Synthesis, measurement, and correlation study of physico-chemical properties of diethanolamine glycinate ionic liquid as a solvent for CO2 capture units

Amino acid-functionalized ionic liquids (ILs), known as environmentally green non-molecular solvents, have been particular interested in the CO2 capture processes due to their unique physico-chemical prop-erties. Proper development of CO2 capture processes utilizing amino-functionalized ILs, requires the exact determination of the ILs' physico-chemical properties. In this paper, a novel amino acid-functionalized IL, namely diethanolamine glycinate ([DEA][GLY]), was synthesized and then characterized via Nuclear Magnetic Resonance (H NMR) and Fourier Transform Infrared (FT-IR) spectroscopy analysis. The density, dynamic viscosity, and surface tension were experimentally measured over the temperature range of 303.15-323.15 K and a wide verity of IL concentrations from 5 to 25 wt% of IL aqueous solution under atmospheric pressure. Furthermore, simple but reliable correlations with minimum input variables were implemented to model the density, dynamic viscosity, and surface tension data of the binary mixtures of [DEA][GLY] + H2O in terms of temperature and composition. Regarding the statistical criteria, it was indi-cated that the two-descriptor-based models could well describe the effect of temperature in different concentrations of the glycine amino acid-functionalized IL compared with those single temperature -dependent correlations.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

A novel amino acid-functionalized ionic liquid (IL) was synthesized and characterized. Correlation models for density, dynamic viscosity, and surface tension in terms of temperature and composition were established based on experimental measurements.