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Advances in Chemistry
Volume 2018 (2018), Article ID 2675659, 6 pages
Review Article

Review on Carbon Dioxide Absorption by Choline Chloride/Urea Deep Eutectic Solvents

Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, P.O. Box 5825, Doha, Qatar

Correspondence should be addressed to Rima J. Isaifan

Received 20 August 2017; Accepted 10 December 2017; Published 4 January 2018

Academic Editor: Ismail Warad

Copyright © 2018 Rima J. Isaifan and Abdukarem Amhamed. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In the recent past few years, deep eutectic solvents (DESs) were developed sharing similar characteristics to ionic liquids but with more advantageous features related to preparation cost, environmental impact, and efficiency for gas separation processes. Amongst many combinations of DES solvents that have been prepared, reline (choline chloride as the hydrogen bond acceptor mixed with urea as the hydrogen bond donor) was the first DES synthesized and is still the one with the lowest melting point. Choline chloride/urea DES has proven to be a promising solvent as an efficient medium for carbon dioxide capture when compared with amine alone or ionic liquids under the same conditions. This review sheds light on the preparation method, physical and chemical characteristics, and the CO2 absorption capacity of choline chloride/urea DES under different temperatures and pressures reported up to date.