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The physicochemical and thermal properties of deep eutectic solvent with different hydrogen bond donor (alpha hydroxy acid and polyol)

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Apr 07, 2022 version files 479.74 KB

Abstract

Deep eutectic solvents (DESs) are a novel class of solvents that have gathered interest due to their unique properties particularly in its application of biomass fractionation. It is critical to study its properties from an engineering standpoint because of its importance in mass transfer, fluid mechanics, modelling, simulation and equipment design. The comparison of physicochemical and thermal properties of DESs has not been thoroughly investigated, particularly when a different functional group, such as alpha hydroxy acid (lactic acid, LA) or polyol (glycerol, Gly), is used as the hydrogen bond donor (HBD). Furthermore, understanding how molar ratios affect properties is crucial since they may be fine-tuned to meet the needs of specific applications. Thus, the purpose of this study is to determine the physicochemical properties (viscosity, density, refractive index and pH) and the thermal properties (freezing point and decomposition temperature) of DESs with different HBD functional groups (LA and Gly) at various molar ratios (1:2–1:10). The HBD’s functional groups and molar ratio change significantly impacted the properties due to hydrogen bonding sites and strength, alkyl chain length and molecular weight and electrostatic and dispersion interactions. The correlation between DESs molar ratios and properties is not always linearly due to eutectic phenomena.