beginning with the very meaning of DESs, which has strayed far beyond its original scope of eutectic mixtures of Lewis or Brønsted acids and bases. Instead, a definition that is grounded on thermodynamic principles and distinguishes between eutectic and deep eutectic is encouraged, and the types of precursors that can be used to prepare DESs are reviewed. Landmark works surrounding the sustainability, stability, toxicity, and biodegradability of these solvents are also discussed, revealing piling evidence that numerous DESs reported thus far, particularly those that are choline based, lack sufficient sustainability-related traits to be considered green solvents. Finally, emerging DES applications are reviewed, emphasizing their most remarkable feature: the ability to liquefy a solid compound with a target property, allowing its use as a liquid solvent.

Keyword(s): deep eutectic solvents, eutectic mixtures, green chemistry, hydrogen bonding, melting temperature depression, solid–liquid equilibrium
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/content/journals/10.1146/annurev-chembioeng-101121-085323
2023-06-08
2024-04-27
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/content/journals/10.1146/annurev-chembioeng-101121-085323
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Everything You Wanted to Know about Deep Eutectic Solvents but Were Afraid to Be Told
Annual Review of Chemical and Biomolecular Engineering 14, 141 (2023); https://doi.org/10.1146/annurev-chembioeng-101121-085323
/content/journals/10.1146/annurev-chembioeng-101121-085323
/content/journals/10.1146/annurev-chembioeng-101121-085323
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