Greener Terpene-Terpene Eutectic Mixtures as Hydrophobic Solvents
authors Martins, MAR; Silva, LP; Schaeffer, N; Abranches, DO; Maximo, GJ; Pinho, SP; Coutinho, JAP
nationality International
journal ACS SUSTAINABLE CHEMISTRY & ENGINEERING
author keywords terpenes; eutectic mixtures; tunable; SLE; COSMO-RS; physicochemical properties
keywords SOLUBILITY; BEHAVIOR; BIOMASS; SYSTEMS; MODEL
abstract Natural products can be the basis for the development of green solvents, relevant for the advancement of new, more sustainable processes and products. In this work, 10 binary mixtures constituted by terpenes are prepared and characterized. Their solid-liquid phase diagrams show that room-temperature solvents can be prepared from solid terpenes in a wide composition range. These diagrams are accurately described by the conductor-like screening model for real solvents, showing it to be a useful predictive tool for the design of novel natural solvents. At the eutectic point, these mixtures possess low viscosities, densities lower than water, and high boiling temperatures. The low water solubility in the eutectic solvents together with its negligible impact on the properties measured is a strong indicator of the hydrophobic character of these mixtures. The tunable character of these mixtures is demonstrated by studying the solvatochromic parameters in the entire concentration region, the properties of the final solvents being tuned by simply varying the mole fraction of the terpenes. The high potential of this tunable character is shown in the selective extraction of dyes from their aqueous solutions. This work is expected to devise new insights concerning these solvents as well as to boost their application in green industrial processes.
publisher AMER CHEMICAL SOC
issn 2168-0485
year published 2019
volume 7
issue 20
beginning page 17414
ending page 17423
digital object identifier (doi) 10.1021/acssuschemeng.9b04614
web of science category Chemistry, Multidisciplinary; Green & Sustainable Science & Technology; Engineering, Chemical
subject category Chemistry; Science & Technology - Other Topics; Engineering
unique article identifier WOS:000492117200052
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