Deep Eutectic Solvents: Properties and Applications in CO2 Separation

Abstract

Nowadays, many researchers are focused on finding a solution to the problem of global warming. Carbon dioxide is considered to be responsible for the “greenhouse” effect. The largest global emission of industrial CO2 comes from fossil fuel combustion, which makes power plants the perfect point source targets for immediate CO2 emission reductions. A state-of-the-art method for capturing carbon dioxide is chemical absorption using an aqueous solution of alkanolamines, most frequently a 30% wt. solution of monoethanolamine (MEA). Unfortunately, the usage of alkanolamines has a number of drawbacks, such as the corrosive nature of the reaction environment, the loss of the solvent due to its volatility, and a high energy demand at the regeneration step. These problems have driven the search for alternatives to that method, and deep eutectic solvents (DESs) might be a very good substitute. Many types of DESs have thus far been investigated for efficient CO2 capture, and various hydrogen bond donors and acceptors have been used. Deep eutectic solvents that are capable of absorbing carbon dioxide physically and chemically have been reported. Strategies for further CO2 absorption improvement, such as the addition of water, other co-solvents, or metal salts, have been proposed. Within this review, the physical properties of DESs are presented, and their effects on CO2 absorption capacity are discussed in conjunction with the types of HBAs and HBDs and their molar ratios. The practical issues of using DESs for CO2 separation are also described.

Novel hybrid QSPR-GPR approach for modeling of carbon dioxide capture using deep eutectic solvents

“…20 DESs demonstrate promising potential as solvents for the separation of CO 2 . [21][22][23] However, experimental methods have been limited to studying only a small set of potential DES options. This restriction exists because DESs come in a wide range of structures, making it possible to consider around ten combinations that could improve CO 2 capture.…”

Natural Deep Eutectic Solvents as Rust Removal Agents from Lithic and Cellulosic Substrates

“…In recent years, DESs have shown enormous potential for various applications thanks to their ability to solubilize compounds otherwise not soluble in classical organic solvents [20], such as separation and extraction processes [21][22][23][24], synthesis [25][26][27][28], biocatalysis [29,30], CO 2 capture [31][32][33], drug delivery [34][35][36], to mention just a few recent reviews.…”

Utilizing Deep Eutectic Solvents in the Recycle, Recovery, Purification and Miscellaneous Uses of Rare Earth Elements

“…It is often considered that DESs can assist in the development of cleaner processes due to their properties: good thermal and chemical stability, low melting point, easy synthesis, low vapor pressure, and low or practically negligible toxicity, and probably one of the most important characteristics: tunability to meet specific applications [ 7 , 8 , 9 ]. Also, most of them are often biodegradable solvents, showing themselves to be candidates to be considered green solvents [ 10 ].…”

“…In any case, besides its application in solvometallurgical processing, DESs are used in catalysis, electrolytic processes, and other processes, which are applicable to a series of process industries like food, pharmaceutical, cosmetics, oil, gas, etc. [ 9 , 12 , 13 , 14 ].…”