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Article

Influence of Carboxylate Anions on Phase Behavior of Choline Ionic Liquid Mixtures

1
Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia
2
Forschungszentrum Jülich GmbH, Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Egerlandstr. 3, 91058 Erlangen, Germany
3
Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia
4
Department of Chemical and Biological Engineering (CBI), Institute of Chemical Reaction Engineering, University of Erlangen-Nuremberg, Egerlandstraße 3, 91058 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Molecules 2020, 25(7), 1691; https://doi.org/10.3390/molecules25071691
Received: 17 March 2020 / Revised: 30 March 2020 / Accepted: 2 April 2020 / Published: 7 April 2020
Mixing ionic liquids is a suitable strategy to tailor properties, e.g., to reduce melting points. The present study aims to widen the application range of low-toxic choline-based ionic liquids by studying eight binary phase diagrams of six different choline carboxylates. Five of them show eutectic points with melting points dropping by 13 to 45 °C. The eutectic mixtures of choline acetate and choline 2-methylbutarate were found to melt at 45 °C, which represents a remarkable melting point depression compared to the pure compounds with melting points of 81 (choline acetate) and 90 °C (choline 2-methylbutarate), respectively. Besides melting points, the thermal stabilities of the choline salt mixtures were investigated to define the thermal operation range for potential practical applications of these mixtures. Typical decomposition temperatures were found between 165 and 207 °C, with choline lactate exhibiting the highest thermal stability. View Full-Text
Keywords: choline; eutectic mixture; differential scanning calorimetry; ionic liquid; phase diagram choline; eutectic mixture; differential scanning calorimetry; ionic liquid; phase diagram
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MDPI and ACS Style

Elhi, F.; Gantman, M.; Nurk, G.; Schulz, P.S.; Wasserscheid, P.; Aabloo, A.; Põhako-Esko, K. Influence of Carboxylate Anions on Phase Behavior of Choline Ionic Liquid Mixtures. Molecules 2020, 25, 1691. https://doi.org/10.3390/molecules25071691

AMA Style

Elhi F, Gantman M, Nurk G, Schulz PS, Wasserscheid P, Aabloo A, Põhako-Esko K. Influence of Carboxylate Anions on Phase Behavior of Choline Ionic Liquid Mixtures. Molecules. 2020; 25(7):1691. https://doi.org/10.3390/molecules25071691

Chicago/Turabian Style

Elhi, Fred, Mikhail Gantman, Gunnar Nurk, Peter S. Schulz, Peter Wasserscheid, Alvo Aabloo, and Kaija Põhako-Esko. 2020. "Influence of Carboxylate Anions on Phase Behavior of Choline Ionic Liquid Mixtures" Molecules 25, no. 7: 1691. https://doi.org/10.3390/molecules25071691

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