Solid-liquid phase behavior of eutectic solvents containing sugar alcohols
authors Silva, LP; Martins, MAR; Abranches, DO; Pinho, SP; Coutinho, JAP
nationality International
journal JOURNAL OF MOLECULAR LIQUIDS
author keywords Deep Eutectic Solvents; Sugar alcohols; Cholinium chloride; Solid-liquid equilibrium; Phase diagrams
keywords CHOLINE-CHLORIDE; MIXTURES; CRYSTALLIZATION; SUBLIMATION; DESIGN; FUSION; STATE; ACID
abstract Mixtures of carbohydrates are often reported in the literature as deep eutectic solvents yet, in most cases, their solid-liquid phase diagrams are poorly characterized and no evidence is available to validate this classification. In this work, the phase diagrams of the binary systems composed of the sugar alcohols mannitol or maltitol and meso-erythritol, xylitol, or sorbitol, were experimentally determined. The results obtained reveal that these systems have a thermodynamic ideal behavior, questioning their classification as deep eutectic solvents and showing that intermolecular hydrogen bonding between the components of a mixture is not a sufficient condition to prepare deep eutectic solvents. The phase diagrams of the systems composed of mannitol or maltitol and cholinium chloride were also measured in this work. In sharp contrast to the mixtures composed solely by sugar alcohols, and unlike numerous other choline-based eutectic systems reported in the literature, these systems revealed significant deviations to thermodynamic ideality, leading to significant melting temperature depressions. The Cl-OH interaction between cholinium chloride and the sugar alcohols is identified as the main reason for these deviations to ideality, paving the way for the rational choice of hydrogen bond acceptors to prepare deep eutectic solvents. (C) 2021 Elsevier B.V. All rights reserved.
publisher ELSEVIER
issn 0167-7322
isbn 1873-3166
year published 2021
volume 337
digital object identifier (doi) 10.1016/j.molliq.2021.116392
web of science category 9
subject category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
unique article identifier WOS:000681039600042
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journal impact factor 5.065
5 year journal impact factor 4.766
category normalized journal impact factor percentile 81.277
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