Choline Chloride-based Eutectic Solvents Research Articles

CO2 capture using choline chloride-based eutectic solvents. An experimental and theoretical investigation

Eutectic solvents (ESs) have attracted considerable attention as CO2 absorbents due to their tunable and unique properties. In this study, ESs based on choline chloride (ChCl) as hydrogen bond acceptor were combined with four different hydrogen bond donors (HBDs): urea, formamide, monoethanolamine and 1-aminopropan-2-ol, in different molar ratios. The impact of the primary amino group in HBD, with particular focus on the functional groups present in the vicinity, on the physicochemical and structural properties of the ESs was investigated. The CO2 capture in these ESs was measured. 13C NMR, FTIR and Raman analyses were performed to provide evidence of chemical and structural changes after CO2 capture. Quantum chemical methods were used to investigate the interaction mechanism between the ESs and CO2. The resulting ESs were characterised by measuring their basic physicochemical properties, including melting point, density and viscosity as a function of temperature. A three-parameter correlation equation was proposed to predict the solubility of CO2 in ChCl-based physical absorbents. It is shown that the use of the free volume parameter of ESs can help to identify alternative CO2 absorbents.

Printed environmentally friendly supercapacitors with ionic liquid electrolytes on paper

Environmentally friendly supercapacitors are fabricated using commercial grade aluminum coated paper as a substrate and symmetrical activated carbon electrodes as large area electrodes. Different choline chloride-based eutectic solvents are used as electrolyte. These are inexpensive, environmentally friendly and have a larger operating window compared to that of water electrolytes. As the entire device is printed and the materials used are inexpensive, both small- and large-area power sources can be fabricated to be used in cheap, disposable and recyclable devices. Supercapacitors with different eutectic solvents are measured using cyclic charge–discharge and impedance spectroscopy measurements and compared to one widely used and one “green” imidazolium ionic liquid; EMIM:TFSI and EcoEng 212™, respectively. A mixture of ethylene glycol and choline chloride, Glyceline™, show the highest capacitance and power densities of the electrolytes being tested, including the imidazolium alternatives.

ChemInform Abstract: Choline Chloride Based Eutectic Solvent: An Efficient and Reusable Solvent System for the Synthesis of Primary Amides from Aldehydes and from Nitriles.

Choline chloride: a 2ZnCl2 based deep eutectic solvent was found to be a simple, green, efficient and new solvent system for the preparation of primary amides from aldehydes. The same catalytic system is also applicable for the preparation of amides from nitriles. Good to excellent yields of primary amides were obtained in both these transformations.