Carbon Dioxide Solubilities in Decanoic Acid-Based Hydrophobic Deep Eutectic Solvents

Lawien F Zubeir; Dannie J G P van Osch; Marisa A A Rocha; Fawzi Banat; Maaike C Kroon

doi:10.1021/acs.jced.7b00534

Carbon Dioxide Solubilities in Decanoic Acid-Based Hydrophobic Deep Eutectic Solvents

J Chem Eng Data. 2018 Apr 12;63(4):913-919. doi: 10.1021/acs.jced.7b00534. Epub 2018 Mar 19.

Authors

Lawien F Zubeir¹, Dannie J G P van Osch¹, Marisa A A Rocha¹, Fawzi Banat², Maaike C Kroon^{1

2}

Affiliations

¹ Department of Chemical Engineering and Chemistry, Separation Technology Group, and Department of Chemical Engineering and Chemistry and Institute for Complex Molecular Systems, Laboratory of Physical Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven, The Netherlands.
² Chemical Engineering Department, Khalifa University of Science and Technology, P.O. Box 2533, Abu Dhabi, United Arab Emirates.

Abstract

The solubility of CO₂ in hydrophobic deep eutectic solvents (DESs) has been measured for the first time. Six different hydrophobic DESs are studied in the temperature range from 298 to 323 K and at CO₂ pressures up to 2 MPa. The results are evaluated by comparing the solubility data with existing hydrophilic DESs and currently applied physical solvents and fluorinated ionic liquids. The DESs are prepared by mixing decanoic acid with a quaternary ammonium salt with different halide anions and alkyl chain lengths. The measured CO₂ solubilities are similar to those found in renowned fluorinated ILs, while the heats of CO₂ absorption are in the range of nonpolar solvents. The presented DESs show good potential to be used as CO₂ capture agents.