Ionic Liquids and Deep Eutectic Mixtures: Sustainable Solvents for Extraction Processes

ChemSusChem ◽  
2014 ◽  
Vol 7 (7) ◽  
pp. 1784-1800 ◽  
Author(s):  
Francisco Pena-Pereira ◽  
Jacek Namieśnik
Keyword(s):  
Ionic Liquids ◽  
Eutectic Mixtures ◽  
Sustainable Solvents ◽  
Extraction Processes

Green Chemistry and Green Solvents: An Overview

2020 ◽  
Vol 7 (3) ◽  
pp. 314-325
Author(s):  
Barla Karuna Devi ◽  
Swathi Naraparaju ◽  
Chaganti Soujanya ◽  
Sayan Dutta Gupta
Keyword(s):  
Ionic Liquids ◽  
Green Chemistry ◽  
Chemical Reaction ◽  
Supercritical Co2 ◽  
Environmental Problems ◽  
Green Solvents ◽  
Eutectic Mixtures ◽  
Organic Carbonates

: Green chemistry emphasizes designing novel routes to overcome health and environmental problems that occur during a chemical reaction. Green solvents are used in place of conventional solvents that are hazardous to both human and the environment. Solvents like water, ionic liquids, supercritical CO2, biosolvents, organic carbonates, and deep eutectic mixtures can be used as green solvents. The review focuses on the properties, applications, and limitations of these solvents.

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

Molecules ◽  
2020 ◽  
Vol 25 (7) ◽  
pp. 1691 ◽  
Author(s):  
Fred Elhi ◽  
Mikhail Gantman ◽  
Gunnar Nurk ◽  
Peter S. Schulz ◽  
Peter Wasserscheid ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Liquid Mixtures ◽  
Melting Point Depression ◽  
Melting Points ◽  
Thermal Stabilities ◽  
Application Range ◽  
Practical Applications ◽  
Eutectic Mixtures ◽  
Carboxylate Anions ◽  
Pure Compounds

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.

Ternary mixtures of phosphonium ionic liquids + organic solvents + water

2008 ◽  
Vol 80 (6) ◽  
pp. 1325-1335 ◽  
Author(s):  
Shahana A. Chowdhury ◽  
Janet L. Scott ◽  
Douglas R. MacFarlane
Keyword(s):  
Ionic Liquids ◽  
Organic Solvents ◽  
Ternary Phase ◽  
Single Phase ◽  
Ternary Mixtures ◽  
Green Solvents ◽  
Ternary Phase Diagrams ◽  
Tie Lines ◽  
Extraction Processes ◽  
Tie Line

Ionic liquids (ILs) and water are both potentially green solvents that are useful in a variety of extraction processes. This report presents the ternary phase diagrams and tie-line data of trihexyl(tetradecyl)phosphonium dicyanamide [P6,6,6,14][DCA], phosphonium bis(2,4,4-trimethylpentyl)phosphinate [P6,6,6,14][((CH3)3C5H8)2PO2], and 1-ethyl-3-methylimidazolium ethylsulfate [emim][C2H5SO4] ILs in organic solvents (ethanol, acetonitrile, toluene) and water. [P6,6,6,14][DCA] and [P6,6,6,14][((CH3)3C5H8)2PO2] tended to yield emulsions when combined with water and ethanol, while [emim][C2H5SO4] combined with toluene and water provided two clear phases of reasonable viscosity. The compositions of the ternary mixtures were determined to obtain the tie-lines. A noticeable difference was observed for the tie-lines of the same IL (e.g., [P6,6,6,14][DCA]) with different organic solvents (ethanol and acetonitrile) and water mixtures. In all cases, the addition of ethanol eventually produced a single phase.

Properties modification by eutectic formation in mixtures of ionic liquids

RSC Advances ◽  
2015 ◽  
Vol 5 (28) ◽  
pp. 22178-22187 ◽  
Author(s):  
Olga Stolarska ◽  
Ana Soto ◽  
Héctor Rodríguez ◽  
Marcin Smiglak
Keyword(s):  
Surface Tension ◽  
Ionic Liquids ◽  
Physical Properties ◽  
Melting Temperature ◽  
Eutectic Mixtures ◽  
Eutectic Formation

The composition and temperature of three eutectic mixtures of ionic liquids and their physical properties (density, viscosity, and surface tension) are presented. Melting temperature depressions of up to ca. 50 K were found with regard to those of the parent ionic liquids.

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