Journal
PURE AND APPLIED CHEMISTRY
Volume 91, Issue 8, Pages 1341-1349Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/pac-2018-1014
Keywords
deep eutectic solvent; eutectic mixture; ISSP-18; phase behavior; solid-liquid coexistence; thermodynamic modelling
Categories
Funding
- European Union's Horizon 2020 research and innovation programme [668970]
- Netherlands Organisation for Scientific Research (NWO) [722.017.005]
- Altri -Celbi
- Crown Van Gelder
- CTP
- DS Smith Paper
- ESKA
- Essity
- Holmen
- ISPT
- Mayr-Melnhof Eerbeek
- Metsa Fibre
- Mid Sweden University
- Mondi
- Omya
- Parenco BV
- Navigator Company
- Sappi
- Smurfit Kappa
- Stora Enso
- Eindhoven University of Technology
- University of Aveiro
- University of Twente
- UPM
- Valmet Technologies Oy
- Voith Paper
- VTT Technical Research Centre of Finland Ltd
- WEPA
- Zellstoff Pols
- Buckman
- H2020 Societal Challenges Programme [668970] Funding Source: H2020 Societal Challenges Programme
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Compared to conventional solvents used in the chemical industry, deep eutectic solvents (DESs) are considered as promising potentially sustainable solvents. DESs are binary mixtures and the resulting liquid mixture is characterized by a large melting point depression with respect to the melting temperatures of its constituents. The relative melting point depression becomes larger as the two components have stronger attractive interactions, resulting in non-ideal behavior. The compositional range over which such binary mixtures are liquids is set by the location of the solid-liquid phase boundary. Here we present experimental phase diagrams of various recent and new DESs that vary in the degree of non-ideality. We investigate whether thermodynamic models are able to describe the solid-liquid equilibria and focus on relating the parameters of these models to the non-ideal behavior, including asymmetric behavior of the activity coefficients. It is shown that the orthogonal Redlich-Kister-like polynomial (OP) expansion, including an additional first order term, provides an accurate description. This theory can be considered as an extension of regular solution theory and enables physical interpretation of the fit parameters.
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